diff --git a/client/src/app/core/services/data-store.service.ts b/client/src/app/core/services/data-store.service.ts
index 063703330..713e0667a 100644
--- a/client/src/app/core/services/data-store.service.ts
+++ b/client/src/app/core/services/data-store.service.ts
@@ -182,7 +182,7 @@ export class DataStoreService {
         });
     }
 
-    private getCollectionString<T extends BaseModel>(collectionType: ModelConstructor<T> | string): string {
+    private getCollectionString<T extends BaseModel<T>>(collectionType: ModelConstructor<T> | string): string {
         if (typeof collectionType === 'string') {
             return collectionType;
         } else {
@@ -199,7 +199,7 @@ export class DataStoreService {
      * @example: this.DS.get(User, 1)
      * @example: this.DS.get<Countdown>('core/countdown', 2)
      */
-    public get<T extends BaseModel>(collectionType: ModelConstructor<T> | string, id: number): T {
+    public get<T extends BaseModel<T>>(collectionType: ModelConstructor<T> | string, id: number): T {
         const collectionString = this.getCollectionString<T>(collectionType);
 
         const collection: ModelCollection = this.modelStore[collectionString];
@@ -219,7 +219,7 @@ export class DataStoreService {
      * @example: this.DS.getMany(User, [1,2,3,4,5])
      * @example: this.DS.getMany<User>('users/user', [1,2,3,4,5])
      */
-    public getMany<T extends BaseModel>(collectionType: ModelConstructor<T> | string, ids: number[]): T[] {
+    public getMany<T extends BaseModel<T>>(collectionType: ModelConstructor<T> | string, ids: number[]): T[] {
         const collectionString = this.getCollectionString<T>(collectionType);
 
         const collection: ModelCollection = this.modelStore[collectionString];
@@ -242,7 +242,7 @@ export class DataStoreService {
      * @example: this.DS.getAll(User)
      * @example: this.DS.getAll<User>('users/user')
      */
-    public getAll<T extends BaseModel>(collectionType: ModelConstructor<T> | string): T[] {
+    public getAll<T extends BaseModel<T>>(collectionType: ModelConstructor<T> | string): T[] {
         const collectionString = this.getCollectionString<T>(collectionType);
 
         const collection: ModelCollection = this.modelStore[collectionString];
@@ -261,7 +261,7 @@ export class DataStoreService {
      * @return The BaseModel-list corresponding to the filter function
      * @example this.DS.filter<User>(User, myUser => myUser.first_name === "Max")
      */
-    public filter<T extends BaseModel>(
+    public filter<T extends BaseModel<T>>(
         collectionType: ModelConstructor<T> | string,
         callback: (model: T) => boolean
     ): T[] {
diff --git a/client/src/app/shared/components/head-bar/head-bar.component.ts b/client/src/app/shared/components/head-bar/head-bar.component.ts
index 06935dbec..539f4e90f 100644
--- a/client/src/app/shared/components/head-bar/head-bar.component.ts
+++ b/client/src/app/shared/components/head-bar/head-bar.component.ts
@@ -19,7 +19,7 @@ import { Component, OnInit, Input, Output, EventEmitter } from '@angular/core';
  *   plusButton=true
  *   [menuList]=myMenu
  *   (plusButtonClicked)=onPlusButton()
- *   (ellipsisMenuItem)=onEllipsisItem($event)
+ *   (ellipsisMenuItem)=onEllipsisItem($event)>
  * </os-head-bar>
  * ```
  *
diff --git a/client/src/app/shared/components/search-value-selector/search-value-selector.component.html b/client/src/app/shared/components/search-value-selector/search-value-selector.component.html
index d44e9a1d7..288cf7bfd 100644
--- a/client/src/app/shared/components/search-value-selector/search-value-selector.component.html
+++ b/client/src/app/shared/components/search-value-selector/search-value-selector.component.html
@@ -2,10 +2,10 @@
     <mat-select [formControl]="formControl" [placeholder]="listname" [multiple]="multiple" #thisSelector>
         <ngx-mat-select-search [formControl]="filterControl"></ngx-mat-select-search>
         <div *ngIf="!multiple">
-            <mat-option><span translate>None</span></mat-option>
+            <mat-option [value]="null"><span translate>None</span></mat-option>
             <mat-divider></mat-divider>
         </div>
-        <mat-option *ngFor="let selectedItem of filteredItems | async" [value]="selectedItem">
+        <mat-option *ngFor="let selectedItem of filteredItems | async" [value]="selectedItem.id">
             {{selectedItem.getTitle(translate)}}
         </mat-option>
     </mat-select>
diff --git a/client/src/app/shared/components/search-value-selector/search-value-selector.component.ts b/client/src/app/shared/components/search-value-selector/search-value-selector.component.ts
index 246f6b2a3..6fd927660 100644
--- a/client/src/app/shared/components/search-value-selector/search-value-selector.component.ts
+++ b/client/src/app/shared/components/search-value-selector/search-value-selector.component.ts
@@ -1,10 +1,13 @@
 import { Component, OnInit, Input, ViewChild } from '@angular/core';
 import { FormControl, FormGroup } from '@angular/forms';
-import { Subject, BehaviorSubject } from 'rxjs';
+import { Subject, ReplaySubject, BehaviorSubject } from 'rxjs';
 import { MatSelect } from '@angular/material';
 import { takeUntil } from 'rxjs/operators';
 import { Displayable } from '../../models/base/displayable';
 import { TranslateService } from '@ngx-translate/core';
+import { Identifiable } from '../../models/base/identifiable';
+
+type Selectable = Displayable & Identifiable;
 
 /**
  * Reusable Searchable Value Selector
@@ -37,7 +40,7 @@ import { TranslateService } from '@ngx-translate/core';
 })
 export class SearchValueSelectorComponent implements OnInit {
     /**
-     * ngModel variable - Depricated with Angular 7
+     * ngModel variable - Deprecated with Angular 7
      * DO NOT USE: READ AT remove() FUNCTION!
      */
     public myModel = [];
@@ -48,9 +51,9 @@ export class SearchValueSelectorComponent implements OnInit {
     public filterControl = new FormControl();
 
     /**
-     * List of the filtered content, when entering somithing in the search bar
+     * List of the filtered content, when entering something in the search bar
      */
-    public filteredItems: BehaviorSubject<Displayable[]>;
+    public filteredItems: ReplaySubject<Selectable[]> = new ReplaySubject<Selectable[]>(1);
 
     /**
      * Decide if this should be a single or multi-select-field
@@ -62,7 +65,7 @@ export class SearchValueSelectorComponent implements OnInit {
      * The Input List Values
      */
     @Input()
-    public InputListValues: BehaviorSubject<Displayable[]>;
+    public InputListValues: BehaviorSubject<Selectable[]>;
 
     /**
      * Placeholder of the List
@@ -111,7 +114,7 @@ export class SearchValueSelectorComponent implements OnInit {
      * onInit with filter ans subscription on filter
      */
     public ngOnInit(): void {
-        this.filteredItems = this.InputListValues;
+        this.filteredItems.next(this.InputListValues.getValue());
         // listen to value changes
         this.filterControl.valueChanges.pipe(takeUntil(this._onDestroy)).subscribe(() => {
             this.filterItems();
@@ -152,7 +155,7 @@ export class SearchValueSelectorComponent implements OnInit {
      * places, but can't reflect the changes in both places. Until this can be done this will be unused code
      * @param item the selected item to be removed
      */
-    public remove(item: Displayable): void {
+    public remove(item: Selectable): void {
         const myArr = this.thisSelector.value;
         const index = myArr.indexOf(item, 0);
         // my model was the form according to fix
diff --git a/client/src/app/shared/models/base/base-model.ts b/client/src/app/shared/models/base/base-model.ts
index ddc7fab76..20d59de10 100644
--- a/client/src/app/shared/models/base/base-model.ts
+++ b/client/src/app/shared/models/base/base-model.ts
@@ -2,15 +2,18 @@ import { OpenSlidesComponent } from 'app/openslides.component';
 import { Deserializable } from './deserializable';
 import { CollectionStringModelMapperService } from '../../../core/services/collectionStringModelMapper.service';
 import { Displayable } from './displayable';
+import { Identifiable } from './identifiable';
 
-export interface ModelConstructor<T extends BaseModel> {
+export interface ModelConstructor<T extends BaseModel<T>> {
     new (...args: any[]): T;
 }
 
 /**
  * Abstract parent class to set rules and functions for all models.
+ * When inherit from this class, give the subclass as the type. E.g. `class Motion extends BaseModel<Motion>`
  */
-export abstract class BaseModel extends OpenSlidesComponent implements Deserializable, Displayable {
+export abstract class BaseModel<T = object> extends OpenSlidesComponent
+    implements Deserializable, Displayable, Identifiable {
     /**
      * Register the collection string to the type.
      * @param collectionString
@@ -57,6 +60,10 @@ export abstract class BaseModel extends OpenSlidesComponent implements Deseriali
         });
     }
 
+    public patchValues(update: Partial<T>): void {
+        Object.assign(this, update);
+    }
+
     public abstract getTitle(): string;
 
     public getListTitle(): string {
diff --git a/client/src/app/shared/models/base/deserializable.ts b/client/src/app/shared/models/base/deserializable.ts
index 7d2cfd844..503d8ad5c 100644
--- a/client/src/app/shared/models/base/deserializable.ts
+++ b/client/src/app/shared/models/base/deserializable.ts
@@ -13,5 +13,5 @@ export interface Deserializable {
      * should be used to assign JSON values to the object itself.
      * @param input
      */
-    deserialize(input: any): void;
+    deserialize(input: object): void;
 }
diff --git a/client/src/app/shared/models/base/identifiable.ts b/client/src/app/shared/models/base/identifiable.ts
new file mode 100644
index 000000000..962b8184f
--- /dev/null
+++ b/client/src/app/shared/models/base/identifiable.ts
@@ -0,0 +1,9 @@
+/**
+ * Every object implementing this interface has an id.
+ */
+export interface Identifiable {
+    /**
+     * The objects id.
+     */
+    id: number;
+}
diff --git a/client/src/app/shared/models/base/projectable-base-model.ts b/client/src/app/shared/models/base/projectable-base-model.ts
index fc10e11d3..afc57c66e 100644
--- a/client/src/app/shared/models/base/projectable-base-model.ts
+++ b/client/src/app/shared/models/base/projectable-base-model.ts
@@ -1,7 +1,7 @@
 import { BaseModel } from './base-model';
 import { Projectable } from './projectable';
 
-export abstract class ProjectableBaseModel extends BaseModel implements Projectable {
+export abstract class ProjectableBaseModel extends BaseModel<ProjectableBaseModel> implements Projectable {
     protected constructor(collectionString: string, input?: any) {
         super(collectionString, input);
     }
diff --git a/client/src/app/shared/models/core/chat-message.ts b/client/src/app/shared/models/core/chat-message.ts
index 146186195..f9e377298 100644
--- a/client/src/app/shared/models/core/chat-message.ts
+++ b/client/src/app/shared/models/core/chat-message.ts
@@ -4,7 +4,7 @@ import { BaseModel } from '../base/base-model';
  * Representation of chat messages.
  * @ignore
  */
-export class ChatMessage extends BaseModel {
+export class ChatMessage extends BaseModel<ChatMessage> {
     public id: number;
     public message: string;
     public timestamp: string; // TODO: Type for timestamp
diff --git a/client/src/app/shared/models/core/projector.ts b/client/src/app/shared/models/core/projector.ts
index d2b692469..f2200aa61 100644
--- a/client/src/app/shared/models/core/projector.ts
+++ b/client/src/app/shared/models/core/projector.ts
@@ -4,7 +4,7 @@ import { BaseModel } from '../base/base-model';
  * Representation of a projector. Has the nested property "projectiondefaults"
  * @ignore
  */
-export class Projector extends BaseModel {
+export class Projector extends BaseModel<Projector> {
     public id: number;
     public elements: Object;
     public scale: number;
diff --git a/client/src/app/shared/models/core/tag.ts b/client/src/app/shared/models/core/tag.ts
index 44e0fd75a..b8e05d918 100644
--- a/client/src/app/shared/models/core/tag.ts
+++ b/client/src/app/shared/models/core/tag.ts
@@ -4,7 +4,7 @@ import { BaseModel } from '../base/base-model';
  * Representation of a tag.
  * @ignore
  */
-export class Tag extends BaseModel {
+export class Tag extends BaseModel<Tag> {
     public id: number;
     public name: string;
 
diff --git a/client/src/app/shared/models/motions/category.ts b/client/src/app/shared/models/motions/category.ts
index 978ddf4ad..7dfee4f21 100644
--- a/client/src/app/shared/models/motions/category.ts
+++ b/client/src/app/shared/models/motions/category.ts
@@ -4,7 +4,7 @@ import { BaseModel } from '../base/base-model';
  * Representation of a motion category. Has the nested property "File"
  * @ignore
  */
-export class Category extends BaseModel {
+export class Category extends BaseModel<Category> {
     public id: number;
     public name: string;
     public prefix: string;
@@ -16,13 +16,6 @@ export class Category extends BaseModel {
     public getTitle(): string {
         return this.prefix + ' - ' + this.name;
     }
-
-    /**
-     * update the values of the motion with new values
-     */
-    public patchValues(update: object): void {
-        Object.assign(this, update);
-    }
 }
 
 BaseModel.registerCollectionElement('motions/category', Category);
diff --git a/client/src/app/shared/models/motions/motion-change-reco.ts b/client/src/app/shared/models/motions/motion-change-reco.ts
index a562f7b36..6f2f24393 100644
--- a/client/src/app/shared/models/motions/motion-change-reco.ts
+++ b/client/src/app/shared/models/motions/motion-change-reco.ts
@@ -4,7 +4,7 @@ import { BaseModel } from '../base/base-model';
  * Representation of a motion change recommendation.
  * @ignore
  */
-export class MotionChangeReco extends BaseModel {
+export class MotionChangeReco extends BaseModel<MotionChangeReco> {
     public id: number;
     public motion_version_id: number;
     public rejected: boolean;
diff --git a/client/src/app/shared/models/motions/motion-comment-section.ts b/client/src/app/shared/models/motions/motion-comment-section.ts
index 24fff9c02..8217db479 100644
--- a/client/src/app/shared/models/motions/motion-comment-section.ts
+++ b/client/src/app/shared/models/motions/motion-comment-section.ts
@@ -4,7 +4,7 @@ import { BaseModel } from '../base/base-model';
  * Representation of a motion category. Has the nested property "File"
  * @ignore
  */
-export class MotionCommentSection extends BaseModel {
+export class MotionCommentSection extends BaseModel<MotionCommentSection> {
     public id: number;
     public name: string;
     public read_groups_id: number[];
diff --git a/client/src/app/shared/models/motions/motion.ts b/client/src/app/shared/models/motions/motion.ts
index 35cf26909..3f1427870 100644
--- a/client/src/app/shared/models/motions/motion.ts
+++ b/client/src/app/shared/models/motions/motion.ts
@@ -44,13 +44,6 @@ export class Motion extends AgendaBaseModel {
         super('motions/motion', 'Motion', input);
     }
 
-    /**
-     * update the values of the motion with new values
-     */
-    public patchValues(update: object): void {
-        Object.assign(this, update);
-    }
-
     /**
      * returns the motion submitters userIDs
      */
diff --git a/client/src/app/shared/models/motions/workflow.ts b/client/src/app/shared/models/motions/workflow.ts
index 8e8f30ac7..5e8de65cd 100644
--- a/client/src/app/shared/models/motions/workflow.ts
+++ b/client/src/app/shared/models/motions/workflow.ts
@@ -5,7 +5,7 @@ import { WorkflowState } from './workflow-state';
  * Representation of a motion workflow. Has the nested property 'states'
  * @ignore
  */
-export class Workflow extends BaseModel {
+export class Workflow extends BaseModel<Workflow> {
     public id: number;
     public name: string;
     public states: WorkflowState[];
diff --git a/client/src/app/shared/models/users/group.ts b/client/src/app/shared/models/users/group.ts
index 4b52724d6..fdca2c193 100644
--- a/client/src/app/shared/models/users/group.ts
+++ b/client/src/app/shared/models/users/group.ts
@@ -4,7 +4,7 @@ import { BaseModel } from '../base/base-model';
  * Representation of user group.
  * @ignore
  */
-export class Group extends BaseModel {
+export class Group extends BaseModel<Group> {
     public id: number;
     public name: string;
     public permissions: string[];
diff --git a/client/src/app/shared/models/users/personal-note.ts b/client/src/app/shared/models/users/personal-note.ts
index a9a0bd434..e9cd607ed 100644
--- a/client/src/app/shared/models/users/personal-note.ts
+++ b/client/src/app/shared/models/users/personal-note.ts
@@ -4,7 +4,7 @@ import { BaseModel } from '../base/base-model';
  * Representation of users personal note.
  * @ignore
  */
-export class PersonalNote extends BaseModel {
+export class PersonalNote extends BaseModel<PersonalNote> {
     public id: number;
     public user_id: number;
     public notes: Object;
diff --git a/client/src/app/site/agenda/models/view-item.ts b/client/src/app/site/agenda/models/view-item.ts
index cf221d8b6..b1731ea67 100644
--- a/client/src/app/site/agenda/models/view-item.ts
+++ b/client/src/app/site/agenda/models/view-item.ts
@@ -1,6 +1,5 @@
 import { BaseViewModel } from '../../base/base-view-model';
 import { Item } from '../../../shared/models/agenda/item';
-import { BaseModel } from '../../../shared/models/base/base-model';
 import { AgendaBaseModel } from '../../../shared/models/base/agenda-base-model';
 
 export class ViewItem extends BaseViewModel {
@@ -46,8 +45,8 @@ export class ViewItem extends BaseViewModel {
         }
     }
 
-    public updateValues(update: BaseModel): void {
-        if (update instanceof Item && this.id === update.id) {
+    public updateValues(update: Item): void {
+        if (this.id === update.id) {
             this._item = update;
         }
     }
diff --git a/client/src/app/site/agenda/services/agenda-repository.service.ts b/client/src/app/site/agenda/services/agenda-repository.service.ts
index db79fff72..fb01cfd70 100644
--- a/client/src/app/site/agenda/services/agenda-repository.service.ts
+++ b/client/src/app/site/agenda/services/agenda-repository.service.ts
@@ -49,7 +49,7 @@ export class AgendaRepositoryService extends BaseRepository<ViewItem, Item> {
      *
      * TODO: used over not-yet-existing detail view
      */
-    public update(item: Item, viewUser: ViewItem): Observable<Item> {
+    public update(item: Partial<Item>, viewUser: ViewItem): Observable<Item> {
         return null;
     }
 
@@ -67,7 +67,7 @@ export class AgendaRepositoryService extends BaseRepository<ViewItem, Item> {
      *
      * TODO: used over not-yet-existing detail view
      */
-    public create(item: Item, viewItem: ViewItem): Observable<Item> {
+    public create(item: Item): Observable<Item> {
         return null;
     }
 
diff --git a/client/src/app/site/assignments/models/view-assignment.ts b/client/src/app/site/assignments/models/view-assignment.ts
index 32373a663..561569136 100644
--- a/client/src/app/site/assignments/models/view-assignment.ts
+++ b/client/src/app/site/assignments/models/view-assignment.ts
@@ -10,6 +10,10 @@ export class ViewAssignment extends BaseViewModel {
     private _agendaItem: Item;
     private _tags: Tag[];
 
+    public get id(): number {
+        return this._assignment ? this._assignment.id : null;
+    }
+
     public get assignment(): Assignment {
         return this._assignment;
     }
diff --git a/client/src/app/site/assignments/services/assignment-repository.service.ts b/client/src/app/site/assignments/services/assignment-repository.service.ts
index 3e8cca80e..98a7ffb16 100644
--- a/client/src/app/site/assignments/services/assignment-repository.service.ts
+++ b/client/src/app/site/assignments/services/assignment-repository.service.ts
@@ -25,7 +25,7 @@ export class AssignmentRepositoryService extends BaseRepository<ViewAssignment,
         super(DS, Assignment, [User, Item, Tag]);
     }
 
-    public update(assignment: Assignment, viewAssignment: ViewAssignment): Observable<Assignment> {
+    public update(assignment: Partial<Assignment>, viewAssignment: ViewAssignment): Observable<Assignment> {
         return null;
     }
 
@@ -33,7 +33,7 @@ export class AssignmentRepositoryService extends BaseRepository<ViewAssignment,
         return null;
     }
 
-    public create(assignment: Assignment, viewAssignment: ViewAssignment): Observable<Assignment> {
+    public create(assignment: Assignment): Observable<Assignment> {
         return null;
     }
 
diff --git a/client/src/app/site/base/base-repository.ts b/client/src/app/site/base/base-repository.ts
index b5668404c..6ff8c2a6d 100644
--- a/client/src/app/site/base/base-repository.ts
+++ b/client/src/app/site/base/base-repository.ts
@@ -75,7 +75,7 @@ export abstract class BaseRepository<V extends BaseViewModel, M extends BaseMode
      * @param update the update that should be created
      * @param viewModel the view model that the update is based on
      */
-    public abstract update(update: M, viewModel: V): Observable<M>;
+    public abstract update(update: Partial<M>, viewModel: V): Observable<M>;
 
     /**
      * Deletes a given Model
@@ -90,7 +90,7 @@ export abstract class BaseRepository<V extends BaseViewModel, M extends BaseMode
      * @param viewModel the view model that the update is based on
      * TODO: remove the viewModel
      */
-    public abstract create(update: M, viewModel: V): Observable<M>;
+    public abstract create(update: M): Observable<M>;
 
     /**
      * Creates a view model out of a base model.
diff --git a/client/src/app/site/base/base-view-model.ts b/client/src/app/site/base/base-view-model.ts
index 89ae92895..d223e416d 100644
--- a/client/src/app/site/base/base-view-model.ts
+++ b/client/src/app/site/base/base-view-model.ts
@@ -1,10 +1,16 @@
 import { BaseModel } from '../../shared/models/base/base-model';
 import { Displayable } from '../../shared/models/base/displayable';
+import { Identifiable } from '../../shared/models/base/identifiable';
 
 /**
  * Base class for view models. alls view models should have titles.
  */
-export abstract class BaseViewModel implements Displayable {
+export abstract class BaseViewModel implements Displayable, Identifiable {
+    /**
+     * Force children to have an id.
+     */
+    public abstract id: number;
+
     public abstract updateValues(update: BaseModel): void;
 
     public abstract getTitle(): string;
diff --git a/client/src/app/site/mediafiles/models/view-mediafile.ts b/client/src/app/site/mediafiles/models/view-mediafile.ts
index f08989c17..725cf2c94 100644
--- a/client/src/app/site/mediafiles/models/view-mediafile.ts
+++ b/client/src/app/site/mediafiles/models/view-mediafile.ts
@@ -1,12 +1,15 @@
 import { BaseViewModel } from '../../base/base-view-model';
 import { Mediafile } from '../../../shared/models/mediafiles/mediafile';
 import { User } from '../../../shared/models/users/user';
-import { BaseModel } from '../../../shared/models/base/base-model';
 
 export class ViewMediafile extends BaseViewModel {
     private _mediafile: Mediafile;
     private _uploader: User;
 
+    public get id(): number {
+        return this._mediafile ? this._mediafile.id : null;
+    }
+
     public get mediafile(): Mediafile {
         return this._mediafile;
     }
@@ -49,11 +52,9 @@ export class ViewMediafile extends BaseViewModel {
         return this.title;
     }
 
-    public updateValues(update: BaseModel): void {
-        if (update instanceof Mediafile) {
-            if (this.mediafile.id === update.id) {
-                this._mediafile = update;
-            }
+    public updateValues(update: Mediafile): void {
+        if (this.mediafile.id === update.id) {
+            this._mediafile = update;
         }
     }
 }
diff --git a/client/src/app/site/mediafiles/services/mediafile-repository.service.ts b/client/src/app/site/mediafiles/services/mediafile-repository.service.ts
index 5e3218f64..c4a03adee 100644
--- a/client/src/app/site/mediafiles/services/mediafile-repository.service.ts
+++ b/client/src/app/site/mediafiles/services/mediafile-repository.service.ts
@@ -27,7 +27,7 @@ export class MediafileRepositoryService extends BaseRepository<ViewMediafile, Me
      *
      * TODO: used over not-yet-existing detail view
      */
-    public update(file: Mediafile, viewFile: ViewMediafile): Observable<Mediafile> {
+    public update(file: Partial<Mediafile>, viewFile: ViewMediafile): Observable<Mediafile> {
         return null;
     }
 
@@ -45,7 +45,7 @@ export class MediafileRepositoryService extends BaseRepository<ViewMediafile, Me
      *
      * TODO: used over not-yet-existing detail view
      */
-    public create(file: Mediafile, viewFile: ViewMediafile): Observable<Mediafile> {
+    public create(file: Mediafile): Observable<Mediafile> {
         return null;
     }
 
diff --git a/client/src/app/site/motions/components/category-list/category-list.component.ts b/client/src/app/site/motions/components/category-list/category-list.component.ts
index 79d84db62..64f5ae8c6 100644
--- a/client/src/app/site/motions/components/category-list/category-list.component.ts
+++ b/client/src/app/site/motions/components/category-list/category-list.component.ts
@@ -87,9 +87,9 @@ export class CategoryListComponent extends BaseComponent implements OnInit, OnDe
      */
     private saveCategory(viewCategory: ViewCategory): void {
         if (this.repo.osInDataStore(viewCategory)) {
-            this.repo.create(viewCategory).subscribe();
+            this.repo.update(viewCategory.category).subscribe();
         } else {
-            this.repo.update(viewCategory).subscribe();
+            this.repo.create(viewCategory.category, viewCategory).subscribe();
         }
         viewCategory.edit = false;
     }
diff --git a/client/src/app/site/motions/components/motion-detail/motion-detail.component.html b/client/src/app/site/motions/components/motion-detail/motion-detail.component.html
index 9b87d4cd4..501de114e 100644
--- a/client/src/app/site/motions/components/motion-detail/motion-detail.component.html
+++ b/client/src/app/site/motions/components/motion-detail/motion-detail.component.html
@@ -148,7 +148,8 @@
         <div *ngIf="motion && motion.submitters || editMotion">
             <div *ngIf="editMotion && newMotion">
                 <div *ngIf="motion && editMotion">
-                    <os-search-value-selector ngDefaultControl [form]="metaInfoForm" [formControl]="this.metaInfoForm.get('submitters')" [multiple]="true" listname="Submitter" [InputListValues]="this.submitterObserver"></os-search-value-selector>
+                    <os-search-value-selector ngDefaultControl [form]="metaInfoForm" [formControl]="this.metaInfoForm.get('submitters_id')"
+                        [multiple]="true" listname="Submitter" [InputListValues]="this.submitterObserver"></os-search-value-selector>
                 </div>
             </div>
             <div *ngIf="!editMotion || !newMotion">
@@ -164,7 +165,8 @@
             <!-- print all motion supporters -->
             <div *ngIf="editMotion">
                 <div *ngIf="motion && editMotion">
-                    <os-search-value-selector ngDefaultControl [form]="metaInfoForm" [formControl]="this.metaInfoForm.get('supporters_id')" [multiple]="true" listname="Supporter" [InputListValues]="this.supporterObserver"></os-search-value-selector>
+                    <os-search-value-selector ngDefaultControl [form]="metaInfoForm" [formControl]="this.metaInfoForm.get('supporters_id')"
+                        [multiple]="true" listname="Supporter" [InputListValues]="this.supporterObserver"></os-search-value-selector>
                 </div>
             </div>
             <div *ngIf="!editMotion && motion.hasSupporters()">
@@ -222,7 +224,8 @@
                 {{motion.category}}
             </div>
             <div *ngIf="editMotion">
-                <os-search-value-selector ngDefaultControl [form]="metaInfoForm" [formControl]="this.metaInfoForm.get('category_id')" [multiple]="false" listname="Category" [InputListValues]="this.categoryObserver"></os-search-value-selector>
+                <os-search-value-selector ngDefaultControl [form]="metaInfoForm" [formControl]="this.metaInfoForm.get('category_id')"
+                    [multiple]="false" listname="Category" [InputListValues]="this.categoryObserver"></os-search-value-selector>
             </div>
         </div>
 
diff --git a/client/src/app/site/motions/components/motion-detail/motion-detail.component.ts b/client/src/app/site/motions/components/motion-detail/motion-detail.component.ts
index 579d443d4..623512b4b 100644
--- a/client/src/app/site/motions/components/motion-detail/motion-detail.component.ts
+++ b/client/src/app/site/motions/components/motion-detail/motion-detail.component.ts
@@ -10,8 +10,9 @@ import { MotionRepositoryService } from '../../services/motion-repository.servic
 import { ViewMotion } from '../../models/view-motion';
 import { User } from '../../../../shared/models/users/user';
 import { DataStoreService } from '../../../../core/services/data-store.service';
-import { BehaviorSubject } from 'rxjs';
 import { TranslateService } from '@ngx-translate/core';
+import { Motion } from '../../../../shared/models/motions/motion';
+import { BehaviorSubject } from 'rxjs';
 
 /**
  * Component for the motion detail view
@@ -122,7 +123,7 @@ export class MotionDetailComponent extends BaseComponent implements OnInit {
         // Initial Filling of the Subjects
         this.submitterObserver = new BehaviorSubject(DS.getAll(User));
         this.supporterObserver = new BehaviorSubject(DS.getAll(User));
-        this.categoryObserver = new BehaviorSubject(this.DS.getAll(Category));
+        this.categoryObserver = new BehaviorSubject(DS.getAll(Category));
 
         // Make sure the subjects are updated, when a new Model for the type arrives
         this.DS.changeObservable.subscribe(newModel => {
@@ -141,9 +142,9 @@ export class MotionDetailComponent extends BaseComponent implements OnInit {
      */
     public patchForm(formMotion: ViewMotion): void {
         this.metaInfoForm.patchValue({
-            category_id: formMotion.category,
-            supporters_id: formMotion.supporters,
-            submitters: formMotion.submitters,
+            category_id: formMotion.categoryId,
+            supporters_id: formMotion.supporterIds,
+            submitters_id: formMotion.submitterIds,
             state_id: formMotion.stateId,
             recommendation_id: formMotion.recommendationId,
             identifier: formMotion.identifier,
@@ -167,7 +168,7 @@ export class MotionDetailComponent extends BaseComponent implements OnInit {
             category_id: [''],
             state_id: [''],
             recommendation_id: [''],
-            submitters: [''],
+            submitters_id: [''],
             supporters_id: [''],
             origin: ['']
         });
@@ -191,12 +192,15 @@ export class MotionDetailComponent extends BaseComponent implements OnInit {
      */
     public saveMotion(): void {
         const newMotionValues = { ...this.metaInfoForm.value, ...this.contentForm.value };
+        const fromForm = new Motion();
+        fromForm.deserialize(newMotionValues);
+
         if (this.newMotion) {
-            this.repo.create(newMotionValues).subscribe(response => {
+            this.repo.create(fromForm).subscribe(response => {
                 this.router.navigate(['./motions/' + response.id]);
             });
         } else {
-            this.repo.update(newMotionValues, this.motionCopy).subscribe();
+            this.repo.update(fromForm, this.motionCopy).subscribe();
         }
     }
 
diff --git a/client/src/app/site/motions/models/view-motion.ts b/client/src/app/site/motions/models/view-motion.ts
index c1832f5f0..92d2addc1 100644
--- a/client/src/app/site/motions/models/view-motion.ts
+++ b/client/src/app/site/motions/models/view-motion.ts
@@ -6,7 +6,6 @@ import { WorkflowState } from '../../../shared/models/motions/workflow-state';
 import { BaseModel } from '../../../shared/models/base/base-model';
 import { BaseViewModel } from '../../base/base-view-model';
 import { TranslateService } from '@ngx-translate/core';
-
 /**
  * Motion class for the View
  *
@@ -58,10 +57,18 @@ export class ViewMotion extends BaseViewModel {
         return this._submitters;
     }
 
+    public get submitterIds(): number[] {
+        return this.motion ? this.motion.submitters_id : null;
+    }
+
     public get supporters(): User[] {
         return this._supporters;
     }
 
+    public get supporterIds(): number[] {
+        return this.motion ? this.motion.supporters_id : null;
+    }
+
     public get workflow(): Workflow {
         return this._workflow;
     }
@@ -101,6 +108,32 @@ export class ViewMotion extends BaseViewModel {
         return this.state && this.workflow ? this.state.getNextStates(this.workflow) : null;
     }
 
+    public set supporters(users: User[]) {
+        const userIDArr: number[] = [];
+        users.forEach(user => {
+            userIDArr.push(user.id);
+        });
+        this._supporters = users;
+        this._motion.supporters_id = userIDArr;
+    }
+
+    public set submitters(users: User[]) {
+        // For the newer backend with weight:
+        // const submitterArr: MotionSubmitter[] = []
+        // users.forEach(user => {
+        //      const motionSub = new MotionSubmitter();
+        //     submitterArr.push(motionSub);
+        // });
+        // this._motion.submitters = submitterArr;
+        this._submitters = users;
+        const submitterIDArr: number[] = [];
+        // for the older backend:
+        users.forEach(user => {
+            submitterIDArr.push(user.id);
+        });
+        this._motion.submitters_id = submitterIDArr;
+    }
+
     public constructor(
         motion?: Motion,
         category?: Category,
@@ -129,18 +162,32 @@ export class ViewMotion extends BaseViewModel {
      */
     public updateValues(update: BaseModel): void {
         if (update instanceof Workflow) {
-            if (this.motion && update.id === this.motion.workflow_id) {
-                this._workflow = update as Workflow;
-            }
+            this.updateWorkflow(update as Workflow);
         } else if (update instanceof Category) {
-            if (this.motion && update.id === this.motion.category_id) {
-                this._category = update as Category;
-            }
+            this.updateCategory(update as Category);
         }
         // TODO: There is no way (yet) to add Submitters to a motion
         //       Thus, this feature could not be tested
     }
 
+    /**
+     * Updates the Category
+     */
+    public updateCategory(update: Category): void {
+        if (this.motion && update.id === this.motion.category_id) {
+            this._category = update as Category;
+        }
+    }
+
+    /**
+     * updates the Workflow
+     */
+    public updateWorkflow(update: Workflow): void {
+        if (this.motion && update.id === this.motion.workflow_id) {
+            this._workflow = update as Workflow;
+        }
+    }
+
     public hasSupporters(): boolean {
         return !!(this.supporters && this.supporters.length > 0);
     }
diff --git a/client/src/app/site/motions/services/category-repository.service.ts b/client/src/app/site/motions/services/category-repository.service.ts
index 078e5ccf1..37ada08d9 100644
--- a/client/src/app/site/motions/services/category-repository.service.ts
+++ b/client/src/app/site/motions/services/category-repository.service.ts
@@ -34,26 +34,17 @@ export class CategoryRepositoryService extends BaseRepository<ViewCategory, Cate
         return new ViewCategory(category);
     }
 
-    public create(update: object, viewCategory?: ViewCategory): Observable<any> {
-        const categories = this.DS.getAll(Category);
-        const categoryIds: number[] = [];
-        if (update instanceof Category) {
-            viewCategory = new ViewCategory(update);
-        }
-        if (update instanceof ViewCategory) {
-            viewCategory = update;
-        }
-        categories.forEach(category => {
-            categoryIds.push(category.id);
-        });
-        if (viewCategory.id in categoryIds) {
+    public create(update: Category, viewCategory?: ViewCategory): Observable<any> {
+        console.log('update: ', update);
+        console.log('viewCategory: ', viewCategory);
+        if (this.osInDataStore(viewCategory)) {
             return this.update(update, viewCategory);
         } else {
             return this.dataSend.saveModel(viewCategory.category);
         }
     }
 
-    public update(update: object, viewCategory?: ViewCategory): Observable<any> {
+    public update(update: Category, viewCategory?: ViewCategory): Observable<any> {
         let updateCategory: Category;
         if (viewCategory) {
             updateCategory = viewCategory.category;
diff --git a/client/src/app/site/motions/services/motion-repository.service.ts b/client/src/app/site/motions/services/motion-repository.service.ts
index 17ba67dff..b4cbfcc46 100644
--- a/client/src/app/site/motions/services/motion-repository.service.ts
+++ b/client/src/app/site/motions/services/motion-repository.service.ts
@@ -65,8 +65,8 @@ export class MotionRepositoryService extends BaseRepository<ViewMotion, Motion>
      * @param viewMotion The View Motion. If not present, a new motion will be created
      * TODO: Remove the viewMotion and make it actually distignuishable from save()
      */
-    public create(update: any, viewMotion?: ViewMotion): Observable<any> {
-        return this.update(update, viewMotion);
+    public create(motion: Motion): Observable<any> {
+        return this.dataSend.saveModel(motion);
     }
 
     /**
@@ -78,46 +78,10 @@ export class MotionRepositoryService extends BaseRepository<ViewMotion, Motion>
      * @param update the form data containing the update values
      * @param viewMotion The View Motion. If not present, a new motion will be created
      */
-    public update(update: any, viewMotion?: ViewMotion): Observable<any> {
-        let updateMotion: Motion;
-        if (viewMotion) {
-            // implies that an existing motion was updated
-            updateMotion = viewMotion.motion;
-        } else {
-            // implies that a new motion was created
-            updateMotion = new Motion();
-        }
-        // submitters: User[] -> submitter: MotionSubmitter[]
-        const submitters = update.submitters as User[];
-        // The server doesn't really accept MotionSubmitter arrays on create.
-        // We simply need to send an number[] on create.
-        // MotionSubmitter[] should be send on update
-        update.submitters = undefined;
-        const submitterIds: number[] = [];
-        if (submitters.length > 0) {
-            submitters.forEach(submitter => {
-                submitterIds.push(submitter.id);
-            });
-        }
-        update.submitters_id = submitterIds;
-        // supporters[]: User -> supporters_id: number[];
-        const supporters = update.supporters_id as User[];
-        const supporterIds: number[] = [];
-        if (supporters.length > 0) {
-            supporters.forEach(supporter => {
-                supporterIds.push(supporter.id);
-            });
-        }
-        update.supporters_id = supporterIds;
-        // category_id: Category -> category_id: number;
-        const category = update.category_id as Category;
-        update.category_id = undefined;
-        if (category) {
-            update.category_id = category.id;
-        }
-        // Update the Motion
-        updateMotion.patchValues(update);
-        return this.dataSend.saveModel(updateMotion);
+    public update(update: Partial<Motion>, viewMotion: ViewMotion): Observable<any> {
+        const motion = viewMotion.motion;
+        motion.patchValues(update);
+        return this.dataSend.saveModel(motion);
     }
 
     /**
diff --git a/client/src/app/site/settings/models/view-config.ts b/client/src/app/site/settings/models/view-config.ts
index a531bf758..1e8714cf0 100644
--- a/client/src/app/site/settings/models/view-config.ts
+++ b/client/src/app/site/settings/models/view-config.ts
@@ -1,5 +1,4 @@
 import { BaseViewModel } from '../../base/base-view-model';
-import { BaseModel } from '../../../shared/models/base/base-model';
 import { Config } from '../../../shared/models/core/config';
 
 export class ViewConfig extends BaseViewModel {
@@ -30,9 +29,7 @@ export class ViewConfig extends BaseViewModel {
         return this.key;
     }
 
-    public updateValues(update: BaseModel): void {
-        if (update instanceof Config && this.id === update.id) {
-            this._config = update;
-        }
+    public updateValues(update: Config): void {
+        this._config = update;
     }
 }
diff --git a/client/src/app/site/settings/services/config-repository.service.ts b/client/src/app/site/settings/services/config-repository.service.ts
index de99c5a6f..7580b07ea 100644
--- a/client/src/app/site/settings/services/config-repository.service.ts
+++ b/client/src/app/site/settings/services/config-repository.service.ts
@@ -27,7 +27,7 @@ export class ConfigRepositoryService extends BaseRepository<ViewConfig, Config>
      *
      * TODO: used over not-yet-existing detail view
      */
-    public update(config: Config, viewConfig: ViewConfig): Observable<Config> {
+    public update(config: Partial<Config>, viewConfig: ViewConfig): Observable<Config> {
         return null;
     }
 
@@ -47,7 +47,7 @@ export class ConfigRepositoryService extends BaseRepository<ViewConfig, Config>
      *
      * Function exists solely to correctly implement {@link BaseRepository}
      */
-    public create(config: Config, viewConfig: ViewConfig): Observable<Config> {
+    public create(config: Config): Observable<Config> {
         return null;
     }
 
diff --git a/client/src/app/site/users/models/view-user.ts b/client/src/app/site/users/models/view-user.ts
index 1eabb7864..739c32f8b 100644
--- a/client/src/app/site/users/models/view-user.ts
+++ b/client/src/app/site/users/models/view-user.ts
@@ -7,6 +7,10 @@ export class ViewUser extends BaseViewModel {
     private _user: User;
     private _groups: Group[];
 
+    public get id(): number {
+        return this._user ? this._user.id : null;
+    }
+
     public get user(): User {
         return this._user;
     }
@@ -47,22 +51,30 @@ export class ViewUser extends BaseViewModel {
         console.log('replace group - not yet implemented, ', newGroup);
     }
 
+    public updateValues(update: BaseModel): void {
+        if (update instanceof Group) {
+            this.updateGroup(update as Group);
+        }
+        if (update instanceof User) {
+            this.updateUser(update as User);
+        }
+    }
+
+    public updateGroup(update: Group): void {
+        if (this.user && this.user.groups_id) {
+            if (this.user.containsGroupId(update.id)) {
+                this.replaceGroup(update);
+            }
+        }
+    }
     /**
      * Updates values. Triggered through observables.
      *
      * @param update a new User or Group
      */
-    public updateValues(update: BaseModel): void {
-        if (update instanceof User) {
-            if (this.user.id === update.id) {
-                this._user = update;
-            }
-        } else if (update instanceof Group) {
-            if (this.user && this.user.groups_id) {
-                if (this.user.containsGroupId(update.id)) {
-                    this.replaceGroup(update);
-                }
-            }
+    public updateUser(update: User): void {
+        if (this.user.id === update.id) {
+            this._user = update;
         }
     }
 }
diff --git a/client/src/app/site/users/services/user-repository.service.ts b/client/src/app/site/users/services/user-repository.service.ts
index f9dfc1b23..83adfa13e 100644
--- a/client/src/app/site/users/services/user-repository.service.ts
+++ b/client/src/app/site/users/services/user-repository.service.ts
@@ -28,7 +28,7 @@ export class UserRepositoryService extends BaseRepository<ViewUser, User> {
      *
      * TODO: used over not-yet-existing detail view
      */
-    public update(user: User, viewUser: ViewUser): Observable<User> {
+    public update(user: Partial<User>, viewUser: ViewUser): Observable<User> {
         return null;
     }
 
@@ -46,7 +46,7 @@ export class UserRepositoryService extends BaseRepository<ViewUser, User> {
      *
      * TODO: used over not-yet-existing detail view
      */
-    public create(user: User, viewFile: ViewUser): Observable<User> {
+    public create(user: User): Observable<User> {
         return null;
     }