diff --git a/client/src/app/shared/models/agenda/item.ts b/client/src/app/shared/models/agenda/item.ts
index b93ab3b6b..ee198f070 100644
--- a/client/src/app/shared/models/agenda/item.ts
+++ b/client/src/app/shared/models/agenda/item.ts
@@ -12,7 +12,6 @@ interface ContentObject {
  * @ignore
  */
 export class Item extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public item_number: string;
     public title: string;
@@ -29,11 +28,7 @@ export class Item extends BaseModel {
     public parent_id: number;
 
     public constructor(input?: any) {
-        super();
-        this._collectionString = 'agenda/item';
-        if (input) {
-            this.deserialize(input);
-        }
+        super('agenda/item', input);
     }
 
     public getSpeakers(): User[] {
diff --git a/client/src/app/shared/models/agenda/speaker.ts b/client/src/app/shared/models/agenda/speaker.ts
index e37d0e093..c1e53d0a8 100644
--- a/client/src/app/shared/models/agenda/speaker.ts
+++ b/client/src/app/shared/models/agenda/speaker.ts
@@ -1,4 +1,4 @@
-import { Deserializable } from '../deserializable.model';
+import { Deserializer } from '../deserializer.model';
 
 /**
  * Representation of a speaker in an agenda item
@@ -6,7 +6,7 @@ import { Deserializable } from '../deserializable.model';
  * Part of the 'speakers' list.
  * @ignore
  */
-export class Speaker implements Deserializable {
+export class Speaker extends Deserializer {
     public id: number;
     public user_id: number;
     public begin_time: string; // TODO this is a time object
@@ -20,12 +20,6 @@ export class Speaker implements Deserializable {
      * @param input
      */
     public constructor(input?: any) {
-        if (input) {
-            this.deserialize(input);
-        }
-    }
-
-    public deserialize(input: any): void {
-        Object.assign(this, input);
+        super(input);
     }
 }
diff --git a/client/src/app/shared/models/assignments/assignment-user.ts b/client/src/app/shared/models/assignments/assignment-user.ts
index 2ad7a82e5..092f86c32 100644
--- a/client/src/app/shared/models/assignments/assignment-user.ts
+++ b/client/src/app/shared/models/assignments/assignment-user.ts
@@ -1,10 +1,10 @@
-import { Deserializable } from '../deserializable.model';
+import { Deserializer } from '../deserializer.model';
 
 /**
  * Content of the 'assignment_related_users' property
  * @ignore
  */
-export class AssignmentUser implements Deserializable {
+export class AssignmentUser extends Deserializer {
     public id: number;
     public user_id: number;
     public elected: boolean;
@@ -16,12 +16,6 @@ export class AssignmentUser implements Deserializable {
      * @param input
      */
     public constructor(input?: any) {
-        if (input) {
-            this.deserialize(input);
-        }
-    }
-
-    public deserialize(input: any): void {
-        Object.assign(this, input);
+        super(input);
     }
 }
diff --git a/client/src/app/shared/models/assignments/assignment.ts b/client/src/app/shared/models/assignments/assignment.ts
index d90616936..8d7b4a91f 100644
--- a/client/src/app/shared/models/assignments/assignment.ts
+++ b/client/src/app/shared/models/assignments/assignment.ts
@@ -9,7 +9,6 @@ import { User } from '../users/user';
  * @ignore
  */
 export class Assignment extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public title: string;
     public description: string;
@@ -22,14 +21,7 @@ export class Assignment extends BaseModel {
     public tags_id: number[];
 
     public constructor(input?: any) {
-        super();
-        this._collectionString = 'assignments/assignment';
-        this.assignment_related_users = []; // TODO Array
-        this.polls = Array(); // TODO Array
-
-        if (input) {
-            this.deserialize(input);
-        }
+        super('assignments/assignment', input);
     }
 
     public getAssignmentReleatedUsers(): BaseModel | BaseModel[] {
@@ -47,15 +39,15 @@ export class Assignment extends BaseModel {
     public deserialize(input: any): void {
         Object.assign(this, input);
 
+        this.assignment_related_users = [];
         if (input.assignment_related_users instanceof Array) {
-            this.assignment_related_users = [];
             input.assignment_related_users.forEach(assignmentUserData => {
                 this.assignment_related_users.push(new AssignmentUser(assignmentUserData));
             });
         }
 
+        this.polls = [];
         if (input.polls instanceof Array) {
-            this.polls = [];
             input.polls.forEach(pollData => {
                 this.polls.push(new Poll(pollData));
             });
diff --git a/client/src/app/shared/models/assignments/poll-option.ts b/client/src/app/shared/models/assignments/poll-option.ts
index 308b0088a..5329f73ad 100644
--- a/client/src/app/shared/models/assignments/poll-option.ts
+++ b/client/src/app/shared/models/assignments/poll-option.ts
@@ -1,4 +1,4 @@
-import { Deserializable } from '../deserializable.model';
+import { Deserializer } from '../deserializer.model';
 
 /**
  * Representation of a poll option
@@ -6,7 +6,7 @@ import { Deserializable } from '../deserializable.model';
  * part of the 'polls-options'-array in poll
  * @ignore
  */
-export class PollOption implements Deserializable {
+export class PollOption extends Deserializer {
     public id: number;
     public candidate_id: number;
     public is_elected: boolean;
@@ -19,12 +19,6 @@ export class PollOption implements Deserializable {
      * @param input
      */
     public constructor(input?: any) {
-        if (input) {
-            this.deserialize(input);
-        }
-    }
-
-    public deserialize(input: any): void {
-        Object.assign(this, input);
+        super(input);
     }
 }
diff --git a/client/src/app/shared/models/assignments/poll.ts b/client/src/app/shared/models/assignments/poll.ts
index 8f402a99a..1375cd4a3 100644
--- a/client/src/app/shared/models/assignments/poll.ts
+++ b/client/src/app/shared/models/assignments/poll.ts
@@ -1,11 +1,11 @@
 import { PollOption } from './poll-option';
-import { Deserializable } from '../deserializable.model';
+import { Deserializer } from '../deserializer.model';
 
 /**
  * Content of the 'polls' property of assignments
  * @ignore
  */
-export class Poll implements Deserializable {
+export class Poll extends Deserializer {
     public id: number;
     public pollmethod: string;
     public description: string;
@@ -22,17 +22,14 @@ export class Poll implements Deserializable {
      * @param input
      */
     public constructor(input?: any) {
-        this.options = [new PollOption()];
-        if (input) {
-            this.deserialize(input);
-        }
+        super(input);
     }
 
     public deserialize(input: any): void {
         Object.assign(this, input);
 
+        this.options = [];
         if (input.options instanceof Array) {
-            this.options = [];
             input.options.forEach(pollOptionData => {
                 this.options.push(new PollOption(pollOptionData));
             });
diff --git a/client/src/app/shared/models/base.model.ts b/client/src/app/shared/models/base.model.ts
index 6f0522d42..19d4f8131 100644
--- a/client/src/app/shared/models/base.model.ts
+++ b/client/src/app/shared/models/base.model.ts
@@ -24,7 +24,7 @@ export abstract class BaseModel extends OpenSlidesComponent implements Deseriali
      *
      * Has a getter but no setter.
      */
-    protected abstract _collectionString: string;
+    protected _collectionString: string;
 
     /**
      * force children of BaseModel to have an id
@@ -34,8 +34,13 @@ export abstract class BaseModel extends OpenSlidesComponent implements Deseriali
     /**
      * constructor that calls super from parent class
      */
-    protected constructor() {
+    protected constructor(collectionString: string, input?: any) {
         super();
+        this._collectionString = collectionString;
+
+        if (input) {
+            this.deserialize(input);
+        }
     }
 
     /**
diff --git a/client/src/app/shared/models/core/chat-message.ts b/client/src/app/shared/models/core/chat-message.ts
index 60080a8f0..ae334cf38 100644
--- a/client/src/app/shared/models/core/chat-message.ts
+++ b/client/src/app/shared/models/core/chat-message.ts
@@ -6,18 +6,13 @@ import { User } from '../users/user';
  * @ignore
  */
 export class ChatMessage extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public message: string;
     public timestamp: string; // TODO: Type for timestamp
     public user_id: number;
 
     public constructor(input?: any) {
-        super();
-        this._collectionString = 'core/chat-message';
-        if (input) {
-            this.deserialize(input);
-        }
+        super('core/chat-message', input);
     }
 
     public getUser(): User {
diff --git a/client/src/app/shared/models/core/config.ts b/client/src/app/shared/models/core/config.ts
index c85275442..70fbd561d 100644
--- a/client/src/app/shared/models/core/config.ts
+++ b/client/src/app/shared/models/core/config.ts
@@ -5,17 +5,12 @@ import { BaseModel } from '../base.model';
  * @ignore
  */
 export class Config extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public key: string;
     public value: Object;
 
     public constructor(input?: any) {
-        super();
-        this._collectionString = 'core/config';
-        if (input) {
-            this.deserialize(input);
-        }
+        super('core/config', input);
     }
 }
 
diff --git a/client/src/app/shared/models/core/countdown.ts b/client/src/app/shared/models/core/countdown.ts
index d2fe0320a..134416899 100644
--- a/client/src/app/shared/models/core/countdown.ts
+++ b/client/src/app/shared/models/core/countdown.ts
@@ -5,7 +5,6 @@ import { BaseModel } from '../base.model';
  * @ignore
  */
 export class Countdown extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public description: string;
     public default_time: number;
@@ -13,11 +12,7 @@ export class Countdown extends BaseModel {
     public running: boolean;
 
     public constructor(input?: any) {
-        super();
-        this._collectionString = 'core/countdown';
-        if (input) {
-            this.deserialize(input);
-        }
+        super('core/countdown');
     }
 }
 
diff --git a/client/src/app/shared/models/core/projector-message.ts b/client/src/app/shared/models/core/projector-message.ts
index 782fbbd56..96f11084d 100644
--- a/client/src/app/shared/models/core/projector-message.ts
+++ b/client/src/app/shared/models/core/projector-message.ts
@@ -5,16 +5,11 @@ import { BaseModel } from '../base.model';
  * @ignore
  */
 export class ProjectorMessage extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public message: string;
 
     public constructor(input?: any) {
-        super();
-        this._collectionString = 'core/projector-message';
-        if (input) {
-            this.deserialize(input);
-        }
+        super('core/projector-message', input);
     }
 }
 
diff --git a/client/src/app/shared/models/core/projector.ts b/client/src/app/shared/models/core/projector.ts
index 271a708c6..48896f891 100644
--- a/client/src/app/shared/models/core/projector.ts
+++ b/client/src/app/shared/models/core/projector.ts
@@ -5,7 +5,6 @@ import { BaseModel } from '../base.model';
  * @ignore
  */
 export class Projector extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public elements: Object;
     public scale: number;
@@ -17,11 +16,7 @@ export class Projector extends BaseModel {
     public projectiondefaults: Object[];
 
     public constructor(input?: any) {
-        super();
-        this._collectionString = 'core/projector';
-        if (input) {
-            this.deserialize(input);
-        }
+        super('core/projector', input);
     }
 }
 
diff --git a/client/src/app/shared/models/core/tag.ts b/client/src/app/shared/models/core/tag.ts
index e8678bb15..c0e5c3554 100644
--- a/client/src/app/shared/models/core/tag.ts
+++ b/client/src/app/shared/models/core/tag.ts
@@ -5,16 +5,11 @@ import { BaseModel } from '../base.model';
  * @ignore
  */
 export class Tag extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public name: string;
 
     public constructor(input?: any) {
-        super();
-        this._collectionString = 'core/tag';
-        if (input) {
-            this.deserialize(input);
-        }
+        super('core/tag', input);
     }
 }
 
diff --git a/client/src/app/shared/models/deserializer.model.ts b/client/src/app/shared/models/deserializer.model.ts
new file mode 100644
index 000000000..8013ec618
--- /dev/null
+++ b/client/src/app/shared/models/deserializer.model.ts
@@ -0,0 +1,25 @@
+import { Deserializable } from './deserializable.model';
+
+/**
+ * Abstract base class for a basic implementation of Deserializable.
+ * The constructor also gives the possibility to give data that should be serialized.
+ */
+export abstract class Deserializer implements Deserializable {
+    /**
+     * Basic constructor with the possibility to give data to deserialize.
+     * @param input If data is given, {@method deserialize} will be called with that data
+     */
+    protected constructor(input?: any) {
+        if (input) {
+            this.deserialize(input);
+        }
+    }
+
+    /**
+     * should be used to assign JSON values to the object itself.
+     * @param input
+     */
+    public deserialize(input: any): void {
+        Object.assign(this, input);
+    }
+}
diff --git a/client/src/app/shared/models/mediafiles/file.ts b/client/src/app/shared/models/mediafiles/file.ts
index 02009935b..8ac48c45d 100644
--- a/client/src/app/shared/models/mediafiles/file.ts
+++ b/client/src/app/shared/models/mediafiles/file.ts
@@ -1,10 +1,10 @@
-import { Deserializable } from '../deserializable.model';
+import { Deserializer } from '../deserializer.model';
 
 /**
  * The name and the type of a mediaFile.
  * @ignore
  */
-export class File implements Deserializable {
+export class File extends Deserializer {
     public name: string;
     public type: string;
 
@@ -14,12 +14,6 @@ export class File implements Deserializable {
      * @param type The tape (jpg, png, pdf)
      */
     public constructor(input?: any) {
-        if (input) {
-            this.deserialize(input);
-        }
-    }
-
-    public deserialize(input: any): void {
-        Object.assign(this, input);
+        super(input);
     }
 }
diff --git a/client/src/app/shared/models/mediafiles/mediafile.ts b/client/src/app/shared/models/mediafiles/mediafile.ts
index c7a163676..548be70cb 100644
--- a/client/src/app/shared/models/mediafiles/mediafile.ts
+++ b/client/src/app/shared/models/mediafiles/mediafile.ts
@@ -7,7 +7,6 @@ import { User } from '../users/user';
  * @ignore
  */
 export class Mediafile extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public title: string;
     public mediafile: File;
@@ -18,11 +17,7 @@ export class Mediafile extends BaseModel {
     public timestamp: string;
 
     public constructor(input?: any) {
-        super();
-        this._collectionString = 'mediafiles/mediafile';
-        if (input) {
-            this.deserialize(input);
-        }
+        super('mediafiles/mediafile', input);
     }
 
     public deserialize(input: any): void {
diff --git a/client/src/app/shared/models/motions/category.ts b/client/src/app/shared/models/motions/category.ts
index aae765e05..46db19241 100644
--- a/client/src/app/shared/models/motions/category.ts
+++ b/client/src/app/shared/models/motions/category.ts
@@ -5,17 +5,12 @@ import { BaseModel } from '../base.model';
  * @ignore
  */
 export class Category extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public name: string;
     public prefix: string;
 
     public constructor(input?: any) {
-        super();
-        this._collectionString = 'motions/category';
-        if (input) {
-            this.deserialize(input);
-        }
+        super('motions/category', input);
     }
 
     public toString = (): string => {
diff --git a/client/src/app/shared/models/motions/motion-block.ts b/client/src/app/shared/models/motions/motion-block.ts
index 88d685131..54dccc629 100644
--- a/client/src/app/shared/models/motions/motion-block.ts
+++ b/client/src/app/shared/models/motions/motion-block.ts
@@ -6,17 +6,12 @@ import { Item } from '../agenda/item';
  * @ignore
  */
 export class MotionBlock extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public title: string;
     public agenda_item_id: number;
 
     public constructor(input?: any) {
-        super();
-        this._collectionString = 'motions/motion-block';
-        if (input) {
-            this.deserialize(input);
-        }
+        super('motions/motion-block', input);
     }
 
     public getAgenda(): BaseModel | BaseModel[] {
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 fb8f9eb4c..12325dc7f 100644
--- a/client/src/app/shared/models/motions/motion-change-reco.ts
+++ b/client/src/app/shared/models/motions/motion-change-reco.ts
@@ -5,7 +5,6 @@ import { BaseModel } from '../base.model';
  * @ignore
  */
 export class MotionChangeReco extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public motion_version_id: number;
     public rejected: boolean;
@@ -17,11 +16,7 @@ export class MotionChangeReco extends BaseModel {
     public creation_time: string;
 
     public constructor(input?: any) {
-        super();
-        this._collectionString = 'motions/motion-change-recommendation';
-        if (input) {
-            this.deserialize(input);
-        }
+        super('motions/motion-change-recommendation', input);
     }
 }
 
diff --git a/client/src/app/shared/models/motions/motion-comment-section.ts b/client/src/app/shared/models/motions/motion-comment-section.ts
new file mode 100644
index 000000000..c4c96617c
--- /dev/null
+++ b/client/src/app/shared/models/motions/motion-comment-section.ts
@@ -0,0 +1,18 @@
+import { BaseModel } from '../base.model';
+
+/**
+ * Representation of a motion category. Has the nested property "File"
+ * @ignore
+ */
+export class MotionCommentSection extends BaseModel {
+    public id: number;
+    public name: string;
+    public read_groups_id: number[];
+    public write_groups_id: number[];
+
+    public constructor(input?: any) {
+        super('motions/motion-comment-section', input);
+    }
+}
+
+BaseModel.registerCollectionElement('motions/motion-comment-section', MotionCommentSection);
diff --git a/client/src/app/shared/models/motions/motion-comment.ts b/client/src/app/shared/models/motions/motion-comment.ts
new file mode 100644
index 000000000..78447574b
--- /dev/null
+++ b/client/src/app/shared/models/motions/motion-comment.ts
@@ -0,0 +1,15 @@
+import { Deserializer } from '../deserializer.model';
+
+/**
+ * Representation of a Motion Comment.
+ */
+export class MotionComment extends Deserializer {
+    public id: number;
+    public comment: string;
+    public section_id: number;
+    public read_groups_id: number[];
+
+    public constructor(input?: any) {
+        super(input);
+    }
+}
diff --git a/client/src/app/shared/models/motions/motion-log.ts b/client/src/app/shared/models/motions/motion-log.ts
index 2e240ecbc..952f00cec 100644
--- a/client/src/app/shared/models/motions/motion-log.ts
+++ b/client/src/app/shared/models/motions/motion-log.ts
@@ -1,23 +1,17 @@
-import { Deserializable } from '../deserializable.model';
+import { Deserializer } from '../deserializer.model';
 
 /**
- * Representation of a Motion Version.
+ * Representation of a Motion Log.
  *
  * @ignore
  */
-export class MotionLog implements Deserializable {
+export class MotionLog extends Deserializer {
     public message_list: string[];
     public person_id: number;
     public time: string;
     public message: string;
 
     public constructor(input?: any) {
-        if (input) {
-            this.deserialize(input);
-        }
-    }
-
-    public deserialize(input: any): void {
-        Object.assign(this, input);
+        super(input);
     }
 }
diff --git a/client/src/app/shared/models/motions/motion-submitter.ts b/client/src/app/shared/models/motions/motion-submitter.ts
index b1399e639..665ad00cc 100644
--- a/client/src/app/shared/models/motions/motion-submitter.ts
+++ b/client/src/app/shared/models/motions/motion-submitter.ts
@@ -1,23 +1,17 @@
-import { Deserializable } from '../deserializable.model';
+import { Deserializer } from '../deserializer.model';
 
 /**
  * Representation of a Motion Submitter.
  *
  * @ignore
  */
-export class MotionSubmitter implements Deserializable {
+export class MotionSubmitter extends Deserializer {
     public id: number;
     public user_id: number;
     public motion_id: number;
     public weight: number;
 
     public constructor(input?: any) {
-        if (input) {
-            this.deserialize(input);
-        }
-    }
-
-    public deserialize(input: any): void {
-        Object.assign(this, input);
+        super(input);
     }
 }
diff --git a/client/src/app/shared/models/motions/motion-version.ts b/client/src/app/shared/models/motions/motion-version.ts
deleted file mode 100644
index 6fc9ff580..000000000
--- a/client/src/app/shared/models/motions/motion-version.ts
+++ /dev/null
@@ -1,30 +0,0 @@
-import { Deserializable } from '../deserializable.model';
-
-/**
- * Representation of a Motion Version.
- *
- * @ignore
- */
-export class MotionVersion implements Deserializable {
-    public id: number;
-    public version_number: number;
-    public creation_time: string;
-    public title: string;
-    public text: string;
-    public amendment_paragraphs: string;
-    public reason: string;
-
-    public constructor(input?: any) {
-        this.title = '';
-        this.text = '';
-        this.reason = '';
-
-        if (input) {
-            this.deserialize(input);
-        }
-    }
-
-    public deserialize(input: any): void {
-        Object.assign(this, input);
-    }
-}
diff --git a/client/src/app/shared/models/motions/motion.ts b/client/src/app/shared/models/motions/motion.ts
index 697b804de..4535467a9 100644
--- a/client/src/app/shared/models/motions/motion.ts
+++ b/client/src/app/shared/models/motions/motion.ts
@@ -6,6 +6,7 @@ import { Workflow } from './workflow';
 import { User } from '../users/user';
 import { Category } from './category';
 import { WorkflowState } from './workflow-state';
+import { MotionComment } from './motion-comment';
 
 /**
  * Representation of Motion.
@@ -15,7 +16,6 @@ import { WorkflowState } from './workflow-state';
  * @ignore
  */
 export class Motion extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public identifier: string;
     public title: string;
@@ -29,7 +29,7 @@ export class Motion extends BaseModel {
     public origin: string;
     public submitters: MotionSubmitter[];
     public supporters_id: number[];
-    public comments: Object[];
+    public comments: MotionComment[];
     public state_id: number;
     public state_extension: string;
     public state_required_permission_to_see: string;
@@ -45,22 +45,7 @@ export class Motion extends BaseModel {
     public workflow: Workflow;
 
     public constructor(input?: any) {
-        super();
-        this._collectionString = 'motions/motion';
-        this.identifier = '';
-        this.title = '';
-        this.text = '';
-        this.reason = '';
-        this.modified_final_version = '';
-        this.origin = '';
-        this.submitters = [];
-        this.supporters_id = [];
-        this.state_required_permission_to_see = '';
-        this.log_messages = [];
-
-        if (input) {
-            this.deserialize(input);
-        }
+        super('motions/motion', input);
         this.initDataStoreValues();
     }
 
@@ -186,19 +171,26 @@ export class Motion extends BaseModel {
     public deserialize(input: any): void {
         Object.assign(this, input);
 
+        this.submitters = [];
         if (input.submitters instanceof Array) {
-            this.submitters = [];
             input.submitters.forEach(SubmitterData => {
                 this.submitters.push(new MotionSubmitter(SubmitterData));
             });
         }
 
+        this.log_messages = [];
         if (input.log_messages instanceof Array) {
-            this.log_messages = [];
             input.log_messages.forEach(logData => {
                 this.log_messages.push(new MotionLog(logData));
             });
         }
+
+        this.comments = [];
+        if (input.comments instanceof Array) {
+            input.comments.forEach(commentData => {
+                this.comments.push(new MotionComment(commentData));
+            });
+        }
     }
 }
 
diff --git a/client/src/app/shared/models/motions/workflow-state.ts b/client/src/app/shared/models/motions/workflow-state.ts
index afeb16aca..99bf6f27d 100644
--- a/client/src/app/shared/models/motions/workflow-state.ts
+++ b/client/src/app/shared/models/motions/workflow-state.ts
@@ -1,4 +1,4 @@
-import { Deserializable } from '../deserializable.model';
+import { Deserializer } from '../deserializer.model';
 import { Workflow } from './workflow';
 
 /**
@@ -7,7 +7,7 @@ import { Workflow } from './workflow';
  * Part of the 'states'-array in motion/workflow
  * @ignore
  */
-export class WorkflowState implements Deserializable {
+export class WorkflowState extends Deserializer {
     public id: number;
     public name: string;
     public action_word: string;
@@ -17,8 +17,6 @@ export class WorkflowState implements Deserializable {
     public allow_support: boolean;
     public allow_create_poll: boolean;
     public allow_submitter_edit: boolean;
-    public versioning: boolean;
-    public leave_old_version_active: boolean;
     public dont_set_identifier: boolean;
     public show_state_extension_field: boolean;
     public show_recommendation_extension_field: boolean;
@@ -30,9 +28,7 @@ export class WorkflowState implements Deserializable {
      * @param input If given, it will be deserialized
      */
     public constructor(input?: any) {
-        if (input) {
-            this.deserialize(input);
-        }
+        super(input);
     }
 
     /**
@@ -49,10 +45,6 @@ export class WorkflowState implements Deserializable {
         return nextStates;
     }
 
-    public deserialize(input: any): void {
-        Object.assign(this, input);
-    }
-
     public toString = (): string => {
         return this.name;
     };
diff --git a/client/src/app/shared/models/motions/workflow.ts b/client/src/app/shared/models/motions/workflow.ts
index 99b2393d8..231d4c4c8 100644
--- a/client/src/app/shared/models/motions/workflow.ts
+++ b/client/src/app/shared/models/motions/workflow.ts
@@ -6,18 +6,13 @@ import { WorkflowState } from './workflow-state';
  * @ignore
  */
 export class Workflow extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public name: string;
     public states: WorkflowState[];
     public first_state: number;
 
     public constructor(input?: any) {
-        super();
-        this._collectionString = 'motions/workflow';
-        if (input) {
-            this.deserialize(input);
-        }
+        super('motions/workflow', input);
     }
 
     /**
diff --git a/client/src/app/shared/models/topics/topic.ts b/client/src/app/shared/models/topics/topic.ts
index c0db048ab..3eb0262d0 100644
--- a/client/src/app/shared/models/topics/topic.ts
+++ b/client/src/app/shared/models/topics/topic.ts
@@ -7,7 +7,6 @@ import { Item } from '../agenda/item';
  * @ignore
  */
 export class Topic extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public title: string;
     public text: string;
@@ -15,11 +14,7 @@ export class Topic extends BaseModel {
     public agenda_item_id: number;
 
     public constructor(input?: any) {
-        super();
-        this._collectionString = 'topics/topic';
-        if (input) {
-            this.deserialize(input);
-        }
+        super('topics/topic', input);
     }
 
     public getAttachments(): Mediafile[] {
diff --git a/client/src/app/shared/models/users/group.ts b/client/src/app/shared/models/users/group.ts
index ae458cf7e..41ea9d59e 100644
--- a/client/src/app/shared/models/users/group.ts
+++ b/client/src/app/shared/models/users/group.ts
@@ -6,17 +6,12 @@ import { User } from './user';
  * @ignore
  */
 export class Group extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public name: string;
     public permissions: string[];
 
     public constructor(input?: any) {
-        super();
-        this._collectionString = 'users/group';
-        if (input) {
-            this.deserialize(input);
-        }
+        super('users/group', input);
     }
 
     public get users(): User[] {
diff --git a/client/src/app/shared/models/users/personal-note.ts b/client/src/app/shared/models/users/personal-note.ts
index 26a607704..a13b46718 100644
--- a/client/src/app/shared/models/users/personal-note.ts
+++ b/client/src/app/shared/models/users/personal-note.ts
@@ -6,17 +6,12 @@ import { User } from './user';
  * @ignore
  */
 export class PersonalNote extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public user_id: number;
     public notes: Object;
 
     public constructor(input: any) {
-        super();
-        this._collectionString = 'users/personal-note';
-        if (input) {
-            this.deserialize(input);
-        }
+        super('users/personal-note', input);
     }
 
     public getUser(): User {
diff --git a/client/src/app/shared/models/users/user.ts b/client/src/app/shared/models/users/user.ts
index bdd94d95d..4467b7292 100644
--- a/client/src/app/shared/models/users/user.ts
+++ b/client/src/app/shared/models/users/user.ts
@@ -6,7 +6,6 @@ import { Group } from './group';
  * @ignore
  */
 export class User extends BaseModel {
-    protected _collectionString: string;
     public id: number;
     public username: string;
     public title: string;
@@ -25,12 +24,7 @@ export class User extends BaseModel {
     public default_password: string;
 
     public constructor(input?: any) {
-        super();
-        this._collectionString = 'users/user';
-
-        if (input) {
-            this.deserialize(input);
-        }
+        super('users/user', input);
     }
 
     public get groups(): Group[] {
diff --git a/client/src/app/site/start/start.component.ts b/client/src/app/site/start/start.component.ts
index 552f95c65..a4175184c 100644
--- a/client/src/app/site/start/start.component.ts
+++ b/client/src/app/site/start/start.component.ts
@@ -94,11 +94,11 @@ export class StartComponent extends BaseComponent implements OnInit {
         console.log('the user: ', user1fromStore);
 
         console.log('remove a single user:');
-        // this.DS.remove(User, 100);
+        this.DS.remove('users/user', 100);
         console.log('remove more users');
-        // this.DS.remove(User, 200, 201, 202);
+        this.DS.remove('users/user', 200, 201, 202);
         console.log('remove an array of users');
-        // this.DS.remove(User, ...[321, 363, 399]);
+        this.DS.remove('users/user', ...[321, 363, 399]);
 
         console.log('test filter: ');
         console.log(this.DS.filter<User>(User, user => user.id === 1));