278 lines
12 KiB
Python
278 lines
12 KiB
Python
from collections import defaultdict
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from typing import Any, Dict, List, Tuple
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from django.conf import settings
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from django.db import transaction
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from django.db.models import Model, Prefetch
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from ..core.config import config
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from ..utils.rest_api import ValidationError
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from .models import Category, Motion
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__all__ = ["numbering"]
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def numbering(main_category: Category) -> List[Model]:
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"""
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Given the _main category_ by params the numbering of all motions in this or
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any subcategory is done. The numbering behaves as defined by the the following rules:
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- The set of the main category with all child categories are _affected categories_.
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- All motions in the affected categories are _affected motions_.
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- All affected motions are numbered with respect to 'category_weight' ordering.
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- Checks, if parents of all affected amendments, are also affected.
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So, all parents of every affected amendment must also be affected. If not,
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an error will be returned.
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- If a category does not have a prefix, the prefix of the first parent with
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one will be taken. This is just checked until the main category is reached.
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So, if the main category does not have a prefix, no prefix will be used.
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- If a motions should get a new identifier, that already a non-affected motion has,
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an error will be returned. It is ensured, that all identifiers generated with
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call will be unique.
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- Identifier of non-amendments: <A><B><C>
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<A>: Categories calculated prefix (see above; note: can be blank)
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<B>: '' if blanks are disabled or <A> is blank, else ' '
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<C>: Motion counter (unique existing counter for all affected motions)
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- Amendments: An amendment will get the following identifier: <A><B><C>
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<A>: Parent's _new_ identifier
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<B>: '', if blanks are disabled, else ' '
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<C>: Amendment prefix
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<D>: Amendment counter (counter for amendments of one parent)
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- Both counters may be filled with leading zeros according to `Motion.extend_identifier_number`
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- On errors, ValidationErrors with appropriate content will be raised.
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"""
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# If MOTION_IDENTIFIER_WITHOUT_BLANKS is set, don't use blanks when building identifier.
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without_blank = (
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hasattr(settings, "MOTION_IDENTIFIER_WITHOUT_BLANKS")
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and settings.MOTION_IDENTIFIER_WITHOUT_BLANKS
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)
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# Get child categories (to build affected categories) and precalculate all prefixes.
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child_categories = get_child_categories(main_category)
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category_prefix_mapping = get_category_prefix_mapping(
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main_category, child_categories, without_blank
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)
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# put together to affected_categories
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affected_categories = [main_category]
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affected_categories.extend(child_categories)
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# Get all affected motions
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affected_motions = get_affected_motions(affected_categories)
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# The affected_motion_ids is used for a fast lookup later.
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affected_motion_ids = set([motion.id for motion in affected_motions])
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# Assert, that we do have some motions.
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if len(affected_motions) == 0:
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raise ValidationError({"detail": "No motions were numbered"})
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# To ensure, that amendments will get the _new_ identifier of the parent, the affected
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# motions are split in disjoint lists (keep the ordering right) by their " amendment level"
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# in the motion (amendment) tree. There are at most len(affected_motions) levels.
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# In this step it is also ensures, that every parent of an amendment is an affected motion.
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max_amendment_level, amendment_level_mapping = get_amendment_level_mapping(
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affected_motions, affected_motion_ids, main_category
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)
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# Generate new identifiers.
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new_identifier_mapping = generate_new_identifiers(
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max_amendment_level,
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amendment_level_mapping,
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category_prefix_mapping,
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without_blank,
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)
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# Check, if all new identifiers are not used in all non-afected motions.
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check_new_identifiers_for_conflicts(new_identifier_mapping, affected_motion_ids)
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# Change all identifiers
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return update_identifiers(affected_motions, new_identifier_mapping)
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def get_child_categories(main_category: Category) -> List[Category]:
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# -> generate a mapping from a category id to all it's children with respect to `weight`:
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category_children_mapping: Dict[int, List[Category]] = defaultdict(list)
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# Optimize lookupqueries by prefetching all relations for motions
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prefetched_queryset = Category.objects.prefetch_related(
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Prefetch(
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"motion_set",
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queryset=Motion.objects.get_full_queryset()
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.prefetch_related("parent")
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.order_by("category_weight", "id"),
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)
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)
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for category in prefetched_queryset.exclude(parent=None).order_by("weight").all():
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category_children_mapping[category.parent_id].append(category)
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# - collect child categories
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child_categories = [] # they are ordered like a flat tree would be.
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queue = category_children_mapping[main_category.id]
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queue.reverse()
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while len(queue) > 0:
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category = queue.pop()
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child_categories.append(category)
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children = category_children_mapping[category.id]
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if children:
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children.reverse()
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queue.extend(children)
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return child_categories
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def get_category_prefix_mapping(
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main_category: Category, child_categories: List[Category], without_blank: bool
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) -> Dict[int, str]:
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# Precalculates all prefixes, e.g. traversing the category tree up, if a category
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# does not have a prefix to search for a parent's one. Also the without_blank is
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# respected, so the prefixes may will have blanks.
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# Add main category as a lookup anchor.
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category_prefix_mapping: Dict[int, str] = {}
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if not main_category.prefix:
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main_category_prefix = ""
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elif without_blank:
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main_category_prefix = main_category.prefix
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else:
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main_category_prefix = f"{main_category.prefix} "
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category_prefix_mapping[main_category.id] = main_category_prefix
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for category in child_categories:
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# Update prefix map. It is ensured, that the parent does have a calculated prefix, because
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# the child_categories is an ordered flat tree.
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if category.prefix:
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if without_blank:
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prefix = category.prefix
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else:
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prefix = f"{category.prefix} "
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category_prefix_mapping[category.id] = prefix
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else:
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category_prefix_mapping[category.id] = category_prefix_mapping[
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category.parent_id
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]
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return category_prefix_mapping
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def get_affected_motions(affected_categories) -> List[Motion]:
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# Affected motions: A list of motions from all categories in the right category order
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# and sorted with `category_weight` per category.
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affected_motions = []
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for category in affected_categories:
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affected_motions.extend(
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list(category.motion_set.all())
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) # The motions should be ordered correctly by the prefetch statement in `get_child_categories`
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return affected_motions
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def get_amendment_level_mapping(
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affected_motions, affected_motion_ids, main_category
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) -> Tuple[int, Dict[int, List[Motion]]]:
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amendment_level_mapping: Dict[int, List[Motion]] = defaultdict(list)
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max_amendment_level = 0
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for motion in affected_motions:
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level = motion.amendment_level
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amendment_level_mapping[level].append(motion)
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if level > max_amendment_level:
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max_amendment_level = level
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if motion.parent_id is not None and motion.parent_id not in affected_motion_ids:
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raise ValidationError(
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{
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"detail": f'Amendment "{motion}" cannot be numbered, because '
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f"it's lead motion ({motion.parent}) is not in category "
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f"{main_category} or any subcategory."
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}
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)
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return max_amendment_level, amendment_level_mapping
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def generate_new_identifiers(
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max_amendment_level, amendment_level_mapping, category_prefix_mapping, without_blank
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) -> Dict[int, Any]:
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# Generate identifiers for all lead motions.
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new_identifier_mapping = {}
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for i, main_motion in enumerate(amendment_level_mapping[0]):
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prefix = category_prefix_mapping[
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main_motion.category_id
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] # without_blank is precalculated.
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number = i + 1
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identifier = f"{prefix}{Motion.extend_identifier_number(number)}"
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new_identifier_mapping[main_motion.id] = {
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"identifier": identifier,
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"number": number,
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}
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# - Generate new identifiers for all amendments. For this, they are travesed by level,
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# so the parent's identifier is already set.
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amendment_counter: Dict[int, int] = defaultdict(
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lambda: 1
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) # maps amendment parent ids to their counter values.
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for level in range(1, max_amendment_level + 1):
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for amendment in amendment_level_mapping[level]:
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number = amendment_counter[amendment.parent_id]
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amendment_counter[amendment.parent_id] += 1
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parent_identifier = new_identifier_mapping[amendment.parent_id][
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"identifier"
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]
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if without_blank:
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prefix = f"{parent_identifier}{config['motions_amendments_prefix']}"
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else:
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prefix = f"{parent_identifier} {config['motions_amendments_prefix']} "
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identifier = f"{prefix}{Motion.extend_identifier_number(number)}"
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new_identifier_mapping[amendment.id] = {
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"identifier": identifier,
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"number": number,
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}
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return new_identifier_mapping
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def check_new_identifiers_for_conflicts(
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new_identifier_mapping, affected_motion_ids
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) -> None:
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all_new_identifiers = [
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entry["identifier"] for entry in new_identifier_mapping.values()
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]
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# Check, if any new identifier exists in any non-affected motion
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conflicting_motions = Motion.objects.exclude(id__in=affected_motion_ids).filter(
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identifier__in=all_new_identifiers
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)
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if conflicting_motions.exists():
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# We do have a conflict. Build a nice error message.
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conflicting_motion = conflicting_motions.first()
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if conflicting_motion.category:
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error_message = (
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"Numbering aborted because the motion identifier "
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f'"{conflicting_motion.identifier}" already exists in '
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f"category {conflicting_motion.category}."
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)
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else:
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error_message = (
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"Numbering aborted because the motion identifier "
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f'"{conflicting_motion.identifier}" already exists.'
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)
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raise ValidationError({"detail": error_message})
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def update_identifiers(affected_motions, new_identifier_mapping) -> List[Model]:
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# Acutally update the identifiers now.
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with transaction.atomic():
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changed_instances = []
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# Remove old identifiers, to avoid conflicts within the affected motions
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for motion in affected_motions:
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motion.identifier = None
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# This line is to skip agenda item and list of speakers autoupdate.
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# See agenda/signals.py.
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motion.set_skip_autoupdate_agenda_item_and_list_of_speakers()
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motion.save(skip_autoupdate=True)
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# Set the indetifier
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for motion in affected_motions:
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motion.identifier = new_identifier_mapping[motion.id]["identifier"]
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motion.identifier_number = new_identifier_mapping[motion.id]["number"]
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motion.set_skip_autoupdate_agenda_item_and_list_of_speakers()
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motion.save(skip_autoupdate=True)
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changed_instances.append(motion)
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if motion.agenda_item:
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changed_instances.append(motion.agenda_item)
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changed_instances.append(motion.list_of_speakers)
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return changed_instances
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