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""" |
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byceps.services.news.service |
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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:Copyright: 2006-2020 Jochen Kupperschmidt |
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:License: Modified BSD, see LICENSE for details. |
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""" |
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from datetime import datetime |
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from typing import Dict, Optional, Sequence |
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from ...database import db, paginate, Pagination, Query |
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from ...events.news import NewsItemPublished |
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from ...typing import UserID |
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from ..user import service as user_service |
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from .channel_service import _db_entity_to_channel |
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from .models.channel import Channel as DbChannel |
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from .models.item import ( |
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CurrentVersionAssociation as DbCurrentVersionAssociation, |
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Item as DbItem, |
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ItemVersion as DbItemVersion, |
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) |
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from . import image_service |
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from .transfer.models import ChannelID, Item, ItemID, ItemVersionID |
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def create_item( |
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channel_id: ChannelID, |
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slug: str, |
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creator_id: UserID, |
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title: str, |
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body: str, |
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*, |
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image_url_path: Optional[str] = None, |
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) -> Item: |
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"""Create a news item, a version, and set the version as the item's |
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current one. |
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""" |
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item = DbItem(channel_id, slug) |
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db.session.add(item) |
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version = _create_version( |
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item, creator_id, title, body, image_url_path=image_url_path |
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) |
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db.session.add(version) |
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current_version_association = DbCurrentVersionAssociation(item, version) |
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db.session.add(current_version_association) |
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db.session.commit() |
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return _db_entity_to_item(item) |
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def update_item( |
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item_id: ItemID, |
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slug: str, |
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creator_id: UserID, |
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title: str, |
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body: str, |
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*, |
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image_url_path: Optional[str] = None, |
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) -> None: |
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"""Update a news item by creating a new version of it and setting |
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the new version as the current one. |
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""" |
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item = _get_db_item(item_id) |
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item.slug = slug |
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version = _create_version( |
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item, creator_id, title, body, image_url_path=image_url_path |
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) |
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db.session.add(version) |
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item.current_version = version |
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db.session.commit() |
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def _create_version( |
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item: DbItem, |
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creator_id: UserID, |
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title: str, |
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body: str, |
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*, |
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image_url_path: Optional[str] = None, |
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) -> DbItemVersion: |
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version = DbItemVersion(item, creator_id, title, body) |
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if image_url_path: |
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version.image_url_path = image_url_path |
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return version |
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def publish_item( |
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item_id: ItemID, *, initiator_id: Optional[UserID] = None |
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) -> NewsItemPublished: |
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"""Publish a news item.""" |
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db_item = _get_db_item(item_id) |
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if initiator_id is not None: |
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initiator = user_service.get_user(initiator_id) |
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else: |
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initiator = None |
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db_item.published_at = datetime.utcnow() |
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db.session.commit() |
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item = _db_entity_to_item(db_item) |
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return NewsItemPublished( |
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occurred_at=item.published_at, |
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initiator_id=initiator.id if initiator else None, |
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initiator_screen_name=initiator.screen_name if initiator else None, |
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item_id=item.id, |
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channel_id=item.channel.id, |
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title=item.title, |
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external_url=item.external_url, |
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) |
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def delete_item(item_id: ItemID) -> None: |
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"""Delete a news item and its versions.""" |
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db.session.query(DbCurrentVersionAssociation) \ |
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.filter_by(item_id=item_id) \ |
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.delete() |
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db.session.query(DbItemVersion) \ |
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.filter_by(item_id=item_id) \ |
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.delete() |
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db.session.query(DbItem) \ |
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.filter_by(id=item_id) \ |
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.delete() |
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db.session.commit() |
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def find_item(item_id: ItemID) -> Optional[Item]: |
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"""Return the item with that id, or `None` if not found.""" |
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item = _find_db_item(item_id) |
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if item is None: |
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return None |
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return _db_entity_to_item(item) |
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def _find_db_item(item_id: ItemID) -> Optional[DbItem]: |
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"""Return the item with that id, or `None` if not found.""" |
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return DbItem.query \ |
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.with_channel() \ |
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.with_images() \ |
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.get(item_id) |
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def _get_db_item(item_id: ItemID) -> DbItem: |
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"""Return the item with that id, or raise an exception.""" |
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item = _find_db_item(item_id) |
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if item is None: |
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raise ValueError(f'Unknown news item ID "{item_id}".') |
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return item |
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def find_aggregated_item_by_slug( |
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channel_id: ChannelID, slug: str, *, published_only: bool = False |
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) -> Optional[Item]: |
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"""Return the news item identified by that slug, or `None` if not found.""" |
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query = DbItem.query \ |
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.for_channel(channel_id) \ |
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.with_channel() \ |
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.with_current_version() \ |
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.with_images() \ |
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.filter_by(slug=slug) |
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if published_only: |
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query = query.published() |
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item = query.one_or_none() |
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if item is None: |
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return None |
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return _db_entity_to_item(item) |
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def get_aggregated_items_paginated( |
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channel_id: ChannelID, |
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page: int, |
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items_per_page: int, |
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*, |
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published_only: bool = False, |
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) -> Pagination: |
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"""Return the news items to show on the specified page.""" |
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query = _get_items_query(channel_id) |
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if published_only: |
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query = query.published() |
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return paginate(query, page, items_per_page, item_mapper=_db_entity_to_item) |
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def get_items_paginated( |
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channel_id: ChannelID, page: int, items_per_page: int |
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) -> Pagination: |
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"""Return the news items to show on the specified page.""" |
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return _get_items_query(channel_id) \ |
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.paginate(page, items_per_page) |
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def _get_items_query(channel_id: ChannelID) -> Query: |
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return DbItem.query \ |
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.for_channel(channel_id) \ |
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.with_channel() \ |
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.with_current_version() \ |
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.with_images() \ |
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.order_by(DbItem.published_at.desc()) |
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def get_item_versions(item_id: ItemID) -> Sequence[DbItemVersion]: |
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"""Return all item versions, sorted from most recent to oldest.""" |
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return DbItemVersion.query \ |
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.for_item(item_id) \ |
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.order_by(DbItemVersion.created_at.desc()) \ |
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.all() |
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def get_current_item_version(item_id: ItemID) -> DbItemVersion: |
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"""Return the item's current version.""" |
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item = _get_db_item(item_id) |
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return item.current_version |
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def find_item_version(version_id: ItemVersionID) -> DbItemVersion: |
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"""Return the item version with that ID, or `None` if not found.""" |
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return DbItemVersion.query.get(version_id) |
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def get_item_count_by_channel_id() -> Dict[ChannelID, int]: |
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"""Return news item count (including 0) per channel, indexed by |
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channel ID. |
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""" |
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channel_ids_and_item_counts = db.session \ |
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.query( |
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DbChannel.id, |
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db.func.count(DbItem.id) |
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) \ |
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.outerjoin(DbItem) \ |
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.group_by(DbChannel.id) \ |
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.all() |
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return dict(channel_ids_and_item_counts) |
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def _db_entity_to_item(item: DbItem) -> Item: |
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channel = _db_entity_to_channel(item.channel) |
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external_url = item.channel.url_prefix + item.slug |
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image_url_path = _assemble_image_url_path(item) |
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images = [ |
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image_service._db_entity_to_image(image, item.channel_id) |
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for image in item.images |
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] |
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return Item( |
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id=item.id, |
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channel=channel, |
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slug=item.slug, |
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published_at=item.published_at, |
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published=item.published_at is not None, |
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title=item.current_version.title, |
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body=item.current_version.body, |
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external_url=external_url, |
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image_url_path=image_url_path, |
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images=images, |
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) |
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def _assemble_image_url_path(item: DbItem) -> Optional[str]: |
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url_path = item.current_version.image_url_path |
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if not url_path: |
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return None |
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return f'/data/global/news_channels/{item.channel_id}/{url_path}' |
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