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Update tag viewing to cover "ends with" as well

Previously, topic lists filtered down to a tag were using "descendant
of", so for example a listing based around the "ask" tag would show
topics that have the exact tag "ask" as well as any sub-tags, such as
"ask.survey". However, it wouldn't show a hypothetical "example.ask"
tag, where the "ask" was at the end.

This commit updates the method used to utilize lqueries to search for
tags that either start or end with the specified one (which includes
exact full matches as well).
merge-requests/40/head
Deimos 6 years ago
parent
commit
a0d69a97c2
  1. 12
      tildes/tildes/lib/database.py
  2. 13
      tildes/tildes/models/topic/topic_query.py

12
tildes/tildes/lib/database.py

@ -14,6 +14,7 @@ from sqlalchemy.engine.interfaces import Dialect
from sqlalchemy.orm.session import Session
from sqlalchemy.types import UserDefinedType
from sqlalchemy_utils import LtreeType
from sqlalchemy_utils.types.ltree import LQUERY
# https://www.postgresql.org/docs/current/static/errcodes-appendix.html
@ -128,8 +129,8 @@ class ArrayOfLtree(ARRAY): # pylint: disable=too-many-ancestors
class comparator_factory(ARRAY.comparator_factory):
"""Add custom comparison functions.
The ancestor_of and descendant_of functions are supported by LtreeType, so this
duplicates them here so they can be used on ArrayOfLtree too.
The ancestor_of, descendant_of, and lquery functions are supported by LtreeType,
so this duplicates them here so they can be used on ArrayOfLtree too.
"""
def ancestor_of(self, other): # type: ignore
@ -139,3 +140,10 @@ class ArrayOfLtree(ARRAY): # pylint: disable=too-many-ancestors
def descendant_of(self, other): # type: ignore
"""Return whether the array contains any descendant of `other`."""
return self.op("<@")(other)
def lquery(self, other): # type: ignore
"""Return whether the array matches the lquery/lqueries in `other`."""
if isinstance(other, list):
return self.op("?")(cast(other, ARRAY(LQUERY)))
else:
return self.op("~")(other)

13
tildes/tildes/models/topic/topic_query.py

@ -134,14 +134,15 @@ class TopicQuery(PaginatedQuery):
return self.filter(Topic.created_time > start_time)
def has_tag(self, tag: Ltree) -> "TopicQuery":
"""Restrict the topics to ones with a specific tag (generative)."""
# casting tag to string really shouldn't be necessary, but some kind of strange
# interaction seems to be happening with the ArrayOfLtree class, this will need
# some investigation
tag = str(tag)
"""Restrict the topics to ones with a specific tag (generative).
Note that this method searches for topics that have any tag that either starts
or ends with the specified tag, not only exact/full matches.
"""
queries = [f"{tag}.*", f"*.{tag}"]
# pylint: disable=protected-access
return self.filter(Topic._tags.descendant_of(tag)) # type: ignore
return self.filter(Topic._tags.lquery(queries)) # type: ignore
def search(self, query: str) -> "TopicQuery":
"""Restrict the topics to ones that match a search query (generative)."""

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