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https://github.com/paperless-ngx/paperless-ngx.git
synced 2025-04-02 13:45:10 -05:00
71 lines
2.0 KiB
Python
71 lines
2.0 KiB
Python
from django.conf import settings
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from django.db import models
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from django.db.models.aggregates import Max
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class GroupConcat(models.Aggregate):
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"""
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Theoretically, this should work in Sqlite, PostgreSQL, and MySQL, but I've
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only ever tested it in Sqlite.
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"""
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ENGINE_SQLITE = 1
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ENGINE_POSTGRESQL = 2
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ENGINE_MYSQL = 3
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ENGINES = {
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"django.db.backends.sqlite3": ENGINE_SQLITE,
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"django.db.backends.postgresql_psycopg2": ENGINE_POSTGRESQL,
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"django.db.backends.postgresql": ENGINE_POSTGRESQL,
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"django.db.backends.mysql": ENGINE_MYSQL
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}
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def __init__(self, expression, separator="\n", **extra):
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self.engine = self._get_engine()
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self.function = self._get_function()
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self.template = self._get_template(separator)
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models.Aggregate.__init__(
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self,
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expression,
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output_field=models.CharField(),
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**extra
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)
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def _get_engine(self):
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engine = settings.DATABASES["default"]["ENGINE"]
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try:
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return self.ENGINES[engine]
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except KeyError:
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raise NotImplementedError(
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"There's currently no support for {} when it comes to group "
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"concatenation in Paperless".format(engine)
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)
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def _get_function(self):
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if self.engine == self.ENGINE_POSTGRESQL:
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return "STRING_AGG"
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return "GROUP_CONCAT"
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def _get_template(self, separator):
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if self.engine == self.ENGINE_MYSQL:
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return "%(function)s(%(expressions)s SEPARATOR '{}')".format(
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separator)
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return "%(function)s(%(expressions)s, '{}')".format(separator)
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class LogQuerySet(models.query.QuerySet):
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def by_group(self):
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return self.values("group").annotate(
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time=Max("modified"),
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messages=GroupConcat("message"),
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).order_by("-time")
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class LogManager(models.Manager):
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def get_queryset(self):
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return LogQuerySet(self.model, using=self._db)
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