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Introspected alternate SQLite FK definitions
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@ -106,16 +106,23 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
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# Walk through and look for references to other tables. SQLite doesn't
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# really have enforced references, but since it echoes out the SQL used
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# to create the table we can look for REFERENCES statements used there.
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field_names = []
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for field_index, field_desc in enumerate(results.split(',')):
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field_desc = field_desc.strip()
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if field_desc.startswith("UNIQUE"):
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continue
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m = re.search('references (.*) \(["|](.*)["|]\)', field_desc, re.I)
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field_names.append(field_desc.split()[0].strip('"'))
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m = re.search('references (\S*) ?\(["|]?(.*)["|]?\)', field_desc, re.I)
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if not m:
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continue
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table, column = [s.strip('"') for s in m.groups()]
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if field_desc.startswith("FOREIGN KEY"):
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# Find index of the target FK field
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m = re.match('FOREIGN KEY\(([^\)]*)\).*', field_desc, re.I)
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fkey_field = m.groups()[0].strip('"')
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field_index = field_names.index(fkey_field)
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cursor.execute("SELECT sql FROM sqlite_master WHERE tbl_name = %s", [table])
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result = cursor.fetchall()[0]
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@ -1,8 +1,10 @@
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from __future__ import unicode_literals
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from unittest import skipUnless
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from django.db import connection
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from django.db.utils import DatabaseError
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from django.test import TransactionTestCase, skipUnlessDBFeature
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from django.test import TransactionTestCase, mock, skipUnlessDBFeature
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from .models import Reporter, Article
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@ -119,6 +121,16 @@ class IntrospectionTests(TransactionTestCase):
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self.assertEqual(relations, {3: (0, Reporter._meta.db_table),
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4: (0, Article._meta.db_table)})
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@skipUnless(connection.vendor == 'sqlite', "This is an sqlite-specific issue")
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def test_get_relations_alt_format(self):
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"""With SQLite, foreign keys can be added with different syntaxes."""
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with connection.cursor() as cursor:
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cursor.fetchone = mock.Mock(return_value=[
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"CREATE TABLE track(id, art INTEGER, FOREIGN KEY(art) REFERENCES %s(id));" % Article._meta.db_table
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])
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relations = connection.introspection.get_relations(cursor, 'mocked_table')
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self.assertEqual(relations, {1: (0, Article._meta.db_table)})
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@skipUnlessDBFeature('can_introspect_foreign_keys')
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def test_get_key_columns(self):
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with connection.cursor() as cursor:
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