From aaf45d542245c2d209ca63f97295f5f746a41997 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pave=C5=82=20Ty=C5=9Blacki?= <pavel.tyslacki@gmail.com>
Date: Thu, 28 Feb 2019 00:30:39 +0300
Subject: [PATCH] [2.2.x] Unified nonexistent foreign key introspection value
 for SQLite.

Backport of b777c0675ef7aadc299844025cf1f9b53562524f from master.
---
 django/db/backends/sqlite3/introspection.py | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/django/db/backends/sqlite3/introspection.py b/django/db/backends/sqlite3/introspection.py
index c8ed8b8f88..fd8accb04e 100644
--- a/django/db/backends/sqlite3/introspection.py
+++ b/django/db/backends/sqlite3/introspection.py
@@ -272,7 +272,7 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
                         'unique': True,
                         'columns': [],
                         'primary_key': False,
-                        'foreign_key': False,
+                        'foreign_key': None,
                         'check': False,
                         'index': False,
                     }
@@ -290,7 +290,7 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
                         'columns': columns,
                         'primary_key': False,
                         'unique': False,
-                        'foreign_key': False,
+                        'foreign_key': None,
                         'index': False,
                     }
         # Get the index info
@@ -307,7 +307,7 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
                         "columns": [],
                         "primary_key": False,
                         "unique": bool(unique),
-                        "foreign_key": False,
+                        "foreign_key": None,
                         "check": False,
                         "index": True,
                     }
@@ -337,7 +337,7 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
                 "columns": [pk_column],
                 "primary_key": True,
                 "unique": False,  # It's not actually a unique constraint.
-                "foreign_key": False,
+                "foreign_key": None,
                 "check": False,
                 "index": False,
             }