From f3f42957128c1e7ece584d45d9167f2ac003a3b8 Mon Sep 17 00:00:00 2001
From: Simon Willison <swillison@gmail.com>
Date: Sun, 22 Apr 2018 13:46:18 -0700
Subject: [PATCH] label_column now defined on the table-being-linked-to, fixes
 #234

---
 datasette/app.py   |  4 ++--
 tests/fixtures.py  | 11 +++++++++--
 tests/test_api.py  | 19 +++++++++++++++----
 tests/test_html.py |  2 +-
 4 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/datasette/app.py b/datasette/app.py
index 0b425c04..a69ac537 100644
--- a/datasette/app.py
+++ b/datasette/app.py
@@ -525,8 +525,8 @@ class RowTableShared(BaseView):
             foreign_keys = table_info['foreign_keys']['outgoing']
             for fk in foreign_keys:
                 label_column = (
-                    # First look for metadata.json definition:
-                    table_metadata.get('label_column')
+                    # First look in metadata.json definition for this foreign key table:
+                    self.table_metadata(database, fk['other_table']).get('label_column')
                     # Fall back to label_column from .inspect() detection:
                     or tables.get(fk['other_table'], {}).get('label_column')
                 )
diff --git a/tests/fixtures.py b/tests/fixtures.py
index 37e1f1b0..95f7a3da 100644
--- a/tests/fixtures.py
+++ b/tests/fixtures.py
@@ -97,7 +97,7 @@ METADATA = {
                         'frequency': 'Hz'
                     }
                 },
-                'custom_foreign_key_label': {
+                'primary_key_multiple_columns_explicit_label': {
                     'label_column': 'content2',
                 },
             }
@@ -145,6 +145,12 @@ CREATE TABLE primary_key_multiple_columns (
   content2 text
 );
 
+CREATE TABLE primary_key_multiple_columns_explicit_label (
+  id varchar(30) primary key,
+  content text,
+  content2 text
+);
+
 CREATE TABLE compound_primary_key (
   pk1 varchar(30),
   pk2 varchar(30),
@@ -221,7 +227,7 @@ CREATE TABLE "complex_foreign_keys" (
 CREATE TABLE "custom_foreign_key_label" (
   pk varchar(30) primary key,
   foreign_key_with_custom_label text,
-  FOREIGN KEY ("foreign_key_with_custom_label") REFERENCES [primary_key_multiple_columns](id)
+  FOREIGN KEY ("foreign_key_with_custom_label") REFERENCES [primary_key_multiple_columns_explicit_label](id)
 );
 
 CREATE TABLE units (
@@ -246,6 +252,7 @@ INSERT INTO simple_primary_key VALUES (2, 'world');
 INSERT INTO simple_primary_key VALUES (3, '');
 
 INSERT INTO primary_key_multiple_columns VALUES (1, 'hey', 'world');
+INSERT INTO primary_key_multiple_columns_explicit_label VALUES (1, 'hey', 'world2');
 
 INSERT INTO foreign_key_references VALUES (1, 1, 1);
 
diff --git a/tests/test_api.py b/tests/test_api.py
index 839dc1cb..130f30a3 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -17,7 +17,7 @@ def test_homepage(app_client):
     assert response.json.keys() == {'test_tables': 0}.keys()
     d = response.json['test_tables']
     assert d['name'] == 'test_tables'
-    assert d['tables_count'] == 14
+    assert d['tables_count'] == 15
 
 
 def test_database_page(app_client):
@@ -89,12 +89,12 @@ def test_database_page(app_client):
             'outgoing':  [{
                 'column': 'foreign_key_with_custom_label',
                 'other_column': 'id',
-                'other_table': 'primary_key_multiple_columns'
+                'other_table': 'primary_key_multiple_columns_explicit_label'
             }],
         },
         'label_column': None,
         'primary_keys': ['pk'],
-    },  {
+    }, {
         'columns': ['pk', 'foreign_key_with_label', 'foreign_key_with_no_label'],
         'name': 'foreign_key_references',
         'count': 1,
@@ -130,7 +130,18 @@ def test_database_page(app_client):
                 'column': 'id',
                 'other_column': 'foreign_key_with_no_label',
                 'other_table': 'foreign_key_references'
-            }, {
+            }],
+            'outgoing': []
+        },
+        'hidden': False,
+        'label_column': None,
+        'primary_keys': ['id']
+    }, {
+        'columns': ['id', 'content', 'content2'],
+        'name': 'primary_key_multiple_columns_explicit_label',
+        'count': 1,
+        'foreign_keys': {
+            'incoming': [{
                 'column': 'id',
                 'other_column': 'foreign_key_with_custom_label',
                 'other_table': 'custom_foreign_key_label'
diff --git a/tests/test_html.py b/tests/test_html.py
index ee12ce35..13433af6 100644
--- a/tests/test_html.py
+++ b/tests/test_html.py
@@ -301,7 +301,7 @@ def test_table_html_foreign_key_custom_label_column(app_client):
     expected = [
         [
             '<td class="col-pk"><a href="/test_tables/custom_foreign_key_label/1">1</a></td>',
-            '<td class="col-foreign_key_with_custom_label"><a href="/test_tables/primary_key_multiple_columns/1">world</a>\xa0<em>1</em></td>',
+            '<td class="col-foreign_key_with_custom_label"><a href="/test_tables/primary_key_multiple_columns_explicit_label/1">world2</a>\xa0<em>1</em></td>',
         ]
     ]
     assert expected == [[str(td) for td in tr.select('td')] for tr in table.select('tbody tr')]