Fixes #8012: Fixed fetching multiple relations between two tables for pgsql

framework/CHANGELOG.md

@@ -18,6 +18,7 @@ Yii Framework 2 Change Log
 - Bug #7868: Fixed creating raw sql (for logging) by skipping object and resource params (nineinchnick)
 - Bug #7868: Fixed Schema::getLastInsertID() by quoting sequence name (nineinchnick)
 - Bug #7957: Removed extra `parseFloat()` call for the `compare` js validator (CthulhuDen)
+- Bug #8012: Fixed fetching multiple relations between two tables for pgsql (nineinchnick)
 - Bug #8014: Fixed setting incorrect form "action" property after submitting a form using a link with "data-method" and containing "action" among "data-params" (samdark) 
 - Enh #6895: Added `ignoreCategories` config option for message command to ignore categories specified (samdark)
 - Enh #6975: Pressing arrows while focused in inputs of Active Form with `validateOnType` enabled no longer triggers validation (slinstj)

framework/db/pgsql/Schema.php

@@ -225,12 +225,13 @@ SQL;
 
         $sql = <<<SQL
 select
+    ct.conname as constraint_name,
     a.attname as column_name,
     fc.relname as foreign_table_name,
     fns.nspname as foreign_table_schema,
     fa.attname as foreign_column_name
 from
-    (SELECT ct.conrelid, ct.confrelid, ct.conkey, ct.contype, ct.confkey, generate_subscripts(ct.conkey, 1) AS s
+    (SELECT ct.conname, ct.conrelid, ct.confrelid, ct.conkey, ct.contype, ct.confkey, generate_subscripts(ct.conkey, 1) AS s
        FROM pg_constraint ct
     ) AS ct
     inner join pg_class c on c.oid=ct.conrelid
@@ -254,14 +255,17 @@ SQL;
             } else {
                 $foreignTable = $constraint['foreign_table_name'];
             }
-            $constraints[$foreignTable][$constraint['column_name']] = $constraint['foreign_column_name'];
+            $name = $constraint['constraint_name'];
+            if (!isset($constraints[$name])) {
+                $constraints[$name] = [
+                    'tableName' => $foreignTable,
+                    'columns' => [],
+                ];
             }
-        foreach ($constraints as $foreignTable => $columns) {
-            $citem = [$foreignTable];
-            foreach ($columns as $column => $foreignColumn) {
-                $citem[$column] = $foreignColumn;
+            $constraints[$name]['columns'][$constraint['column_name']] = $constraint['foreign_column_name'];
         }
-            $table->foreignKeys[] = $citem;
+        foreach ($constraints as $constraint) {
+            $table->foreignKeys[] = array_merge([$constraint['tableName']], $constraint['columns']);
         }
     }