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vendor/yiisoft/yii2-gii/UPGRADE.md

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+Upgrading Instructions
+======================
+
+This file contains the upgrade notes. These notes highlight changes that could break your
+application when you upgrade the package from one version to another.
+
+Upgrade to 2.2.0
+----------------
+
+* The return value of `generators/model/Generator::checkJunctionTable()` has changed.
+  This will only have an impact if you have extended the `generators/model/Generator` class
+  and use the return value of `checkJunctionTable()`.
+  
+  Before version 2.2.0 the return value had the following structure (sample data, content may vary)
+
+  ```php
+  [ //list of junctions
+      0 => [ // first junction
+          0 => [ // "left" side of junction
+              0              => 'schema1.multi_pk', //table name
+              'multi_pk_id1' => 'id1', //foreign key
+              'multi_pk_id2' => 'id2', //foreign key
+          ],
+          1 => [ // "right" side of junction
+              0           => 'schema1.table1', //table name
+              'table1_id' => 'id', //foreign key
+          ],
+      ],
+  ];
+  ```
+  
+  Since version 2.2.0 the "left" and "right" side junctions no longer contain the 'foreign key mapping' directly
+  but contains an array of witch index 0 is the 'foreign key mapping' and index 1 the name of the foreign key.
+  (sample data, content may vary)
+  ```php
+  [ //list of junctions
+      0 => [ // first junction
+          0 => [ // "left" side of junction
+              0 => [ // foreign key mapping
+                  0              => 'schema1.multi_pk', //table name
+                  'multi_pk_id1' => 'id1', //foreign key
+                  'multi_pk_id2' => 'id2', //foreign key
+              ],
+              1 => 'schema1.junction1.j1_multi_pk_fkey' //New: Name of the foreign key
+          ],
+          1 => [ // "right" side of junction
+              0 => [ // foreign key mapping
+                  0           => 'schema1.table1', //table name
+                  'table1_id' => 'id', //foreign key
+              ],
+              1 => 'schema1.junction1.j1_table1_fkey' //New: Name of the foreign key
+          ],
+      ],
+  ];
+  ```
+