addPrimaryKey() function not working

[Josexato]

This is a (multiple allowed):

• bug

• enhancement

• feature-discussion (RFC)

• CakePHP Version: 3.5.10

• Migrations plugin version: 1.7.2

• Bake plugin version (if relevant): 1.6.0

• Database server (MySQL, SQLite, Postgres): 5.7.20-0ubuntu0.16.04.1

• PHP Version: PHP 7.0.22-0ubuntu0.16.04.1

• Platform / OS: ubuntu0.16.04.1

What you did

I wanted to add a primary key composed by two columns so I created this $this->table('books_words')->addPrimaryKey(['books_id','word_id'])->update();

(full code at https://github.com/Josexato/cakephp_sandbox/blob/ac1edbbf26ebcd16508497adcfe3c105b6cf3967/config/Migrations/20180108172304_AddedPrimaryKeys.php#L11)

Expected Behavior

basically I expected to see something like in the debug ALTER TABLE 'books_words' ADD PRIMARY KEY( 'word_id', 'book_id');

Actual Behavior

The update function did not take into account the "primaryKey" attribute, I added a column just to test if it was working properly and found that the column is added but no primary key is added
(log at https://gist.github.com/Josexato/aa9f8d11ea331b78ad72dfa17725c43c)

I've looked for a functions among the adapters that does somthing the "primaryKey" attribute and I've only found this https://github.com/cakephp/phinx/blame/master/src/Phinx/Db/Adapter/MysqlAdapter.php#L264 in the "createTable()" but no action is taken for update and "primaryKey".

[dereuromark]

Is this still an issue in 0.12?