extend collections from multiple modules

[Perfect-Web]

I saw in every example how to define a collection per module.
However when i tried to extend a collection defined in one module with another one from other module, it doesn't work

`

'AsseticBundle' => array(

            'root_path' => getcwd(),

            'collections' => array(

                'head_base_js' => array(
                    'assets' => array(
                        'vendor/jquery/dist/jquery.min.js'

.........

        'Application' => array(
            'root_path' => __DIR__ . '/../assets',
            'collections' => array(
                'head_base_js' => array(
                    'assets' => array(
                        'js/app.js',
                    ),
                ),

.......
`

I have tried multiple combinations, none of which worked.

[widmogrod]

Is impossible to merge them like that.
What you could do is to create in each module shared configuration like.

Module A:

return [
  'assetic_configuration' => [
    'modules' => [
      'shared_between' => [
        'collections' => [
          'head_base_js' => [
             'vendor/jquery/dist/jquery.min.js'
          ],
        ],
      ],
      'module_a_specific' => [
        'collections' => [
          'head_base_js' => [/*...*/],
        ],
      ],
    ],
  ],
]

Module B:

return [
  'assetic_configuration' => [
    'modules' => [
      // shared
      'shared_between' => [
        'collections' => [
          'head_base_js' => [
             'js/app.js',
          ],
        ],
      ],
      'module_b_specific' => [
        'collections' => [
          'head_base_js' => [/*...*/],
        ],
      ],
    ],
  ],
]

[Perfect-Web]

Ok, but shared_between is relative to what ? could you give more examples or a link to the code so i can understand how this works ?

[widmogrod]

Yes, shared_between is relative to that.
When ZF2 merges configs from two modules, it will produce array like this:

eturn [
  'assetic_configuration' => [
    'modules' => [
      'shared_between' => [
        'collections' => [
          'head_base_js' => [
             'vendor/jquery/dist/jquery.min.js',
              'js/app.js',
          ],
        ],
      ],
      'module_a_specific' => [
        'collections' => [
          'head_base_js' => [/*...*/],
        ],
      ],
      'module_b_specific' => [
        'collections' => [
          'head_base_js' => [/*...*/],
        ],
      ],
    ],
  ],
]

I don't have any real world example like this.
You need to understand it by yourself.