fileprg don't work with file collections

[weierophinney]

zendframework/zendframework#6483

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Originally posted by @vincequeiroz at zendframework/zend-mvc-plugin-fileprg#7

[weierophinney]

Same problem for me.
To solve it (without modify orginal class) i've created a new controller plugin with the modifications explained in bug#6483.

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Originally posted by @gregGit at zendframework/zend-mvc-plugin-fileprg#7 (comment)