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I'm using a form(parent form) with a collection field type(child forms). Each type in the collection is a form that contains some choice fields, I want to filter this field choices using query_builder parameter for join with other entities ect. I know how to pass parameters to parent form from controller, but how to pass parameters to each item in the collection (child forms)?

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    By "parameters" do you mean the $options array that's passed to buildForm()? Commented May 17, 2012 at 17:43
  • Here is something worth trying out: stackoverflow.com/a/20229988/583786 Commented Jun 18, 2014 at 9:59

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What you want is a data transformer. The data transformer takes data from your sub forms allows you to do queries to the database from inside it and pass 1 final result out the end. I had to do this the other day with country and postal code to find a valid postal code in a country.

Here's the link to the cookbook info that will show you how to use it.

http://symfony.com/doc/current/cookbook/form/data_transformers.html

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Here is my answer: https://stackoverflow.com/a/17223519/1756517

In each form, pass the variable by the construct method ($form = new FormType($your_variable);)

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A bit late response, but with Symfony3, you should use the entry_options parameter as mentioned here. It was exactly what I needed, in scenario similar to yours.

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