Rails - Sep 2014 - Setting the default form builder

Hi,

I implemented a custom form builder called BootstrapFormBuilder. I wanted 
to use it as the default form builder. I did manage to do that but not 
without problems. I'd like you to help me understand why my initial 
approach didn't work.

I put my class in app/helpers/bootstrap_form_builder.rb. Following the 
Rails Guide I added:

Rails.application.config.action_view.default_form_builder = 
BootstrapFormBuilder

to an initializer. Unfortunately form_for was still using the default form 
builder. I had to change the line above to:

ActionView::Base.default_form_builder = BootstrapFormBuilder

That approach worked. I have two questions:

1. why didn't my initial approach work?
2. if it doesn't change the default form builder then what does it do?

Regards
--
Greg

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