Uninitialized constant ActionView::Helpers::InstanceTag in Rails 4 -

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i have following code, use customize form_for. need inherit actionview::helpers::instancetag 

class instancetag < actionview::helpers::instancetag

i exception after upgrade rails 4 , saw in docs there no such class. best class use instead of it?

after research. found 

actionview::helpers::instancetag

is transformed module called activemodelinstancetag

actionview::helpers::activemodelinstancetag

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