Flowdock
method

new

Importance_1
new(context = nil, assigns = {}, controller = nil, formats = nil) public

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April 17, 2018
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When using ActionView::Base.new to render templates views

when calling this method to render templates to a string. in order to use any helper methods you need to add them to the view like this

view = ActionView::Base.new(ActionController::Base.view_paths, {})
view.class_eval do  
  # include any needed helpers (for the view)
  include ApplicationHelper
end 

source: http://peden.biz/rendering-a-rails-view-from-a-script/