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namespace配下でform_forを使う方法

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ルータでnamespaceを区切ったコントローラでform_forを使う場合、form_forが期待するリクエスト先URLにnamespace名を挟むには以下のように書けば良い。

(ex exampleモデルを扱うdashboard/examplesコントローラの場合

config/routes.rb
namespace 'dashbord' do
  resources :examples
end
controller/dashboard/examples_controller.rb
class Dashboard::ExampleController < ApplicationController

  def new
    @example = Example.new
  end

  

end
view/dashboard/examples/_form.html.erb
<%= form_for [:dashboard, @example] do |f| %>
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