Question

I have 2 activeadmin resources, both are subclasses of a model, using STI. For example:

base_model.rb

class BaseModel < ActiveRecord::Base

end

male_model.rb

class MaleModel < BaseModel

end

female_model.rb

class FemaleModel < BaseModel

end

admin/male_model.rb

ActiveAdmin.register MaleModel do
  menu :parent => "Models", :label => "Male Model"

  # A big long custom form follows...
  form do |f|
    f.inputs
    f.buttons
  end
end

admin/female_model.rb

ActiveAdmin.register FemaleModel do
  menu :parent => "Models", :label => "Female Model"

  # The SAME big long custom form follows...
  form do |f|
    f.inputs
    f.buttons
  end
end

What would be the correct way to render the same form, but create a record of a different subclass, either MaleModel or FemaleModel?

What I’m doing now is maintaining 2 activeadmin resources with almost exactly the same (bulky) code within. Totally unDRY. Please share what you’ve done in this situation.

John

Answer 1

I haven’t try this but you could define an @object variable in the controller:

controller do
    before_filter :set_object, :only => [:new, :edit]
    ....
    def set_object
        @object = MaleModel.find(params[:id]) rescue MaleModel.new
    end
end

And then you could render a form and use the variable @object instead of @male_model or @female_model.

form :partial => "models/form"

# app/views/models/_form.html.erb
<%= semantic_form_for [:admin, @object] do |f| %>
    <%= f.inputs %>
    <%= f.actions %>
<% end %>