adding category selectors to active admin

posts.rb

index do
  column :title, :sortable => :title do |post|
    link_to post.title, [:edit_admin, post]
  end
  
  column :categories do |post|
    table_for post.categories.order('title ASC') do
      column do |category|
        link_to category.title, [ :admin, category ]
      end
    end
  end
  default_actions
end

show do
  attributes_table do
    row :title
    row :content
    table_for post.categories.order('title ASC') do
      column "Categories" do |category|
        link_to category.title, [ :admin, category ]
      end
    end
  end
end

form do |f|
  f.inputs "Add/Edit Post" do
    f.input :title
    f.input :content
    f.input :categories, :as => :check_boxes      
  end
  f.buttons
end

Hello Chewy,

a little late for an answer after 3 months, but you can provide a :member_label => :name parameter to point to another method on the models within the collection. In your case it would be

f.input :categories, :as => :check_boxes, :member_label => :description

I got this information from the formtastic sources used by Active Admin

https://github.com/justinfrench/formtastic/blob/master/lib/formtastic/inputs/check_boxes_input.rb

Regards,
Karsten

I am doing my first Rails app and have a join table that is used for many-to-many relationships of Recipes and their Categories. For the join table to work, I have read on other blogs not to have auto-incrementing IDs on each table line. So the join table has only category_id and recipe_id. Now standard RESTful routing for editing an item is to pass an ID for the record. Without any IDs, how can I create an edit page for the lines in this join table? Thanks for any assistance.