Using Rails 3.2 and having a lot of trouble with Active Admin's has_many :through. The goal is to pull in the has_many :through subcategories through the contents model and create checkboxes for all of the subcategories. I've read the Active Admin documentation, searched other articles on stack, github, etc. Nothing is working. My only guess there could be something with the "form :html => { :enctype => "multipart/form-data" } do |f|" tag, which I need for PaperClip.
*I've tried using accepts_nested_attributes and it doesn't work...
There is a has_many :through table for subcategories and contents. Here is what it looks likes in the database:
create_table "contents", :force => true do |t|
t.string "title"
t.text "short_description"
t.text "long_description"
t.datetime "published_date"
t.datetime "edited_date"
t.string "read_length_time"
t.string "tag"
t.integer "author_id"
t.integer "contenttype_id"
t.string "collection"
t.integer "collection_id"
t.string "subcategory"
t.integer "subcategory_id"
t.boolean "published"
t.datetime "created_at", :null => false
t.datetime "updated_at", :null => false
t.string "image_file_name"
t.string "image_content_type"
t.integer "image_file_size"
t.datetime "image_updated_at"
t.string "infographic_file_name"
t.string "infographic_content_type"
t.integer "infographic_file_size"
t.datetime "infographic_updated_at"
t.string "video"
end
create_table "subcategories", :force => true do |t|
t.string "title"
t.integer "category_id"
t.string "content"
t.integer "content_id"
t.datetime "created_at", :null => false
t.datetime "updated_at", :null => false
end
create_table "subcats_contents", :id => false, :force => true do |t|
t.integer "subcategory_id"
t.integer "content_id"
end
add_index "subcats_contents", ["content_id"], :name => "index_subcats_contents_on_content_id"
add_index "subcats_contents", ["subcategory_id", "content_id"], :name => "index_subcats_contents_on_subcategory_id_and_content_id"
add_index "subcats_contents", ["subcategory_id"], :name => "index_subcats_contents_on_subcategory_id"
Here are the models:
class Content < ActiveRecord::Base
attr_accessible :author,
:edited_date,
:image,
:long_description,
:published_date,
:read_length_time,
:short_description,
:tag,
:title,
:type,
:collection_id,
:collection,
:collections_content,
:image,
:author_id,
:contenttype_id,
:subcategory,
:image_file_name,
:image_content_type,
:image_file_size,
:image_updated_at,
:subcats_contents,
:published,
:infographic_file_name,
:infographic_content_type,
:infographic_file_size,
:infographic_updated_at,
:infographic,
:video
has_many :collections_contents
has_many :collections, :through => :collections_contents
has_many :subcats_contents
has_many :subcategories, :through => :subcats_contents
belongs_to :author
belongs_to :contenttype
validates_presence_of :title
validates_presence_of :author_id
validates_presence_of :published_date
validates_presence_of :read_length_time
validates_presence_of :contenttype
validates_presence_of :tag
validates :published, inclusion: [true, false]
has_attached_file :image, :styles => { :medium => "500x800>", :thumb =>"500x500>" }
has_attached_file :infographic, :styles => { :medium => "1000x1000>", :thumb =>"300x300>" }
scope :published, where(:published => true )
scope :unpublished, where(:published => false )
end
class Subcategory < ActiveRecord::Base
attr_accessible :category,
:category_id,
:content,
:content_id,
:title,
:subcats_contents
has_many :subcats_contents
has_many :contents, :through => :subcats_contents
belongs_to :category
end
class SubcatsContent < ActiveRecord::Base
attr_accessible :subcategory,
:content
belongs_to :subcategory
belongs_to :content
end
Then in my active admin form I've tried everything... here is the current state:
ActiveAdmin.register Content do
scope :all, :default => true
scope :published
scope :unpublished
filter :author
filter :contenttype, :label => "Content Type"
filter :title
filter :short_description, :label => "Summary"
filter :long_description, :label => "Content Body"
filter :published_date
filter :tag, :label => "Tags"
filter :subcategory, :label => "Subcategories"
filter :image_file_name
index do
column :published
column :title
column :author
column :published_date
column :short_description, :label => "Summary"
column :long_description, :label => "Content Body"
column :image_file_name, :label => "Image"
column :tag
actions
end
form :html => { :enctype => "multipart/form-data" } do |f|
f.inputs "Contents" do
f.input :published, :as => :select
f.input :title
f.input :short_description, :label => "Summary"
f.input :long_description, :label => "Content Body"
f.input :read_length_time, :label => "Estimated Read Length Time"
f.input :author
f.input :contenttype, :label => "Type of Content"
f.input :image, :as => :file
f.input :infographic, :as => :file
f.input :video, :label => "Video * Please add the embed code (not just the URL)"
f.input :tag, :label => "Tags"
f.input :published_date
f.input :subcategory, :as => :select, :input_html => { :multiple => true }
end
f.has_many :subcatscontents do |app_f|
app_f.inputs "Subcats Contents" do
app_f.input :subcategories
end
end
f.buttons
end
end
Here is the error I get in Active Admin when I go to create a new content: undefined method `klass' for nil:NilClass
Thanks for any help and I apologize in advance if something isn't semantically up to par - new to this site.
