Anonymous wrote:
I have an app where users upload images and tag them:
class Image < ActiveRecord::Base has_many :taggings, :dependent => :destroy has_many :tags, :through => :taggings end
class Tag < ActiveRecord::Base has_many :images, :through => :taggings has_many :taggings, :dependent => :destroy end
class Tagging < ActiveRecord::Base belongs_to :image belongs_to :tag end
Before I was using HABTM for this kind of setup, but then I wanted to have the status of the tag in the join table. In my app, tags are disabled after a certain amount of time (I know it sounds strange). So I read that has_many :through was what you're supposed to use if you want a join table with extra info in it.
I was hoping that by adding the table column "disabled" to the taggings table I could do something like: post.tags[0].disabled, and get a result, but I guess that's not how AR operates.
So I figured I would write a method for the Tag model that would provide the same functionality, so I could do post.tags[0].disabled? or post.tags[0].enabled? and get the status of the tag in relation to the calling post. I can't figure out how to write such a method, though. I can't figure out how Tag object is supposed to know what Image object is calling it; it seems to get lost in the intermediary table Tagging.
Any help would be appreciated. I'm baffled. Perhaps I am approaching the entire situation wrong.
(Also, before anyone asks, I chose not to use acts_as_taggable because a) I hate using prepackaged code, it makes my application feel cheap and cookie-cutter-ish, b) it didn't provide precisely the functions that I needed and I didn't feel like hacking it.)
It works for me:
>> image = Image.find(1) => #<Image:0x2aaaad5133d0 @attributes={"name"=>"image1.jpg", "id"=>"1"}> >> image.tags => [#<Tag:0x2aaaad50eab0 @attributes={"name"=>"panda", "id"=>"1"}>, #<Tag:0x2aaaad50e9c0 @attributes={"name"=>"forest", "id"=>"3"}>] >> image.taggings => [#<Tagging:0x2aaaad509948 @attributes={"tag_id"=>"1", "id"=>"1", "disabled"=>"0", "image_id"=>"1"}>, #<Tagging:0x2aaaad509920 @attributes={"tag_id"=>"3", "id"=>"3", "disabled"=>"1", "image_id"=>"1"}>] >> image.taggings[0].disabled => 0 >> image.taggings[1].disabled => 1