Relation has_and_belongs_to_many doesn't save data

Question

I've migration tags_words

class CreateTagsWords < ActiveRecord::Migration
  def change
    create_table :tags_words, id: false do |t|
       t.references :tag
       t.references :word
     end
     add_index :tags_words, :tag_id
     add_index :tags_words, :word_id
  end
end

model words and tags:

class Word < ActiveRecord::Base
    attr_accessible :namelanguage1, :namelanguage2, :tags_attributes

    has_and_belongs_to_many :tags

    def self.search(search)
        if search
            find(:all, :conditions => ['namelanguage1 LIKE ?', "%#{search}%"])
        else
            find(:all)
        end
    end
end

class Tag < ActiveRecord::Base
    attr_accessible :name, :language_user_id

    has_and_belongs_to_many :words

    def self.search(search)
        if search
            find(:all, :conditions => ['name LIKE ?', "%#{search}%"])
        else
            find(:all)
        end
    end
end

and when I'll add tags to words and then save it doesn't save in db (when I write in rails console Words.find(1).tags i get empty array.

Answer 1

You'd need to use the << ActiveRecord method to add to the respective collections you have:

#app/controllers/words_controller.rb
def add_tag
    word = Word.find(params[:id])
    tag = Tag.find(params[:id])

    word.tags << tag
end

Your problem will either be caused by you not saving your data correctly, or not calling it properly

---

Update

If you want to add tags to the word's tags collection after you've created a new word, you'll be able to do something like this:

#app/controllers/words_controller.rb
def create
    @word = Word.new(word_params)
    @word.save
end

private

def word_params
    params.require(:word).permit(:namelanguage1, :namelanguage2, tag_ids: [])
end

#app/models/word.rb
Class Word < ActiveRecord::Base
    attr_accessor :tag_ids
    after_create :add_tags

    def add_tags
       if tag_ids
           tag = Tag.find(tag_ids)
           tags << tag
       end
    end
end