CODEWITHSUNDEEP
ruby-on-railsrubyactiverecord
user5402808
user5402808

Reputation:

Relationship for a user to store “favorites” in ruby on rails?

I have a Rails application where a User can create many Articles:

class User < ActiveRecord::Base
  has_many :articles
end

class Article < ActiveRecord::Base
  belongs_to :user
end

Now I want to save user favorites. But I can't figure out a structure for how to manage user favorites within the existing sturcture. Should I make a new many to many relation?

Or will I have to change the entire structure?

Upvotes: 0

Views: 597

Answers (2)

akbarbin
akbarbin

Reputation: 5105

You'd better to add new model favorite.rb where it belongs to User and Article. This table will save article and user id

First, you can add migration

rails generate model Favorite user_id:integer article_id:integer

Then, you can add association here

class Favorite < ActiveRecord::Base
  belongs_to :user
  belongs_to :article
  validates_uniqueness_of :user_id, scope: :article_id
end

class User < ActiveRecord::Base
  has_many :articles
  has_many :favorites
  has_many :favorite_articles, through: :favorites, source: :article
end

class Article < ActiveRecord::Base
  belongs_to :user
  has_many :favorites
end

In User model, there is favorite_articles to get your user favorite articles. Then, you can add validate uniqueness of user_id with scope article_id to ovoid double entry.

To add favorite article user controller

def add_favorite
  @favorite = current_user.favorites.build(article_id: params[:article_id])
  if @favorite.save
    flash[:notice] = "Added a new favorite article."
    redirect_to root_url
  else
   flash[:error] = "Unable to add favorite article."
   redirect_to root_url
 end
end

To get user favorite articles

current_user.favorite_articles

UPDATE I change class_name into source: :article. Then, I create new def method to add favorite in users_controller.rb

This is what I want to describe. I hope this help you.

Upvotes: 0

dimakura
dimakura

Reputation: 7655

Your current setup is Article - Author (user) relation and you should not change it.

What you need to add, to support favorites, is a new table (model):

class UserAtricles
  belongs_to user
  belongs_to article
end

which will create many-to-many relationship between Users and Articles.

class User
  has_many :articles
  has_many :user_articles
  has_many :favorites, through: :user_acticles, class_name: 'Article'

  # Add favorite article to the instance of User.
  def add_favorite(article)
    if self.favorites.where(id: article.id).empty?
      UserArticle.create(user: self, article: article)
    end
  end
end

Upvotes: 3

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