CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-3
user896715
user896715

Reputation: 109

rails model association problem

im working on this model association class assignment. the basic association works, but im having issue with the "category"-page view.

Category Page Output should be (/categories/1)

rules: - dish belongs to one category - same dish can be in multiple restaurants

class Category < ActiveRecord::Base
  has_many :dishes
end

class Dish < ActiveRecord::Base
  belongs_to :category
end

class Restaurant < ActiveRecord::Base
  has_and_belongs_to_many :dishes
end

class DishRestaurant < ActiveRecord::Base
  has_many  :restaurants
  has_many  :dishes
end

Category Controller

def show
  @category = Category.find(params[:id])
  @dishes = @category.dishes
  // RESTAURANT TITLE ??

respond_to do |format|
  format.html # index.html.erb
  format.xml  { render :xml => @category }
end

Category View: <%= debug @dishes %>

any hint would be helpful.

thanks

pete

Upvotes: 0

Views: 141

Answers (1)

rubish
rubish

Reputation: 10907

Define you models properly:

class Dish < ActiveRecord::Base
  belongs_to :category
  has_and_belongs_to_many :restaurants
end

class Restaurant < ActiveRecord::Base
  has_and_belongs_to_many :dishes
end

This would use the implicit join table names "dishes_restaurants". You only need a join model is you store some join specific information, like price of the dish in the restaurant. In which case you models should be like:

class Dish < ActiveRecord::Base
  belongs_to :category
  has_many :dish_restaurants
  has_many :restaurants, through => :dish_restaurants
end

class Restaurant < ActiveRecord::Base
  has_many :dish_restaurants
  has_many :dishes, through => :dish_restaurants
end

class DishRestaurant < ActiveRecord::Base
  belongs_to  :restaurant
  belongs_to  :dish
end

Whatever approach you follow, you can do dish.restaurants to retrieve the list of the restaurants which serve the dish.

Upvotes: 1

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