CODEWITHSUNDEEP
ruby-on-railsrubyassociations
Loenvpy
Loenvpy

Reputation: 919

Select category: Rails 4 many to many association

Sorry for my English

I have a create many to many association between articles and categories

this is my article model

class Article < ActiveRecord::Base
    has_many :categorizations
    has_many :categories, through: :categorizations
end

this is my category model

class category < ActiveRecord::Base
    has_many :categorizations
    has_many :articles, through: :categorizations
end

in this my categorization model

class Categorizations < ActiveRecord::Base
    belongs_to :article
    belongs_to :category
end

then I have create the categories names in the Seed file

but I try to get the categories in a select but I get this Error

undefined method category_id' for <%= f.collection_select :category_id, Category.all, :id, :name, :include_blank => true %>

Upvotes: 1

Views: 1435

Answers (1)

user3330161
user3330161

Reputation:

Just change <%= f.collection_select :category_id, Category.all, :id, :name, :include_blank => true %> to <%= f.collection_select :category_ids, Category.all, :id, :name, :include_blank => true %>

Upvotes: 4

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