CODEWITHSUNDEEP
ruby-on-railshas-and-belongs-to-many
datisdesign
datisdesign

Reputation: 3195

rails habtm relation

I have 2 models which have a has_and_belongs_to_many relation:

class Category < ActiveRecord::Base
  has_and_belongs_to_many :templates
end

class Template < ActiveRecord::Base
  has_and_belongs_to_many :categories
end

I want to know how can I get a category name through this relation, for example I find a first template:

t = Template.find(:first)

Then using t.categories will return an object, but I want to have category.name in return, how can I achieve this?

Upvotes: 0

Views: 451

Answers (3)

John Topley
John Topley

Reputation: 115392

To get the names of the categories associated with your first Template instance, you can do:

Template.first.categories.collect(&:name)

—This uses the Symbol#to_proc support that Rails adds. More information in this Railscast.

Upvotes: 3

khelll
khelll

Reputation: 24020

Supposing that a category record has the name field you can do:

t.categories.map(&:name)

Upvotes: 0

Jordan Running
Jordan Running

Reputation: 106077

t.categories.first.name

Upvotes: 0

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