Has and belongs to many

rubyonrails-talk
1

Hi everyone.

I've got the following in my model:

class Newsletter < ActiveRecord::Base   has_and_belongs_to_many :tags

  def tag_attributes=(tag_attributes)     tag_attributes.each do |attributes|       tags.build(attributes)     end   end end

class Tag < ActiveRecord::Base     has_and_belongs_to_many :newsletters end

And I also got a newsletters_tags relationship table in my DB, containing newsletter_id and tag_id (both fields are set as primary_key)

How do I perform a search to retrieve every tag within a particular newsletter, or all newsletters that relates to an specific tag?

2

Daniel Drehmer wrote:

How do I perform a search to retrieve every tag within a particular newsletter,

my_newsletter.tags

or all newsletters that relates to an specific tag?

my_tag.newsletters

3

@tag.newsletters or @newsletter.tags

Julian.

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