I like has_many through with a CatalogEntry join model.
## example Page call ##
Page.last.chapter.book.subjects.first
## models ##
class CatalogEntry < ActiveRecord::Base
belongs_to :subject
belongs_to :book
end
class Book < ActiveRecord::Base
has_many :catalog_entries
has_many :subjects, :through => :catalog_entries
has_many :chapters
end
class Subject < ActiveRecord::Base
has_many :catalog_entries
has_many :books, :through => :catalog_entries
end
class Chapter < ActiveRecord::Base
belongs_to :book
has_many :pages
end
class Page < ActiveRecord::Base
belongs_to :chapter
end
## seeds.rb ##
subject01 = Subject.create!(:name => 'Subject One')
subject02 = Subject.create!(:name => 'Subject Two')
book01 = Book.create!(:name => 'Book One')
book02 = Book.create!(:name => 'Book Two')
book01_chapter01 = Chapter.create!(:book => book01, :name => 'Chapter One')
book01_chapter02 = Chapter.create!(:book => book01, :name => 'Chapter Two')
book02_chapter01 = Chapter.create!(:book => book02, :name => 'Chapter One')
book02_chapter02 = Chapter.create!(:book => book02, :name => 'Chapter Two')
book01_chapter01_page01 = Page.create!(:chapter => book01_chapter01,
:number => 1)
book01_chapter02_page02 = Page.create!(:chapter => book01_chapter02,
:number => 2)
book02_chapter01_page01 = Page.create!(:chapter => book02_chapter01,
:number => 1)
book02_chapter02_page02 = Page.create!(:chapter => book02_chapter02,
:number => 2)
book01.subjects << subject01
book01.subjects << subject02
book01.save
book02.subjects << subject01
book02.subjects << subject02
book02.save
On 06/22/2011 10:08 AM, rajeevkannav wrote:
Hello All
I am working on my new project. in that my requriments are like this
Subjects have many books, book belongs to subjects
Books have many Chapters, Chapter belongs to Books
Chapter have many pages, page belongs to Chapters
Is that fine or it could be done better Ways
Thanks in advance
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