Suppose I have one table:
states
id
statename
And I have two other tables that contains states:
houses
id
color
state_id
places
id
place_name
state_id
How would my model relationships look like?
class State < ActiveRecord::Base
belongs_to house
belongs_to place
end
class House < ActiveRecord::Base
has_one state
end
class Place < ActiveRecord::Base
has_one state
end
Is that right? Can I have a model that belongs to multiple models?
--
Vincent H Gov
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On 3/22/06, Vincent Gov <vincehgov@gmail.com> wrote:> Suppose I have one table: > > states > id > statename > > And I have two other tables that contains states: > > houses > id > color > state_id > > places > id > place_name > state_id > > How would my model relationships look like? > > class State < ActiveRecord::Base > belongs_to house > belongs_to place > end > > class House < ActiveRecord::Base > has_one state > end > > class Place < ActiveRecord::Base > has_one state > end > > Is that right? Can I have a model that belongs to multiple models? >You can have as many belongs_to associations as you want in one model, but you don''t want that with the table structure you sketched out. The ActiveRecord setup you want is probably: class State < ActiveRecord::Base has_one :place has_one :house end class Place < ActiveRecord::Base belongs_to :state end class House < ActiveRecord::Base belongs_to :state end Put "belongs_to :name" in the class that wraps a table containing a "name_id" column. --Wilson.
That should probably be class State <ActiveRecord::Base has_many :places has_many :houses end Unless you only want one house and one place per state... On 3/23/06, Wilson Bilkovich <wilsonb@gmail.com> wrote:> > On 3/22/06, Vincent Gov <vincehgov@gmail.com> wrote: > > Suppose I have one table: > > > > states > > id > > statename > > > > And I have two other tables that contains states: > > > > houses > > id > > color > > state_id > > > > places > > id > > place_name > > state_id > > > > How would my model relationships look like? > > > > class State < ActiveRecord::Base > > belongs_to house > > belongs_to place > > end > > > > class House < ActiveRecord::Base > > has_one state > > end > > > > class Place < ActiveRecord::Base > > has_one state > > end > > > > Is that right? Can I have a model that belongs to multiple models? > > > > You can have as many belongs_to associations as you want in one model, > but you don''t want that with the table structure you sketched out. > > The ActiveRecord setup you want is probably: > class State < ActiveRecord::Base > has_one :place > has_one :house > end > > class Place < ActiveRecord::Base > belongs_to :state > end > > class House < ActiveRecord::Base > belongs_to :state > end > > Put "belongs_to :name" in the class that wraps a table containing a > "name_id" column. > > --Wilson. > _______________________________________________ > Rails mailing list > Rails@lists.rubyonrails.org > http://lists.rubyonrails.org/mailman/listinfo/rails >-------------- next part -------------- An HTML attachment was scrubbed... URL: http://wrath.rubyonrails.org/pipermail/rails/attachments/20060323/95acefa5/attachment.html
Sorry, bad example. I just wanted to know if i can have multiple belongs_to statements. Thanks guys On 3/22/06, Liquid <has.sox@gmail.com> wrote:> > That should probably be > class State <ActiveRecord::Base > has_many :places > has_many :houses > end > > Unless you only want one house and one place per state... > > > > > On 3/23/06, Wilson Bilkovich <wilsonb@gmail.com> wrote: > > > > On 3/22/06, Vincent Gov <vincehgov@gmail.com> wrote: > > > Suppose I have one table: > > > > > > states > > > id > > > statename > > > > > > And I have two other tables that contains states: > > > > > > houses > > > id > > > color > > > state_id > > > > > > places > > > id > > > place_name > > > state_id > > > > > > How would my model relationships look like? > > > > > > class State < ActiveRecord::Base > > > belongs_to house > > > belongs_to place > > > end > > > > > > class House < ActiveRecord::Base > > > has_one state > > > end > > > > > > class Place < ActiveRecord::Base > > > has_one state > > > end > > > > > > Is that right? Can I have a model that belongs to multiple models? > > > > > > > You can have as many belongs_to associations as you want in one model, > > but you don''t want that with the table structure you sketched out. > > > > The ActiveRecord setup you want is probably: > > class State < ActiveRecord::Base > > has_one :place > > has_one :house > > end > > > > class Place < ActiveRecord::Base > > belongs_to :state > > end > > > > class House < ActiveRecord::Base > > belongs_to :state > > end > > > > Put "belongs_to :name" in the class that wraps a table containing a > > "name_id" column. > > > > --Wilson. > > _______________________________________________ > > Rails mailing list > > Rails@lists.rubyonrails.org > > http://lists.rubyonrails.org/mailman/listinfo/rails > > > > > _______________________________________________ > Rails mailing list > Rails@lists.rubyonrails.org > http://lists.rubyonrails.org/mailman/listinfo/rails > > >-- Vincent H Gov -------------- next part -------------- An HTML attachment was scrubbed... URL: http://wrath.rubyonrails.org/pipermail/rails/attachments/20060323/0703e66d/attachment-0001.html
Is it correct to say that the has_one relations are not necessary unless you are going to be reading the state table and want to get all the houses that are in that state? I.e. state.houses On Wednesday, March 22, 2006, at 10:06 PM, Wilson Bilkovich wrote:>On 3/22/06, Vincent Gov <vincehgov@gmail.com> wrote: >> Suppose I have one table: >> >> states >> id >> statename >> >> And I have two other tables that contains states: >> >> houses >> id >> color >> state_id >> >> places >> id >> place_name >> state_id >> >> How would my model relationships look like? >> >> class State < ActiveRecord::Base >> belongs_to house >> belongs_to place >> end >> >> class House < ActiveRecord::Base >> has_one state >> end >> >> class Place < ActiveRecord::Base >> has_one state >> end >> >> Is that right? Can I have a model that belongs to multiple models? >> > >You can have as many belongs_to associations as you want in one model, >but you don''t want that with the table structure you sketched out. > >The ActiveRecord setup you want is probably: >class State < ActiveRecord::Base > has_one :place > has_one :house >end > >class Place < ActiveRecord::Base > belongs_to :state >end > >class House < ActiveRecord::Base > belongs_to :state >end > >Put "belongs_to :name" in the class that wraps a table containing a >"name_id" column. > >--Wilson. >_______________________________________________ >Rails mailing list >Rails@lists.rubyonrails.org >http://lists.rubyonrails.org/mailman/listinfo/rails-- Posted with http://DevLists.com. Sign up and save your time!