Hi, How could i test if the property with a certain name, is a foreign key (the foreign key relation is declared in the model, not in the table) example: belongs_to :city, :class_name => "City", :foreign_key => "CITY_ID" - my property for this example is "CITY_ID" - i don''t want to test if it has "_id" in the name, the properties that are foreign keys may not respect the Class_id rule, further if i find that it''s a foreign key, how cand i found the related class.? - is there an API command for this? -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
You may find this project interesting. http://drysql.rubyforge.org/features.htm Paolo On 30/01/07, P. Pantouffe <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> > Hi, > > How could i test if the property with a certain name, is a foreign key > (the foreign key relation is declared in the model, not in the table) > > example: > belongs_to :city, :class_name => "City", :foreign_key => "CITY_ID" > > - my property for this example is "CITY_ID" > - i don''t want to test if it has "_id" in the name, the properties > that are foreign keys may not respect the Class_id rule, further if i > find that it''s a foreign key, how cand i found the related class.? > - is there an API command for this? > > -- > Posted via http://www.ruby-forum.com/. > >--~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
From what i''ve read, right on the first page they are going the other way I want. Due to the nature of the project i must put the relation in the model, i''m not allowed to modify the database schema.(and the schema does not have de fk specified). -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
On 1/30/07, P. Pantouffe <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> > From what i''ve read, right on the first page they are going the other > way I want. Due to the nature of the project i must put the relation in > the model, i''m not allowed to modify the database schema.(and the schema > does not have de fk specified). > > > > -- > Posted via http://www.ruby-forum.com/. > > > >Reflecting on associations might get you halfway there: class Account < AR has_many :users end>> Account.reflect_on_association :users=> #<ActiveRecord::Reflection::AssociationReflection:0x202491c @active_record=Account, @primary_key_name="account_id", @macro=:has_many, @name=:users, @options={}> Account.reflections will show you all associations Fire up ./script/console and play around. Hope this helps. -- Zack Chandler http://depixelate.com --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
thank u for the anser, does rails has equivalent for my functions?
# knowing an attribute name i want to know if it is used in a belong to
relation
def self.attribute_links_to_a_class?(aatribute)
larray = reflect_on_all_associations(:belongs_to)
lreturn = false
larray.map {|n| if n.primary_key_name.eql?(aatribute);lreturn=true
end}
lreturn
end
# knowing an attribute name i want the linked class to be returned
def self.if_attribute_links_to_a_class_return_class(aatribute)
larray = reflect_on_all_associations(:belongs_to)
lreturn = nil
larray.map {|n| if
n.primary_key_name.eql?(aatribute);lreturn=larray.index(n) end}
if lreturn
return Object.const_get(larray[lreturn].class_name.humanize)
else
return nil
end
end
--
Posted via http://www.ruby-forum.com/.
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On 1/31/07, P. Pantouffe <rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> > thank u for the anser, does rails has equivalent for my functions? > > # knowing an attribute name i want to know if it is used in a belong to > relation > > def self.attribute_links_to_a_class?(aatribute) > larray = reflect_on_all_associations(:belongs_to) > lreturn = false > larray.map {|n| if n.primary_key_name.eql?(aatribute);lreturn=true > end} > lreturn > endHere is a one liner that is simpler. self.reflect_on_all_associations(:belongs_to).map{ |r| r.primary_key_name }.include?(attr)> > # knowing an attribute name i want the linked class to be returned > > def self.if_attribute_links_to_a_class_return_class(aatribute) > larray = reflect_on_all_associations(:belongs_to) > lreturn = nil > larray.map {|n| if > n.primary_key_name.eql?(aatribute);lreturn=larray.index(n) end} > if lreturn > return Object.const_get(larray[lreturn].class_name.humanize) > else > return nil > end > endThis syntax might be better suited for your second method: User.reflections[:account].class_name.constantize Keep in mind that if the relation is of certain types like :through or :polymorphic then the class_name() method will throw an error. You''ll need to check the options {} on the reflection: reflection.options[:polymorphic] || reflection.options[:through] It might help to play around in ./script/console with your models to check out the varying behaviour. -- Zack Chandler http://depixelate.com --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---