Scott
2007-Nov-29 05:48 UTC
collection.build or collection.create gives "ArgumentError: wrong number of arguments (1 for 0)"
I have a Project that has_many Tasks. Tasks belongs to a Project. When I try the following: project = Project.new project.tasks.build I get:>> s = Project.new=> #<Project:0x25f9e28 @attributes={"name"=>"", "end_at"=>nil, "updated_at"=>nil, "published_at"=>nil, "user_id"=>nil, "created_at"=>nil}, @new_record=true>>> s.tasks.buildArgumentError: wrong number of arguments (1 for 0) from /Applications/Locomotive2/Bundles/ standardRailsMar2007.locobundle/i386/lib/ruby/gems/1.8/gems/ activerecord-1.15.3/lib/active_record/associations/ has_many_association.rb:13:in `initialize'' from /Applications/Locomotive2/Bundles/ standardRailsMar2007.locobundle/i386/lib/ruby/gems/1.8/gems/ activerecord-1.15.3/lib/active_record/associations/ has_many_association.rb:13:in `new'' from /Applications/Locomotive2/Bundles/ standardRailsMar2007.locobundle/i386/lib/ruby/gems/1.8/gems/ activerecord-1.15.3/lib/active_record/associations/ has_many_association.rb:13:in `build'' from (irb):2 Am I doing something stupid? I would expect this to work. Thanks, Scott --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
Greg Donald
2007-Nov-29 16:59 UTC
Re: collection.build or collection.create gives "ArgumentError: wrong number of arguments (1 for 0)"
On Nov 28, 2007 11:48 PM, Scott <tamosunas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> I have a Project that has_many Tasks. Tasks belongs to a Project. When > I try the following: > > project = Project.newYou need to do project.save before adding any tasks. Otherwise how will ActiveRecord know what project_id to record for a given task? -- Greg Donald http://destiney.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 -~----------~----~----~----~------~----~------~--~---
Bob Showalter
2007-Nov-29 17:39 UTC
Re: collection.build or collection.create gives "ArgumentError: wrong number of arguments (1 for 0)"
On Nov 29, 2007 12:48 AM, Scott <tamosunas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> > I have a Project that has_many Tasks. Tasks belongs to a Project. When > I try the following: > > project = Project.new > project.tasks.build > > I get: > > >> s = Project.new > => #<Project:0x25f9e28 @attributes={"name"=>"", "end_at"=>nil, > "updated_at"=>nil, "published_at"=>nil, "user_id"=>nil, > "created_at"=>nil}, @new_record=true> > >> s.tasks.build > ArgumentError: wrong number of arguments (1 for 0) > from /Applications/Locomotive2/Bundles/ > standardRailsMar2007.locobundle/i386/lib/ruby/gems/1.8/gems/ > activerecord-1.15.3/lib/active_record/associations/ > has_many_association.rb:13:in `initialize''Post your models. Possibly has_many declaration is wrong, or Task is not derived from ActiveRecord::Base? Does Task.new give expected results from the console? --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
Scott
2007-Nov-30 17:57 UTC
Re: collection.build or collection.create gives "ArgumentError: wrong number of arguments (1 for 0)"
class Project < ActiveRecord::Base belongs_to :user has_many :tasks end class Task < ActiveRecord::Base belongs_to :project belongs_to :task_type end On Nov 29, 9:39 am, "Bob Showalter" <showa...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> On Nov 29, 2007 12:48 AM, Scott <tamosu...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: > > > > > > > I have a Project that has_many Tasks. Tasks belongs to a Project. When > > I try the following: > > > project = Project.new > > project.tasks.build > > > I get: > > > >> s = Project.new > > => #<Project:0x25f9e28 @attributes={"name"=>"", "end_at"=>nil, > > "updated_at"=>nil, "published_at"=>nil, "user_id"=>nil, > > "created_at"=>nil}, @new_record=true> > > >> s.tasks.build > > ArgumentError: wrong number of arguments (1 for 0) > > from /Applications/Locomotive2/Bundles/ > > standardRailsMar2007.locobundle/i386/lib/ruby/gems/1.8/gems/ > > activerecord-1.15.3/lib/active_record/associations/ > > has_many_association.rb:13:in `initialize'' > > Post your models. Possibly has_many declaration is wrong, or Task is > not derived from ActiveRecord::Base? Does > > Task.new > > give expected results from the console?--~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
Scott
2007-Nov-30 17:59 UTC
Re: collection.build or collection.create gives "ArgumentError: wrong number of arguments (1 for 0)"
From the rdoc on has_many:
collection.build(attributes = {}) - returns a new object of the
collection type that has been instantiated with attributes and linked
to this object through a foreign key but has not yet been saved.
*Note:* This only works if an associated object already exists, not if
it''s nil!
You shouldn''t have to save it... that''s the whole point.
On Nov 29, 8:59 am, "Greg Donald"
<gdon...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> On Nov 28, 2007 11:48 PM, Scott
<tamosu...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > I have a Project that has_many Tasks. Tasks belongs to a Project. When
> > I try the following:
>
> > project = Project.new
>
> You need to do project.save before adding any tasks. Otherwise how
> will ActiveRecord know what project_id to record for a given task?
>
> --
> Greg Donaldhttp://destiney.com/
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