Hi all, still new at this lol, trying to create a one to many relationship i have: group.rb [ belongs_to :user ] user.rb [ has_many :groups ] but if i do "user.groups" it just throws up: "NoMethodError: undefined method ''groups''.." again thanks for any help! Al -- 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-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
On 22 September 2010 21:33, Al Rowan <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> Hi all, > > still new at this lol, trying to create a one to many relationship > > i have: > > group.rb [ > > belongs_to :user > ] > > user.rb [ > > has_many :groups > > ]Could you show us the code for the models (leave out any methods you have added, just the class definition and bits you put at the beginning of the class.> > but if i do "user.groups" it just throws up: > "NoMethodError: undefined method ''groups''.."Do the users and groups tables exist in the database? If so what fields do they contain? Show us the code around the failure and the stack trace please. Colin -- 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-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
class User < ActiveRecord::Base
attr_accessor :password
validates :email, :uniqueness => true,
:length => { :within => 5..50 },
:format => { :with =>
/^[^@][\w.-]+@[\w.-]+[.][a-z]{2,4}$/i }
validates :password, :confirmation => true,
:length => { :within => 4..20 },
:presence => true,
:if => :password_required?
has_and_belongs_to_many :subjects
has_one :profile
has_many :classes, :dependent => :nullify
has_many :courses, :dependent => :nullify
has_many :works
has_many :units
has_many :groups
before_save :encrypt_new_password
.....
end
---------------------------------------------------
class Group < ActiveRecord::Base
validates :groupname, :presence => true
belongs_to :user
has_many :students
end
---------------------------------------------------
user = User.new
=> #<User id: nil, email: nil, hashed_password: nil, subject_id: nil,
created_at: nil, updated_at: nil>
---------------------------------------------------
>> group = Group.new
=> #<Group id: nil, groupname: nil, user_id: nil, course_id: nil,
created_at: nil, updated_at: nil>
---------------------------------------------------
WHAT THE HELL. i just did user.groups and it worked...i didnt change
anything! now im even more confused.
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activesupport (3.0.0) lib/active_support/whiny_nil.rb:48:in `method_missing'' app/controllers/groups_controller.rb:8:in `create'' actionpack (3.0.0) lib/action_controller/metal/implicit_render.rb:4:in `send_action'' actionpack (3.0.0) lib/action_controller/metal/implicit_render.rb:4:in `send_action'' actionpack (3.0.0) lib/abstract_controller/base.rb:150:in `process_action'' actionpack (3.0.0) lib/action_controller/metal/rendering.rb:11:in `process_action'' actionpack (3.0.0) lib/abstract_controller/callbacks.rb:18:in `process_action'' activesupport (3.0.0) lib/active_support/callbacks.rb:435:in `_run__1879433143__process_action__1623385099__callbacks'' activesupport (3.0.0) lib/active_support/callbacks.rb:409:in `send'' activesupport (3.0.0) lib/active_support/callbacks.rb:409:in `_run_process_action_callbacks'' activesupport (3.0.0) lib/active_support/callbacks.rb:93:in `send'' activesupport (3.0.0) lib/active_support/callbacks.rb:93:in `run_callbacks'' actionpack (3.0.0) 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/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:162:in `start'' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:95:in `start'' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:92:in `each'' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:92:in `start'' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:23:in `start'' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/webrick/server.rb:82:in `start'' rack (1.2.1) lib/rack/handler/webrick.rb:13:in `run'' rack (1.2.1) lib/rack/server.rb:213:in `start'' railties (3.0.0) lib/rails/commands/server.rb:65:in `start'' railties (3.0.0) lib/rails/commands.rb:30 railties (3.0.0) lib/rails/commands.rb:27:in `tap'' railties (3.0.0) lib/rails/commands.rb:27 script/rails:6:in `require'' script/rails:6 -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. 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On 22 September 2010 21:54, Al Rowan <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> class User < ActiveRecord::Base > attr_accessor :password > > validates :email, :uniqueness => true, > :length => { :within => 5..50 }, > :format => { :with => > /^[^@][\w.-]+@[\w.-]+[.][a-z]{2,4}$/i } > validates :password, :confirmation => true, > :length => { :within => 4..20 }, > :presence => true, > :if => :password_required? > > has_and_belongs_to_many :subjects > has_one :profile > has_many :classes, :dependent => :nullify > has_many :courses, :dependent => :nullify > has_many :works > has_many :units > has_many :groups > before_save :encrypt_new_password > ..... > end > > --------------------------------------------------- > > class Group < ActiveRecord::Base > > validates :groupname, :presence => true > > belongs_to :user > has_many :students > end > > --------------------------------------------------- > > user = User.new > => #<User id: nil, email: nil, hashed_password: nil, subject_id: nil, > created_at: nil, updated_at: nil> > > --------------------------------------------------- > >>> group = Group.new > => #<Group id: nil, groupname: nil, user_id: nil, course_id: nil, > created_at: nil, updated_at: nil> > > --------------------------------------------------- > > > WHAT THE HELL. i just did user.groups and it worked...i didnt change > anything! now im even more confused. > --Were you running it from the console when it failed, or from code? If from the console I wonder whether the group model was not loaded or something along those lines. Perhaps by doing Group.new you loaded it so all is well. I suggest pressing on with some code (preceded by writing tests of course) and see how it goes. Colin -- 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-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Marnen Laibow-Koser
2010-Sep-23 14:37 UTC
E-mail validation -- was: Re: has_many - undefined method!
Al Rowan wrote:> class User < ActiveRecord::Base > attr_accessor :password > > validates :email, :uniqueness => true, > :length => { :within => 5..50 }, > :format => { :with => > /^[^@][\w.-]+@[\w.-]+[.][a-z]{2,4}$/i }[...] Separate issue, but a pet peeve of mine: your e-mail validation regexp is *incorrect*. It will reject lots of valid e-mail addresses (including anything with pluscoding). Valid e-mail addresses can take far more forms than most people realize, so that the only correct e-mail validation regexps I''m aware of are about a page in length. With that in mind, then, I recommend not doing this kind of format checking on e-mail addresses. If you must use a regexp, just use something like /@.+\./ , or simply forget the regexp and e-mail an activation code to the address as a means of verifying it. Best, -- Marnen Laibow-Koser http://www.marnen.org marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org -- 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-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.