Hey there, Im fairly new to rails and i''ve tried several tutorials which taught me how to use the associatives on a basic level(has_many => belongs_to). However i''m trying to figure out how i can create and execute some kind of a join. My case is: I''ve got a list of playing cards in my DB that are static. Every user can have any of those cards, even multiple times. So my tables would look something like this: users id = 1 name => "Bear Grylls" id => 2 name => "Poopypants" ---------------------- cards id => 1 name => "Captain Carl" id => 2 name => "Whatever" ---------------------- usercardsjoin card_id => 1 user_id => 1 card_id => 2 user_id=> 1 card_id => 1 user_id => 2 ---------------------- Although i know how it should look like because of my experience with PHP i have absolutely no clue how i can get this one to work. Can any of you explain this or send me a link which handles this particular issue? Thanks in advance, -- 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.
Check out the guide to associations. It should have more information than you need... http://guides.rubyonrails.org/association_basics.html -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To view this discussion on the web visit https://groups.google.com/d/msg/rubyonrails-talk/-/UlQcD6K5UpUJ. 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.
Hey! Associats are covered in great detail here: http://guides.rubyonrails.org/association_basics.html I think what you need is a has_many :through association -- Manuel -- 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.
Thanks you guys, i''ve actually tried that(And failed) Perhaps you guys
can help me out.
I have to following files:
card_controller.rb
class CardController < ApplicationController
has_many :cardlevels
has_many :users, :through => :cardlevels
def show
@cards = Card.find(1)
end
end
------------------------------------------------------
cardlevel_controller.rb
class CardlevelController < ApplicationController
belongs_to :users
belongs_to :cards
end
------------------------------------------------------
user_controller.rb
class UserController < ApplicationController
has_many :cardlevels
has_many :cards, :through => :cardlevels
end
------------------------------------------------------
As you can see i''m doing @cards = Card.find(1) in the card_controller.
However i''m getting the error: "undefined method
`has_many'' for
CardController:Class"
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I seem to have it up and running at this point. I made all the
has_many''s etc. in my models. But when i try @cards.user (Or each it
first and use c.user) it says ''undefined method
''user''''. So i''m assuming
i''m doing something awfully wrong.
My card_controller looks like this
def show
@cards = Card.all
end
Here are my models:
card.rb
class Card < ActiveRecord::Base
has_many :cardlevels
has_many :users, :through => :cardlevels
end
-------------------------------------------------
cardlevel.rb
class Cardlevel < ActiveRecord::Base
belongs_to :users
belongs_to :cards
end
-------------------------------------------------
user.rb
class User < ActiveRecord::Base
has_many :cardlevels
has_many :cards, :through => :cardlevels
end
-------------------------------------------------
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On 19 June 2012 13:38, Timen E. <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> I seem to have it up and running at this point. I made all the > has_many''s etc. in my models. But when i try @cards.user (Or each it > first and use c.user) it says ''undefined method ''user''''. So i''m assuming > i''m doing something awfully wrong. > > My card_controller looks like this > def show > @cards = Card.all > end > > > > Here are my models: > card.rb > class Card < ActiveRecord::Base > has_many :cardlevels > has_many :users, :through => :cardlevels > end > ------------------------------------------------- > > cardlevel.rb > class Cardlevel < ActiveRecord::Base > belongs_to :users > belongs_to :cardsThose should both be singular (:user and :card). Each cardlevel belongs to one user and card so they should be singular. Colin> end > ------------------------------------------------- > > user.rb > class User < ActiveRecord::Base > has_many :cardlevels > has_many :cards, :through => :cardlevels > end > > ------------------------------------------------- > > -- > 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@googlegroups.com. > For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en. >-- 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.
Colin Law wrote in post #1065209:> On 19 June 2012 13:38, Timen E. <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote: >> >> class Cardlevel < ActiveRecord::Base >> belongs_to :users >> belongs_to :cards > > Those should both be singular (:user and :card). Each cardlevel > belongs to one user and card so they should be singular. > > ColinThat sounds fair indeed, however when i tried i still got the same error. This associations got me so bloody confused :'') -- 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 20 June 2012 08:39, Timen E. <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> Colin Law wrote in post #1065209: >> On 19 June 2012 13:38, Timen E. <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote: >>> >>> class Cardlevel < ActiveRecord::Base >>> belongs_to :users >>> belongs_to :cards >> >> Those should both be singular (:user and :card). Each cardlevel >> belongs to one user and card so they should be singular. >> >> Colin > > That sounds fair indeed, however when i tried i still got the same > error. This associations got me so bloody confused :'')Post the code for the models, the code that generates the error (with a few lines each side) and the full error message. 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.
I''ve just got a really basic setup to see if i got it working:
card.rb
class Card < ActiveRecord::Base
attr_accessible :attack, :defense, :name
has_many :cardlevels
has_many :users, :through => :cardlevels
end
cardlevel.rb
class Cardlevel < ActiveRecord::Base
attr_accessible :card_id, :level, :user_id
belongs_to :user
belongs_to :card
end
user.rb
class User < ActiveRecord::Base
attr_accessible :name
has_many :cardlevels
has_many :cards
end
-----------------------------------------------------
card_controller.rb
class CardController < ApplicationController
def show
@card = Card.all
end
end
User & cardlevel are empty for now
-----------------------------------------------------
<h1>Card#show</h1>
<p>Find me in app/views/card/show.html.erb</p>
<%= @card.user %>
Where i tried eaching the @card, tried @card.users, @card.user.name etc.
etc.
-----------------------------------------------------
The error:
Showing c:/tuts/kaartje/app/views/card/show.html.erb where line #3
raised:
undefined method `user'' for #<Array:0x3c81ac8>
Extracted source (around line #3):
1: <h1>Card#show</h1>
2: <p>Find me in app/views/card/show.html.erb</p>
3: <%= @card.user %>
Rails.root: c:/tuts/kaartje
Application Trace | Framework Trace | Full Trace
app/views/card/show.html.erb:3:in
`_app_views_card_show_html_erb___1042037435_30519240''
Request
Parameters:
{"id"=>"show"}
-----------------------------------------------------
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On 20 June 2012 08:51, Timen E. <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> #card_controller.rb > class CardController < ApplicationController > def show > @card = Card.all > end > end > > <h1>Card#show</h1> > <p>Find me in app/views/card/show.html.erb</p> > <%= @card.user %> > > undefined method `user'' for #<Array:0x3c81ac8> > Extracted source (around line #3):@card is a collection of cards (that''s how you populate it in the "show" action. If it needs to be a single card, you need to find it by ID (or some other attribute), if it''s supposed to be a collection of every card, you need to iterate it in the view and print the user for each card. -- 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.
On 20 June 2012 08:51, Timen E. <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> I''ve just got a really basic setup to see if i got it working: > > > card.rb > class Card < ActiveRecord::Base > attr_accessible :attack, :defense, :name > has_many :cardlevels > has_many :users, :through => :cardlevels > end > > cardlevel.rb > class Cardlevel < ActiveRecord::Base > attr_accessible :card_id, :level, :user_id > belongs_to :user > belongs_to :card > end > > user.rb > class User < ActiveRecord::Base > attr_accessible :name > has_many :cardlevels > has_many :cards > end > ----------------------------------------------------- > > card_controller.rb > class CardController < ApplicationController > def show > @card = Card.allYou would have been better to put @cards = Card.all as the result will be be an (effectively) an array of cards not a single one.> end > end > > User & cardlevel are empty for now > ----------------------------------------------------- > > <h1>Card#show</h1> > <p>Find me in app/views/card/show.html.erb</p> > <%= @card.user %> > Where i tried eaching the @card, tried @card.users, @card.user.name etc. > etc. > ----------------------------------------------------- > > The error: > Showing c:/tuts/kaartje/app/views/card/show.html.erb where line #3 > raised: > > undefined method `user'' for #<Array:0x3c81ac8>The clue is in the error message, as is often the case, it says that @card is an Array and the Arrray class does not have a method user. You can only call user on an individual card. Colin> Extracted source (around line #3): > > 1: <h1>Card#show</h1> > 2: <p>Find me in app/views/card/show.html.erb</p> > 3: <%= @card.user %> > Rails.root: c:/tuts/kaartje > > Application Trace | Framework Trace | Full Trace > app/views/card/show.html.erb:3:in > `_app_views_card_show_html_erb___1042037435_30519240'' > Request > > Parameters: > > {"id"=>"show"} > ----------------------------------------------------- > > -- > 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@googlegroups.com. > For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en. >-- 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.
Michael Pavling wrote in post #1065301:> On 20 June 2012 08:51, Timen E. <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote: >> >> undefined method `user'' for #<Array:0x3c81ac8> >> Extracted source (around line #3): > > @card is a collection of cards (that''s how you populate it in the > "show" action. If it needs to be a single card, you need to find it by > ID (or some other attribute), if it''s supposed to be a collection of > every card, you need to iterate it in the view and print the user for > each card.aaah i see, nonetheless i noticed that i turned it around. I need to get the user with it''s cards, haha! What you mentioned did work but it doesn''t seem to ''associate'' the right way around because i''m getting the error SQLite3::SQLException: no such column: cards.user_id: SELECT "cards".* FROM "cards" WHERE "cards"."user_id" = 1"". Shouldn''t he query through cardlevels instead of cards? -- 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.
Still got one(Hopefuly last for now) question, guys. I''ve got the above data now and i can access my cards through users that are joined by the cardlevel. I''m trying to loop through all the cards a user has as such: <% @user.cards.each do |c| %> <%= c.name %><br> <% end %> And this works great. However i''d like to get some extra info about this card from my cardlevel array, but i can''t seem to access it like this. I can however loop it in a seperate each, but i don''t want that obviously. Any ideas? Thanks -- 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 20 June 2012 09:32, Timen E. <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> Still got one(Hopefuly last for now) question, guys. > > I''ve got the above data now and i can access my cards through users that > are joined by the cardlevel. I''m trying to loop through all the cards a > user has as such: > <% @user.cards.each do |c| %> > <%= c.name %><br> > <% end %> > > And this works great. However i''d like to get some extra info about this > card from my cardlevel array, but i can''t seem to access it like this. I > can however loop it in a seperate each, but i don''t want that obviously.You have not explained well what you are trying to do, but possibly you want to loop through the cardlevels instead of the cards, then for each cardlevel you can obtain the card aswell as the other data, so something like <% @user.cardlevels.each do |cl| %> <%= cl.card.name %><br> <%= cl.other_data %> <% end %> You might need to check for cl.card nil though. 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.
Colin Law wrote in post #1065311:> On 20 June 2012 09:32, Timen E. <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote: >> card from my cardlevel array, but i can''t seem to access it like this. I >> can however loop it in a seperate each, but i don''t want that obviously. > > You have not explained well what you are trying to do, but possibly > you want to loop through the cardlevels instead of the cards, then for > each cardlevel you can obtain the card aswell as the other data, so > something like > > <% @user.cardlevels.each do |cl| %> > <%= cl.card.name %><br> > <%= cl.other_data %> > <% end %> > > You might need to check for cl.card nil though. > > ColinYou''re my savior, thanks alot! It''s more the train of thought that needs correcting than my code i guess. -- 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.