Taking time off from programming is always painful :-).
I have the following Models:
===class Tag < ActiveRecord::Base
has_and_belongs_to_many :problems
end
class Problem < ActiveRecord::Base
belongs_to :user
has_and_belongs_to_many :tags
end
===
And the following migrations:
=== create_table "problems" do |t|
t.column "user_id", :integer
t.column "title", :string
t.column "description", :text
t.column "created_at", :datetime
t.column "updated_at", :datetime
end
create_table "tags" do |t|
t.column "name", :string
t.column "created_at", :datetime
t.column "updated_at", :datetime
end
create_table "problems_tags" do |t|
t.column "problem_id", :integer
t.column "tag_id", :integer
end
===
Now, from the console I do the following:
===problem = Problem.find(1)
problem.tags.create :name => "test this tag"
===
The problem is that a row is added to the Tags table but nothing is
added to the problems_tags table. What am I doing wrong?
I hate being rusty. I can''t seem to find the answer anywhere. I am
sure it is really simple.
Thanks for all your help.
John Kopanas
http://www.kopanas.com
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John Kopanas wrote:> ===> class Tag < ActiveRecord::Base > has_and_belongs_to_many :problems > end > > class Problem < ActiveRecord::Base > belongs_to :user > has_and_belongs_to_many :tags > end > ===> > ===> problem = Problem.find(1) > problem.tags.create :name => "test this tag" > ===> > The problem is that a row is added to the Tags table but nothing is > added to the problems_tags table. What am I doing wrong?The problem is that create() is not a supported method for HABTM associations. Or at least there is some confusion about it. It''s not listed in the API for HABTM, but it''s implemented in a broken way. What you''re seeing is exactly what I saw when I dug into it last week. Meanwhile, you can always do: problem.tags << Tag.create(:name => "test this tag") -- Josh Susser http://blog.hasmanythrough.com -- Posted via http://www.ruby-forum.com/.
Thanks a million... that worked great. Is the way you showed me though: problem.tags << Tag.create(:name => "test this tag" the "best practice" or is there another method that people recommend? On 23-May-06, at 7:35 PM, Josh Susser wrote:> John Kopanas wrote: >> ===>> class Tag < ActiveRecord::Base >> has_and_belongs_to_many :problems >> end >> >> class Problem < ActiveRecord::Base >> belongs_to :user >> has_and_belongs_to_many :tags >> end >> ===>> >> ===>> problem = Problem.find(1) >> problem.tags.create :name => "test this tag" >> ===>> >> The problem is that a row is added to the Tags table but nothing is >> added to the problems_tags table. What am I doing wrong? > > The problem is that create() is not a supported method for HABTM > associations. Or at least there is some confusion about it. It''s not > listed in the API for HABTM, but it''s implemented in a broken way. > What > you''re seeing is exactly what I saw when I dug into it last week. > > Meanwhile, you can always do: > > problem.tags << Tag.create(:name => "test this tag") > > -- > Josh Susser > http://blog.hasmanythrough.com > > -- > Posted via http://www.ruby-forum.com/. > _______________________________________________ > Rails mailing list > Rails@lists.rubyonrails.org > http://lists.rubyonrails.org/mailman/listinfo/railsJohn Kopanas http://www.kopanas.com ===========================================================http://www.soen.info - Index of online software engineering knowledge http://www.cusec.net - Canadian University Software Engineering Conference http://www.soenlive.com - Presentations from CUSEC