Problem with ActiveRecord::AssociationTypeMismatch

rubyonrails-talk
1

Hi all ! I've written a Character model, each character has many Attributes. My schema.rb looks like this:

create_table "characters", :force => true do |t|   t.string "first_name"   t.string "last_name"   t.integer "user_id"   t.datetime "created_at"   t.datetime "updated_at" end

create_table "attributes", :force => true do |t|   t.string "name"   t.float "value"   t.integer "character_id"   t.datetime "created_at"   t.datetime "updated_at" end

And the models look like this: class Character < ActiveRecord::Base   has_many :attributes   ... end

class Attribute < ActiveRecord::Base   belongs_to :character end

When I want to create a new instance by calling c = Character.new :first_name => "hello", :last_name => "world" I get this Error: ActiveRecord::AssociationTypeMismatch: Attribute(#17724630) expected, got Array(#104100)   from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/ associations/association_proxy.rb:214:in `raise_on_type_mismatch'   from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/ associations/association_collection.rb:229:in `replace'   from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/ associations/association_collection.rb:229:in `each'   from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/ associations/association_collection.rb:229:in `replace'   from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/ associations.rb:1149:in `attributes='   from /Library/Ruby/Gems/1.8/gems/activerecord-2.1.0/lib/active_record/ base.rb:2130:in `initialize'   from (irb):1:in `new'   from (irb):1

I have no idea why I get this error, since I don't specify the "attributes" key. I hope you can help me, thank you very much in advance.

Greetings, Christoph

2

Hi all ! I've written a Character model, each character has many Attributes. My schema.rb looks like this:

create_table "characters", :force => true do |t| t.string "first_name" t.string "last_name" t.integer "user_id" t.datetime "created_at" t.datetime "updated_at" end

create_table "attributes", :force => true do |t| t.string "name" t.float "value" t.integer "character_id" t.datetime "created_at" t.datetime "updated_at" end

And the models look like this: class Character < ActiveRecord::Base has_many :attributes

Don't do this. You'll overwrite the existing attributes and attributes= methods. Bad stuff will happen.

Fred

3

Oh my god, I didn't know that "attributes" has a special meaning. Thank you very much,

Christoph