我有
class CreateRoles < ActiveRecord::Migration
def change
create_table :roles do |t|
t.string :name
t.timestamps
end
end
end
和
class Role < ActiveRecord::Base
attr_accessible :name
has_many :members, :posts
end
class Post < ActiveRecord::Base
attr_accessible :content, :title, :role_id
belongs_to :role
end
class Member < ActiveRecord::Base
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable, :lockable
attr_accessible :role_id, :first_name, :last_name, :email, :password, :password_confirmation, :remember_me
end
在 Rails 控制台或 seeds.rb 中,我输入
Role.create(name: 'guest')
并得到错误
TypeError: can't convert Symbol into Integer
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.8/lib/active_record/associations/builder/collection_association.rb:35:in `[]'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.8/lib/active_record/associations/builder/collection_association.rb:35:in `wrap_block_extension'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.8/lib/active_record/associations/builder/collection_association.rb:22:in `build'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.8/lib/active_record/autosave_association.rb:139:in `build'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.8/lib/active_record/associations/builder/has_many.rb:10:in `build'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.8/lib/active_record/associations/builder/collection_association.rb:13:in `build'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.8/lib/active_record/associations.rb:1195:in `has_many'
from /Users/ataylo9/Dropbox/Developer/hamsterdam/app/models/role.rb:3:in `<class:Role>'
from /Users/ataylo9/Dropbox/Developer/hamsterdam/app/models/role.rb:1:in `<top (required)>'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:469:in `load'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:469:in `block in load_file'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:639:in `new_constants_in'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:468:in `load_file'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:353:in `require_or_load'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:502:in `load_missing_constant'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:192:in `block in const_missing'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:190:in `each'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:190:in `const_missing'
from (irb):1
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/commands/console.rb:47:in `start'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/commands/console.rb:8:in `start'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/commands.rb:41:in `<top (required)>'
from script/rails:6:in `require'
我知道我收到错误是因为 Rails 想要建立成员和帖子的关系,但它不应该只是让这些为零。我什至尝试在 seeds.rb 中显式地将数组设置为 nil,但得到了相同的错误。
我不明白什么?谢谢!
更新:添加了帖子和成员(member)模型以供引用
最佳答案
我使用相同的模型创建了相同的项目。而我发现这种描述关系就出现了那个错误。
class Role < ActiveRecord::Base
attr_accessible :name
has_many :members, :posts
end
我尝试过这个:
class Role < ActiveRecord::Base
attr_accessible :name
has_many :members
has_many :posts
end
class Post < ActiveRecord::Base
attr_accessible :name, :role_id
belongs_to :role
end
class Member < ActiveRecord::Base
attr_accessible :name, :role_id
belongs_to :role
end
一切正常。我不知道为什么,但看起来 has_many :posts, :members 出现了问题。但你可以用不同的方式编写来解决这个问题。
关于ruby-on-rails-3 - ActiveRecord::Base#create - 类型错误:无法将符号转换为整数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14245919/