ruby-on-rails - NoMethodError:＃<教育ID:无，profile_id:无，school_name:无>的未定义方法`each'

试图在个人资料和教育之间建立一对多的关系我在尝试将教育添加到配置文件时遇到此错误。

.-(~/scratch/rails_projects/rezumei)-----------------------------------------------------------------------------------------------------------(patrick@tesla)-
`--> rails c
Loading development environment (Rails 4.0.2)
irb(main):001:0> patrick = User.new
=> #<User id: nil, email: "", encrypted_password: "", reset_password_token: nil, reset_password_sent_at: nil, remember_created_at: nil, sign_in_count: 0, current_sign_in_at: nil, last_sign_in_at: nil, current_sign_in_ip: nil, last_sign_in_ip: nil, created_at: nil, updated_at: nil, profile_id: nil>
irb(main):002:0> patrick.profile = Profile.new
=> #<Profile id: nil, first_name: nil, last_name: nil, interests: nil, headline: nil, created_at: nil, updated_at: nil, user_id: nil, profile_id: nil, maiden_name: nil, industry: nil, summary: nil, specialties: nil, picture_url: nil, email_address: nil, skills: nil, phone_numbers: nil, main_address: nil>
irb(main):003:0> patrick.profile.educations = Education.new
NoMethodError: undefined method `each' for #<Education id: nil, profile_id: nil, school_name: nil>
    from /home/patrick/scratch/rails_projects/rezumei/vendor/bundle/ruby/2.0.0/gems/activemodel-4.0.2/lib/active_model/attribute_methods.rb:439:in `method_missing'
    from /home/patrick/scratch/rails_projects/rezumei/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.2/lib/active_record/attribute_methods.rb:152:in `method_missing'
    from /home/patrick/scratch/rails_projects/rezumei/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.2/lib/active_record/associations/collection_association.rb:333:in `replace'
    from /home/patrick/scratch/rails_projects/rezumei/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.2/lib/active_record/associations/collection_association.rb:42:in `writer'
    from /home/patrick/scratch/rails_projects/rezumei/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.2/lib/active_record/associations/builder/association.rb:78:in `educations='
    from (irb):3
    from /home/patrick/scratch/rails_projects/rezumei/vendor/bundle/ruby/2.0.0/gems/railties-4.0.2/lib/rails/commands/console.rb:90:in `start'
    from /home/patrick/scratch/rails_projects/rezumei/vendor/bundle/ruby/2.0.0/gems/railties-4.0.2/lib/rails/commands/console.rb:9:in `start'
    from /home/patrick/scratch/rails_projects/rezumei/vendor/bundle/ruby/2.0.0/gems/railties-4.0.2/lib/rails/commands.rb:62:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'
irb(main):004:0>

class User < ActiveRecord::Base
    has_one :profile, dependent: :destroy
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
end

class Profile < ActiveRecord::Base
    belongs_to :user
    has_many :educations, dependent: :destroy
end

class Education < ActiveRecord::Base
    belongs_to :profile
end

最佳答案

这可用于将Education添加到educations中：

patrick.profile.educations << Education.new

关于ruby-on-rails - NoMethodError:＃<教育ID:无，profile_id:无，school_name:无>的未定义方法`each'，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/21333447/