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나는 두 테이블 emp
및 requisition
두 테이블의 데이터를 레일로 가져 옵니까?
emp.rb
class Emp < ActiveRecord::Base
has_many :requisitions
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable,:confirmable,:lockable
attr_accessor :email
attr_accessible :password,:password_confirmation,:remember_me, :email , :username
string_regex = /\A[a-z]+\z/i
validates :username,
:format => { :with => string_regex ,:message=> "must be string"},
:uniqueness => {
:case_sensitive => false
}
end
Requisition
class Requisition < ActiveRecord::Base
belongs_to :emp
attr_accessible :name , :unit , :quantity ,:from ,:particular ,:total , :cost
validates :name , :unit , :quantity ,:from ,:particular ,:total , :cost , presence: true
validates :particular, :presence => true,
:length => { :within => 6..60 }
validates :quantity, numericality: { only_integer: true },
:length => {:maximum => 4}
validates :quantity, numericality: { only_integer: true },
:length => {:maximum => 4}
end
내가 할 일은해야하는지 편집 EMP의 요청의 수를 계산하려면이? 당신이 당신의 Requisition
모델
belongs_to :emp
이 있어야합니다 그래서 내 로그에서
는
irb(main):002:0> @emp.requisitions.count
(1.0ms) SELECT COUNT(*) FROM "requisitions" WHERE "requisitions"."emp_id" =$1 [[nil, 2]]
PG::UndefinedColumn: ERROR: column requisitions.emp_id does not exist
LINE 1: SELECT COUNT(*) FROM "requisitions" WHERE "requisitions"."e...: SELECT COUNT(*) FROM "requisitions" WHERE "requisitions"."emp_id" = $1
ActiveRecord::StatementInvalid: PG::UndefinedColumn: ERROR: column requisitions.emp_id does not exist
LINE 1: SELECT COUNT(*) FROM "requisitions" WHERE "requisitions"."e...
^
: SELECT COUNT(*) FROM "requisitions" WHERE "requisitions"."emp_id" = $1from F:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activerecord-4.0.0/lib/active_record/connection_adapters/postgresql_adapter.rb:811:in `prepare
로그를 추가했습니다 .. –
@SNEHPANDYA 마이그레이션을 잊어 버렸습니다. 나는 내 대답을 넓혔다. –
완벽한 답변 .. –