Rails find_by - 关联比较

Question

我有三个模型：

class User < ActiveRecord::Base
    has_many :surveys
end
class Survey < ActiveRecord::Base
    belongs_to :user
    has_many :survey_sessions
end
class SurveySession < ActiveRecord::Base
  belongs_to :survey
end

我的问题：

如果可能的话：

Survey.find_by!(id: params[:id], user: current_user)

为什么这会向我抛出 SQLException？

SurveySession.joins(:survey)
    .find_by!(id: params[:id], surveys: {user: current_user})


SQLite3::SQLException: no such column: surveys.user: 
SELECT "survey_sessions".* FROM "survey_sessions" INNER JOIN "surveys" ON "surveys"."id" = "survey_sessions"."survey_id" WHERE "survey_sessions"."id" = 3 AND "surveys"."user" = 1 LIMIT 1

提前致谢！ :)

Answer 1

SurveySession.joins(:survey).find_by!(id: params[:id], surveys: {user_id: current_user})

Rails find_by - 关联比较

Rails find_by - Association comparison

activerecord

ruby-on-rails

associations