ActiveRecord的地方在孫子的查詢屬性

User has_many Plans 
Plan has_many PlanDates 
PlanDates has an attr :ddate that is a Date 
week = [Array of dates in a given week]

鑑於這種情況，我想知道如何構建該查找所有誰擁有任何具有PlanDate在給定的一週計劃的任何用戶的獨特user_ids查詢。ActiveRecord的地方在孫子的查詢屬性

到目前爲止，我有這樣的：

week_users = User.joins(plans: :plan_dates).where.not(id: 246).where("plans.plan_dates.ddate >= ?", week.first).where("plans.plan_dates.ddate <= ?", week.last).uniq 

=> PG::UndefinedTable: ERROR: invalid reference to FROM-clause entry for table "plan_dates" 
LINE 1: ..." = "plans"."id" WHERE ("users"."id" != 246) AND (plans.plan... 
                 ^
HINT: There is an entry for table "plan_dates", but it cannot be referenced from this part of the query. 
: SELECT DISTINCT "users".* FROM "users" INNER JOIN "plans" ON "plans"."user_id" = "users"."id" INNER JOIN "plan_dates" ON "plan_dates"."plan_id" = "plans"."id" WHERE ("users"."id" != 246) AND (plans.plan_dates.ddate >= '2015-11-02') AND (plans.plan_dates.ddate <= '2015-11-06')

的思考？

來源

2015-11-01 james

嘗試'week_users = User.joins（計劃：plan_dates）.where.not（ID ：246）.where（「plan_dates.ddate> =？」，week.first）.where（「plan_dates.ddate <=？」，week.last）.uniq' – Pavan

that worked thanks！我沒有意識到你不需要在那裏的協會。如果你發佈答案我會接受 – james

PG::UndefinedTable: ERROR: invalid reference to FROM-clause entry for table "plan_dates"

下面應該工作

week_users = User.joins(plans: :plan_dates).where.not(id: 246).where("plan_dates.ddate >= ?", week.first).where("plan_dates.ddate <= ?", week.last).uniq

您還可以將其簡化爲以下

week_users = User.joins(plans: :plan_dates).where.not(id: 246).where(plan_dates: { ddate: week.first..week.last }).uniq

來源

2015-11-01 17:33:01 Pavan

ActiveRecord的地方在孫子的查詢屬性

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