无法使用where子句rails检索信息

Question

所以我有三张表：

1. 用户
2. 客户
3. 预约

Customer has_many Appointments，Customer belongs_to User

我必须根据Appointments的{​​{1}}检索email。我在customer表格中有email字段。

我尝试了以下查询：

User

给了我这个错误：

Appointment.joins(:customer).where("customers.users.email ILIKE test")

我尝试添加这个：

 Appointment Load (1.3ms)  SELECT "appointments".* FROM "appointments" INNER JOIN "customers" ON "customers"."id" = "appointments"."customer_id" WHERE (customers.users.email ILIKE test)
PG::UndefinedTable: ERROR:  missing FROM-clause entry for table "users"
LINE 1: ...omers"."id" = "appointments"."customer_id" WHERE (customers....
                                                             ^
: SELECT "appointments".* FROM "appointments" INNER JOIN "customers" ON "customers"."id" = "appointments"."customer_id" WHERE (customers.users.email ILIKE test)

以及

 belongs_to :customer, inverse_of: :appointments
 belongs_to :user, through: :customer

显然这些都不起作用。我也在客户模型中试过这个：

has_one :customer_user, through: :customer

和查询：

delegate :email, to: :user, prefix: true

引发以下错误：

User.joins(:customer).where("customers.user_email ILIKE test")

如何与具有特定电子邮件ID的客户一起获取约会。

Answer 1

要在users表格上进行过滤，您需要将其包含在join中。尝试：

Appointment.joins([customer: :user]).where("users.email ILIKE test")

这将在appointments和customers以及customers和users之间创建一个联接，允许您过滤users表格列。