Ruby on rails Rails 5连接两个表上的where子句

如何在

Reply

表中包含where子句和以下查询

Reply.joins(:replier_account).where(replier_accounts: {account_type: 'reply' })

我试着在结尾添加它，如下所示：

Reply.joins(:replier_account).where(replier_accounts: {account_type: 'reply' }).where("created_at > ?", 7.days.ago)

但我收到了以下错误：

ActiveRecord::StatementInvalid: PG::AmbiguousColumn: ERROR:  column reference "created_at" is ambiguous

---

错误告诉您，它不知道要在哪个表上筛选“created_at”（据猜测，它们都已“created_at”）。尝试将表名附加到创建的位置；像这样：

Reply.joins(:replier_account)
     .where(replier_accounts: {account_type: 'reply' })
     .where("replier_accounts.created_at > ?", 7.days.ago)

---

错误告诉您，它不知道要在哪个表上筛选“created_at”（据猜测，它们都已“created_at”）。尝试将表名附加到创建的位置；像这样：

Reply.joins(:replier_account)
     .where(replier_accounts: {account_type: 'reply' })
     .where("replier_accounts.created_at > ?", 7.days.ago)

---

重写此查询的另一种方法是将WHERE条件合并到一个调用中

要获取其帐户在过去7天内创建的答复，请执行以下操作：

Reply.joins(:replier_account)
     .where(
        "replier_accounts.account_type = :type AND replier_accounts.created_at > :created_at",
        { type: 'reply', created_at: 7.days.ago }
     )

Reply.joins(:replier_account)
     .where(
        "replier_accounts.account_type = :type AND replies.created_at > :created_at",
        { type: 'reply', created_at: 7.days.ago }
     )

或者，获取在过去7天内创建的答复：

Reply.joins(:replier_account)
     .where(
        "replier_accounts.account_type = :type AND replier_accounts.created_at > :created_at",
        { type: 'reply', created_at: 7.days.ago }
     )

Reply.joins(:replier_account)
     .where(
        "replier_accounts.account_type = :type AND replies.created_at > :created_at",
        { type: 'reply', created_at: 7.days.ago }
     )

---

重写此查询的另一种方法是将WHERE条件合并到一个调用中

要获取其帐户在过去7天内创建的答复，请执行以下操作：

Reply.joins(:replier_account)
     .where(
        "replier_accounts.account_type = :type AND replier_accounts.created_at > :created_at",
        { type: 'reply', created_at: 7.days.ago }
     )

Reply.joins(:replier_account)
     .where(
        "replier_accounts.account_type = :type AND replies.created_at > :created_at",
        { type: 'reply', created_at: 7.days.ago }
     )

或者，获取在过去7天内创建的答复：

Reply.joins(:replier_account)
     .where(
        "replier_accounts.account_type = :type AND replier_accounts.created_at > :created_at",
        { type: 'reply', created_at: 7.days.ago }
     )

Reply.joins(:replier_account)
     .where(
        "replier_accounts.account_type = :type AND replies.created_at > :created_at",
        { type: 'reply', created_at: 7.days.ago }
     )