传递给#or 的关系必须在结构上兼容.不兼容的值:[:references] [英] Relation passed to #or must be structurally compatible. Incompatible values: [:references]

问题描述

我有两个查询，我需要在它们之间使用 或，即我想要第一个或第二个查询返回的结果.

I have two queries, I need an or between them, i.e. I want results that are returned by either the first or the second query.

第一个查询是一个简单的where()，它获取所有可用的项目.

First query is a simple where() which gets all available items.

@items = @items.where(available: true)

Second 包含一个 join() 并提供当前用户的项目.

Second includes a join() and gives the current user's items.

@items =
  @items
  .joins(:orders)
  .where(orders: { user_id: current_user.id})

我尝试将这些与 Rails 的 or() 方法以各种形式结合起来，包括:

I tried to combine these with Rails' or() method in various forms, including:

@items =
  @items
  .joins(:orders)
  .where(orders: { user_id: current_user.id})
  .or(
    @items
    .joins(:orders)
    .where(available: true)
  )

但我一直遇到这个错误，我不知道如何解决它.

But I keep running into this error and I'm not sure how to fix it.

Relation passed to #or must be structurally compatible. Incompatible values: [:references]

推荐答案

有一个已知问题它在 Github 上.

根据此评论，您可能想要覆盖在结构上不兼容_a> 克服这个问题:

According to this comment you might want to override the structurally_incompatible_values_for_or to overcome the issue:

def structurally_incompatible_values_for_or(other)
  Relation::SINGLE_VALUE_METHODS.reject { |m| send("#{m}_value") == other.send("#{m}_value") } +
    (Relation::MULTI_VALUE_METHODS - [:eager_load, :references, :extending]).reject { |m| send("#{m}_values") == other.send("#{m}_values") } +
    (Relation::CLAUSE_METHODS - [:having, :where]).reject { |m| send("#{m}_clause") == other.send("#{m}_clause") }
end

也总是有使用 SQL 的选项:

Also there is always an option to use SQL:

@items
  .joins(:orders)
  .where("orders.user_id = ? OR items.available = true", current_user.id)

这篇关于传递给#or 的关系必须在结构上兼容.不兼容的值:[:references]的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！