Question

目前我的JSON请求返回以下内容，其中每个人/ lender都有很多inventories。

#output of /test.json

[
  {"id":13, "email":"johndoe@example.com", "inventories":
    [
      {"id":10,"name":"2-Person Tent","category":"Camping"},
      {"id":11,"name":"Sleeping bag","category":"Camping"},
      {"id":27,"name":"6-Person Tent","category":"Camping"}
    ]
  },

  {"id":14, "email":"janedoe@example.com", "inventories":
    [
      {"id":30,"name":"Electric drill","category":"Tools"},
      {"id":1,"name":"Hammer","category":"Tools"},
      {"id":37,"name":"Plane","category":"Tools"}
    ]
  }
]

我需要再嵌套一件事，而且我很难这样做。对于上下文，每个inventory项通过它的id作为borrow记录中的外键引用。每个borrow记录属于request父级，用于存储returndate和pickupdate。我现在需要的是，为每个inventory项目嵌套所有request条记录的数组，并提供有关pickupdate和returndate的信息。换句话说，期望的输出：

[
  {"id":13, "email":"johndoe@example.com", "inventories":
    [
      {"id":10,"name":"2-Person Tent","category":"Camping", "requests": 
        [
          {"id":1, "pickupdate":"2014-07-07","returndate":"2014-07-10"},
          {"id":2, "pickupdate":"2014-06-02","returndate":"2014-06-05"},
          {"id":3, "pickupdate":"2014-08-14","returndate":"2014-08-20"}
        ]
      },
      {"id":11,"name":"Sleeping bag","category":"Camping", "requests":
        [
          {"id":4, "pickupdate":"2014-05-27","returndate":"2014-05-30"},
          {"id":5, "pickupdate":"2014-04-22","returndate":"2014-04-25"}
        ]
      },
      {"id":27,"name":"6-Person Tent","category":"Camping", "requests":
        [
          {"id":6, "pickupdate":"2014-07-10","returndate":"2014-07-12"}
        ]
      }
    ]
  },

  {"id":14, "email":"janedoe@example.com", "inventories":
  ...

我写了以下代码：

json.array!(@lenders) do |json, lender|
  json.(lender, :id, :email)
  json.inventories lender.inventories do |json, inventory|
    json.id inventory.id
    json.name Itemlist.find_by_id(inventory.itemlist_id).name

    #code below says, json.requests should equal all the Requests where there is a Borrows within that Request that is using the Inventory in question
    json.requests Request.select { |r| r.borrows.select { |b| b.inventory_id == inventory.id }.present? } do |json, request|
      json.pickupdate request.pickupdate
      json.returndate request.returndate
    end
  end
end

当我刷新页面时，我得到wrong number of arguments (0 for 2..5)

我觉得问题是Request.select...正在返回一个不需要去的数组...但是在早期的嵌套函数lender.inventories中是Inventory::ActiveRecord_Associations_CollectionProxy虽然我不确定如何纠正这个问题。

注意：有人说问题可能与inventories和lender之间的嵌套不同，inventory和request之间没有显式关联，但是json.name Itemlist.find_by_id(inventory.itemlist_id).name行有效，所以我不确定这是对的。（如果是这种情况，我不确定如何绕过这个限制......我现在不想在两者之间建立关系。）

谢谢！

Answer 1

ARG。好的，所以这段代码是完全正确的。问题在于我将Gon gem与Jbuilder结合使用，而Request是Gon中的预定义类。

所以只需将代码更改为

@requestrecords.select....

在控制器中：

@requestrecords = Request.all

-__-

使用Jbuilder构造嵌套的JSON请求

1 个答案: