用Jbuilder构造一个嵌套的JSON请求

Question

Currently my JSON request is returning the below, where each person/ lender has many 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"}
    ]
  }
]

I need to nest in one more thing and am having trouble doing so. For context, each inventory item is referenced via it's id as a foreign key in a borrow record. Each borrow record belongs to a request parent that stores returndate and pickupdate . What I need now, is for each inventory item, to nest an array of all the request records, with information on pickupdate and returndate . In other words, desired output:

[
  {"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":
  ...

I have written the following code:

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

When I refresh the page, I get wrong number of arguments (0 for 2..5)

I feel like the issue is that the Request.select... is returning an Array which isn't what needs to go here... but in the earlier nested function lender.inventories is an Inventory::ActiveRecord_Associations_CollectionProxy though I'm not sure how to correct for this.

NOTE: Someone said the problem could be that unlike with the nesting between inventories and lender , there's not an explicit association between inventory and request , but then again the line json.name Itemlist.find_by_id(inventory.itemlist_id).name worked so I'm not sure this is right. (Also if this is the case, I'm not sure how to bypass this limitation... I currently don't want to create a relationship between the two.)

Thanks!

Answer 1

ARG. Ok so this code is perfectly right. The issue was that I"m using the Gon gem in conjunction with Jbuilder, and Request is a predefined class in Gon.

So just changed code to

@requestrecords.select....

And in the controller:

@requestrecords = Request.all

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