Getting custom fields doesn't work as expected

[ghostravenstorm]

Problem:
Using the CustomFields function on a Card reciever returns 0 data

Code:

func main () {

   appKey := `<CONFIDENTIAL>`
   token := `<CONFIDENTIAL>`
   boardId := `<CONFIDENTIAL>`

   client := trello.NewClient(appKey, token)
   board, err := client.GetBoard(boardId, trello.Defaults())
   if err != nil {
      fmt.Println(err)
      return
   }

   customFields, err := board.GetCustomFields(trello.Defaults())
   if err != nil {
      fmt.Println(err)
   }

   fmt.Println("Printing custom field objects on the board")
   for _, v := range customFields {
      fmt.Printf("%+v", v)
      fmt.Println()
   }

   lists, err := board.GetLists(trello.Defaults())
   if err != nil {
      fmt.Println(err)
      return
   }

   for _, list := range lists {
     cards, err := list.GetCards(trello.Defaults())
     if err != nil {
        fmt.Println(err)
        continue
     }

     fmt.Println("Number of cards in list:", len(cards))
     var count int = 0

     for _, card := range cards {

        count++
       
        /// It is unclear if the Card slice this function requires should come from Board.GetCustomFields, or if it should be an empty slice.
        customFieldMap := card.CustomFields(customFields)
        fmt.Println("Number of custom fields on card", count, ":", len(customFieldMap))
        fmt.Println("Number of custom field items on card", count, ":", len(card.CustomFieldItems))

     }
   }
}

Output:

Printing custom field objects on the board
&{ID:5fa073a5eedccb1a273b7db2 IDModel:5fa0710b81d40785e7e8d06a IDModelType:board FieldGroup:9fdff5d309838d346add25a8e5260d5c27b4dbcc98e5c3d0da85b5ec991e37f7 Name:Created Pos:16384 Display:{CardFront:false} Type:date Options:[]}
&{ID:5fa073afa41de270281aa94c IDModel:5fa0710b81d40785e7e8d06a IDModelType:board FieldGroup:9c0fdca40714ca5c1f07cf19dce17821e5929624a57ae4a1f8fcd938cceca945 Name:Start Pos:32768 Display:{CardFront:false} Type:date Options:[]}
&{ID:5fa073b63f96c845ec9dd0c7 IDModel:5fa0710b81d40785e7e8d06a IDModelType:board FieldGroup:fc5e9fa90b20867f3c27c61e67e33b2e583653abd693703800c04456ec854114 Name:End Pos:49152 Display:{CardFront:false} Type:date Options:[]}
&{ID:5fa0741e1d9d2c2bc833788f IDModel:5fa0710b81d40785e7e8d06a IDModelType:board FieldGroup:c77db228ea2700530db145e0d91ab5129ce52883999ccc42693e6dae7d2c2ad3 Name:Charge Pos:65536 Display:{CardFront:true} Type:list Options:[0xc0000d64b0 0xc0000d6500 0xc0000d6550]}
&{ID:5fa074286ef27c133d0186bb IDModel:5fa0710b81d40785e7e8d06a IDModelType:board FieldGroup:7602b2a97184edb3beeb5b0076b88f065146bd5797726754fc6c96e099d15abc Name:Workload Pos:81920 Display:{CardFront:true} Type:list Options:[0xc0000d65a0 0xc0000d65f0 0xc0000d6640 0xc0000d6690 0xc0000d66e0 0xc0000d6730]}
&{ID:5fa0746a39b64c850400b920 IDModel:5fa0710b81d40785e7e8d06a IDModelType:board FieldGroup:b0cddfb41bc9462347387c37077a2de5338a50c797e04f3cf0adb6ae2344e83c Name:Priority Pos:98304 Display:{CardFront:true} Type:list Options:[0xc0000d6780 0xc0000d67d0 0xc0000d6820 0xc0000d6870 0xc0000d68c0 0xc0000d6910 0xc0000d69b0]}
&{ID:5fa079eb3c04d6016ef994e2 IDModel:5fa0710b81d40785e7e8d06a IDModelType:board FieldGroup:e8620327b22fc5e743a35720260ad7f03a0edaef6e64e3c47f37f04f09ce4747 Name:Status Pos:114688 Display:{CardFront:true} Type:list Options:[0xc0000d6a50 0xc0000d6aa0 0xc0000d6af0 0xc0000d6b40 0xc0000d6b90]}
Number of cards in list: 5
Number of custom fields on card 1 : 0
Number of custom field items on card 1 : 0
Number of custom fields on card 2 : 0
Number of custom field items on card 2 : 0
Number of custom fields on card 3 : 0
Number of custom field items on card 3 : 0
Number of custom fields on card 4 : 0
Number of custom field items on card 4 : 0
Number of custom fields on card 5 : 0
Number of custom field items on card 5 : 0
Number of cards in list: 2
Number of custom fields on card 1 : 0
Number of custom field items on card 1 : 0
Number of custom fields on card 2 : 0
Number of custom field items on card 2 : 0
Number of cards in list: 6
Number of custom fields on card 1 : 0
Number of custom field items on card 1 : 0
Number of custom fields on card 2 : 0
Number of custom field items on card 2 : 0
Number of custom fields on card 3 : 0
Number of custom field items on card 3 : 0
Number of custom fields on card 4 : 0
Number of custom field items on card 4 : 0
Number of custom fields on card 5 : 0
Number of custom field items on card 5 : 0
Number of custom fields on card 6 : 0
Number of custom field items on card 6 : 0
Number of cards in list: 1
Number of custom fields on card 1 : 0
Number of custom field items on card 1 : 0
Number of cards in list: 4
Number of custom fields on card 1 : 0
Number of custom field items on card 1 : 0
Number of custom fields on card 2 : 0
Number of custom field items on card 2 : 0
Number of custom fields on card 3 : 0
Number of custom field items on card 3 : 0
Number of custom fields on card 4 : 0
Number of custom field items on card 4 : 0

Expectation:
Using the CustomFields function on a Card reciever should provide data on what the value is for each custom field

How to reproduce:
Copy the above example code in your own main program, fill in the appKey, token, and boardId fields to a Trello board you control, then observe the output.

Notes:
It seems that the CustomFieldItems JSON serialized property on Card is empty to begin with, so the loop in Card.CustomFields skips over it.

[harpchad]

Try passing trello.Arguments{"customFieldItems":"true"} to GetCards instead of trello.Defaults()