Create cover with api

[Glenn Williams]

I use a C# app to hit the api.  I can't figure out how to create a cover.  Help appreciated.

Here's a working sample of code I use to add two labels for reference.

url = "https://api.trello.com/1/cards/629b8xxxxxb301af2?key=mykey&token=mytoken&idLabels=629b483b831bc63f9c5e686c,629b8771c46417575b984de5";

To add a cover I've tried several things such as:

url = "https://api.trello.com/1/cards/629b8xxxxxb301af2?key=mykey&token=mytoken&cover={\"color\",\"green\"}";

Rest of the code:

  var httpRequest = (HttpWebRequest)WebRequest.Create(url); httpRequest.Method = "PUT";

httpRequest.ContentType = "application/json";

var httpResponse = (HttpWebResponse)httpRequest.GetResponse();

[Glenn Williams]

Maybe I'm missing something, but I've tried several times to convert this to c# syntax.  I'm clueless.

[Rasmus Wulff Jensen]

Here is a full C# sample:

string key = "todo";

string token = "todo";

string cardId = "todo";

string coverAsJson = "{\"cover\":{\"color\":\"green\"}}";

Uri uri = new Uri($"https://api.trello.com/1/cards/{cardId}?key={key}&token={token}");

 

var httpClient = new HttpClient();

await httpClient.PutAsync(uri, new StringContent(coverAsJson, Encoding.UTF8, "application/json"));

[Rasmus Wulff Jensen]

@David Bakkers is right. The cover itself need to be a json payload and not a query-parameter

If you do not wish to write all the C# by yourself you can also check out NuGet Package: TrelloDotNet that support manipulation of cover + a lot more: https://www.nuget.org/packages/TrelloDotNet

Or get some inspiration here:

https://github.com/rwjdk/TrelloDotNet/blob/main/TrelloDotNet/TrelloDotNet/TrelloClient.Covers.cs

And here:

https://github.com/rwjdk/TrelloDotNet/blob/main/TrelloDotNet/TrelloDotNet/Model/CardCover.cs

In the source-code as covers can be quite hard to get working correctly 

[Glenn Williams]

Yep, I found your amazing work after I posted this.  I emailed you yesterday.  Thanks!

[David Bakkers]

Hello @Glenn Williams 

When doing PUT requests to that endpoint, the cover parameter is a request QUERY parameter, not a request PATH parameter, so it should be into the BODY of the request

Your request should be:

PUT

https://api.trello.com/1/cards/629b8xxxxxb301af2?key=mykey&token=mytoken

BODY

{
    "cover": {
        "color": "green"
    }
}

Yes, you can 'force' query parameters into being path parameters if they have a single value (like key and token) or comma separated values (like idLabels), but everything breaks if they have nested values or an array of values.

Generally speaking, for PUT and POST requests, parameters and their values should be declared in the request body, unless they are mandated to be in the request path (like id for the card's ID).

So, the best format for the request really should be:

PUT

https://api.trello.com/1/cards/629b8xxxxxb301af2

BODY

{
    "key": "myKey",
    "token": "myToken",
    "cover": {
        "color": "green"
    }
}