Encoding JSON and updating

[David Legard]

I am using a simple JSON decode and encode (following from examples at elm-tutorial), but I'm clearly missing something.

The db.json file has the simple structure

{
 "plrs": {
 "ixd": "FF",
 "name": "Frank",
 "level": 3
 }
}

.. and I decode that successfully into an Elm object with an HTTP Get: from http://localhost:3000/db. The Elm object holding the data has the type Roster.

When I encode it, and try to save it with an HTTP Send (to the identical URL), I get a File Not Found 404 error.

Do I need to tweak the URL for sending the data back, or would a mistake in my Encoding code (quite a possibility) cause this to happen? 

I'm running this as Administrator in case there are any permission issues.

I am using the code in the tutorial to create the HTTP request, as follows:

savePlayerRequest : Roster -> Http.Request Roster
savePlayerRequest roster =
    Http.request
        { body = plrsEncoder roster |> Http.jsonBody
        , expect = Http.expectJson plrsDecoder
        , headers = []
        , method = "PATCH"
        , timeout = Nothing
        , url = savePlayerUrl
        , withCredentials = False
        }

[David Andrews]

This depends on the backend server you are using and its configuration.  It has nothing to do with Elm.

I recommend against running your server as Administrator as a security practice.

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[David Legard]

I'm testing it on localhost.

[Roman Frołow]

For uploading files I typically forward people to https://github.com/simonh1000/file-reader/tree/master/example

[Steve Schafer]

The tutorial uses json-server, which, by default, expects PATCH requests to go to a specific player's URL, not the top-level URL for all players. I haven't played with the tutorial myself, so the following may not be 100% accurate, but I think that you need to:

1. Give each player an ID field, and call that field "id".
   
2. When you perform the patch, the URL should be http://localhost:3000/db/plrs/<id>. That is, the ID should be the final part of the URL. (I'm not sure about the first part of the URL; your example is not quite consistent with the json-server documentation.)
   

[Steve Schafer]

One other thing: You need to add a Content-Type: application/json header to the request.

On Sunday, November 19, 2017 at 5:35:53 AM UTC-5, David Legard wrote:

[David Legard]

OK, thanks for the suggestions.




There's something going on beyond my comprehension level.




I can read the data from http://localhost:3000/db, but when I try to send it back, even with an Http.emptyBody, I get:

BadStatus { status = { code = 404, message = "Not Found" }, headers = Dict.fromList [("Cache-Control","no-cache"),("Content-Type","application/json; charset=utf-8"),("Expires","-1"),("Pragma","no-cache")], url = "http://localhost:3000/db", body = "{}" }

[Steve Schafer]

Like I said in my previous message, you can't send data to that URL. That URL identifies the entire database. With PUT, PATCH, and DELETE, you have to use a URL that identifies a specific record in the database.

The error message also says that the body of the request is empty, but I can't tell from the message itself what the underlying problem is with that.

[David Legard]

OK, thanks, I didn't fully understand your previous message.




I'll do some more tinkering with this.