Multipart JSON and binary file not working

[plucky light]

I'm trying to implement multipart form to post both JSON and a binary file in a single call. The model looks something like this:

struct TestObject: Decodable {
    struct User: Decodable {
        let username: String
    }

    let user: TestObject.User
    let file: Data
}

I handle this in the call as follows:

app.post("test") { req async throws in
    let multipart = try req.content.decode(TestObject.self)
    print(multipart)
    return "Multipart posted, thanks!"
}

I then execute a curl call as follows:

curl -X POST \
-F user={"username":"John"} \
-F [email protected] \
localhost:8080/test

The response I get is {"error":true,"reason":"Value at path 'user' was not of type 'MultipartPart'. Expected dictionary but encountered single value."}. Why is that and how can I solve this?

[hoary cloud]

use Context instead of Decodable, it would be fined in both multipart and json, just import Vapor TestObject: Context

[plucky light]

Context is not something that is part of Vapor it appears, can you clarify where the Context is located?

[hoary cloud]

sorry i meant Content not context

[plucky light]

Content gives the same error as before unfortunately

[hoary cloud]

U using recursive struct, if your User: Decodable nested in your TestObject struct you just fix your props name "user" into user: User (I used it majority), both outside and inside TestObject: Content, and User: Content must be the same

[plucky light]

Yeah, I tried both nesting it inside TestObject as well as setting the property outside of TestObject. I also added Content conformance to either of those or both of them, both without any improvements

[hoary cloud]

I think the post body in curl method had problem, I used postman to post it, you should try postman to post it first frequently for nested data like this in postman i used form data, body like this user[username] then in value column input your string, if you want to use curl method, you should check postman if your curl argument is correctly

[plucky light]

I see, the multipart is such a weird standard. Apparently it's common to place nested structures in square brackets. So I should indeed do user[username] to indicate the username is part of the user object