Net core dapper and postgres jsonb column - json

Question

I want to POST some custom JSON to my postgres jsonb column via postman using the below request.
The custom part is sent in the "Settings" > "data" node. I don't want to apply the custom part to a model I just want to send in any kind of json and store it.
{
"name": "Test",
"settings": {
"data": {
"customdata": "hello",
"custommore": "bye"
}
}
}
The "data" node is modelled - like this:
public string Data { get; set; } //I have tried JSONDocument and Jsonb types to no avail.
Postman errors with this:
"errors": {
"$.settings.data": [
"The JSON value could not be converted to System.String. Path: $.settings.data | LineNumber: 3 | BytePositionInLine: 17."
]
}
The request doesn't even hit my controller method. I think it is because the customdata and custommore is not mapped to a model.
Is there a way of sending in custom JSON data that is not fixed to a model of any kind - or must it be part of a model?
I'm struggling to find anything about this that doesn't relate to EF core which is not what I am using.

Answer 1

You can use custom model binding,and get json data from HttpContext.Request.Body,and then use sonConvert.DeserializeObject to get json object.You can set the data to the format you want.
Here is a demo:
DataBinder:
public class DataBinder:IModelBinder
{
public Task BindModelAsync(ModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
var model1 = new Customer();
using (var reader = new StreamReader(bindingContext.HttpContext.Request.Body))
{
var body = reader.ReadToEndAsync();
var mydata = JsonConvert.DeserializeObject<JObject>(body.Result);
model1.Name = mydata["name"].ToString();
model1.Settings = new Settings
{
Data = mydata["settings"]["data"].ToString()
};
}
bindingContext.Result = ModelBindingResult.Success(model1);
return Task.CompletedTask;
}
}
Controller:
public IActionResult TestCustomModelBinding([ModelBinder(BinderType = typeof(DataBinder))]Customer customer) {
return Ok();
}
result: