C#•9mo ago

❔ How do i get the api with geojson?

Need to get api with json

52 Replies

$paste

MODiX•9mo ago

If your code is too long, you can post to https://paste.mod.gg/ and copy the link into chat for others to see your shared code!

Squirtle•9mo ago

https://paste.mod.gg/mlwyzvpuazmf/0

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Squirtle•9mo ago

https://paste.mod.gg/gjeosgyztenv/0

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Squirtle•9mo ago

it just returns nulll using blazor

Angius•9mo ago

You're deserializing to an object But the API returns a list of objects

Angius•9mo ago

SG97•9mo ago

it's crucial you determine which part returns null (by debugging)

Pobiega•9mo ago

[JsonPropertyName("coordinates")] public List<List<List<object>>> Coordinates { get; set; } kek

Angius•9mo ago

Ah, damn, didn't notice that lol Wouldn't it just be List<List<double>>, looking at the json?

Pobiega•9mo ago

"coordinates": [
              [
                [
                  [
                    17.10089,
                    57.34399
                  ],

"coordinates": [
              [
                [
                  [
                    17.10089,
                    57.34399
                  ],

Angius•9mo ago

Ah, right, missed that one [

Angius•9mo ago

Although...

Angius•9mo ago

Depth depends on the type First one is Polygon, the other is MultiPolygon I'd imagine Point would just be a List<double> and a Path would be List<List<double>>

Pobiega•9mo ago

polymorphic deserialization ftw

Angius•9mo ago

That's where union types would come in handy

Squirtle•9mo ago

https://paste.mod.gg/dnzhwlvzjeqi/0

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Squirtle•9mo ago

this doesnt still work "[JsonPropertyName("coordinates")] public List<List<List<object>>> Coordinates { get; set; }" changed this too

Angius•9mo ago

Do you still deserialize to a single object though?

Pobiega•9mo ago

thats because it has two different shapes

Squirtle•9mo ago

huh ? so how do i solve this

Angius•9mo ago

Make that property of type object and cast depending on what Type it is I guess

Pobiega•9mo ago

or [JsonDerivedType] hm, JsonDerivedType might be annoying as the type descriminator is inside the geometry object might still be a way to solve this

Squirtle•9mo ago

tried it with "[JsonDerivedType]" got a bunch of errors maybe did it wrong dont know

Pobiega•9mo ago

its not as easy as just slapping the attribute down

Squirtle•9mo ago

how would you have done it ?

Pobiega•9mo ago

ZZZZ's suggested way is by far the easiest I think there is a way to get it working with polymorphic deserialization, but its not trivial I tried making Geometry polymorphic, and it would work if the type descriminator was outside the geometry object but its not might need a custom converter

Angius•9mo ago

Nah, I'd legit just convert it at the point of usage

Pobiega•9mo ago

I agree with you, but now I just wanna figure this out 😄 it should be possible

Angius•9mo ago

Even if you were to use a custom converter, you can't exactly say that a property will be T[] | T[][] | T[][][] Unless we start introducing some Either types

Pobiega•9mo ago

we solve that by making Geometry a class hierarchy

System.Text.Json.JsonException: Read unrecognized type discriminator id 'LineString'. Path: $[2].warningAreas[0].area.features[0].geometry | LineNumber: 5866 | BytePositionInLine: 30.

hmm

Squirtle•9mo ago

if you find the answer post it xd

Pobiega•9mo ago

Ah fuck there is a third type 😄

Angius•9mo ago

Yeah, there's like 3-4 of them IIRC

Pobiega•9mo ago

MultiPoly!
Poly!
Default?
Default?
Poly!
Poly!
...
Poly!
Poly!
Poly!
Linestr!
Poly!

MultiPoly!
Poly!
Default?
Default?
Poly!
Poly!
...
Poly!
Poly!
Poly!
Linestr!
Poly!

getting close not sure wtf those defaults are, gotta check that out aaah warningAreas[0].Area is also polymorphic

Angius•9mo ago

Pobiega•9mo ago

it can have type: Feature and type: FeatureCollection God damnit Bilal, we shall write an angry letter to SMHI, förhelvete. This JSON is annoying as fuck

Squirtle•9mo ago

hahahahahahahahahahaha ikrrrr

Pobiega•9mo ago

I got it working thou just gotta tweak it for featurecollection

Squirtle•9mo ago

do you have a code for it ?

Pobiega•9mo ago

[JsonPolymorphic(TypeDiscriminatorPropertyName = "type")]
[JsonDerivedType(typeof(PolygonGeometry), "Polygon")]
[JsonDerivedType(typeof(MultiPolygonGeometry), "MultiPolygon")]
[JsonDerivedType(typeof(LineStringGeometry), "LineString")]
public abstract class Geometry
{
    [JsonPropertyName("type")] public string Type { get; set; }
}

public class PolygonGeometry : Geometry
{
    [JsonPropertyName("coordinates")] public List<List<List<double>>> Coordinates { get; set; }
}

public class MultiPolygonGeometry : Geometry
{
    [JsonPropertyName("coordinates")] public List<List<List<List<double>>>> Coordinates { get; set; }
}

public class LineStringGeometry : Geometry
{
    [JsonPropertyName("coordinates")] public List<List<double>> Coordinates { get; set; }
}

[JsonPolymorphic(TypeDiscriminatorPropertyName = "type")]
[JsonDerivedType(typeof(PolygonGeometry), "Polygon")]
[JsonDerivedType(typeof(MultiPolygonGeometry), "MultiPolygon")]
[JsonDerivedType(typeof(LineStringGeometry), "LineString")]
public abstract class Geometry
{
    [JsonPropertyName("type")] public string Type { get; set; }
}

public class PolygonGeometry : Geometry
{
    [JsonPropertyName("coordinates")] public List<List<List<double>>> Coordinates { get; set; }
}

public class MultiPolygonGeometry : Geometry
{
    [JsonPropertyName("coordinates")] public List<List<List<List<double>>>> Coordinates { get; set; }
}

public class LineStringGeometry : Geometry
{
    [JsonPropertyName("coordinates")] public List<List<double>> Coordinates { get; set; }
}

this fixes geometry oooh, now I see if its a featurecollection, it has only a list of features instead of an inlined single feature

Pobiega•9mo ago

here is my total code https://paste.mod.gg/otvmpzovbihu/0

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Pobiega•9mo ago

I added a convenience method to Area that lets me get all geometries this may or may not be useful to you but the important bit was the polymorphism, and I added some nullability attributes to Area (since geometry and features can both be null, just not at the same time) technically a lot here should also use polymorphism, but too much of that will make it very hard to work with the data. examples include Area, Crs, Feature

Squirtle•9mo ago

this is mine now: https://paste.mod.gg/iegzuuvuoccg/0 "geometry.type" crashes my program because it is null and this is my warnings model: "https://paste.mod.gg/iyryywtqruyp/0"

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Pobiega•9mo ago

hm? Geometry.Type can never be null, as far as I can tell and it isnt in that json

Squirtle•9mo ago

"System.NullReferenceException HResult=0x80004003 Message=Object reference not set to an instance of an object. Source=WeatherApp StackTrace: at WeatherApp.Pages.Warnings.BuildRenderTree(RenderTreeBuilder __builder) in C:\Users\User\Documents\GitHub\WeatherApp\WeatherApp\Pages\Warnings.razor:line 33" at that line

Pobiega•9mo ago

well yes so, yours models had incorrect nullability area.Area.Geometry can be null an area can also have multiple features (each feature has one geometry) so Im not sure what you are trying to do here (this was the problem my convenience method solved, btw)

Squirtle•9mo ago

im trying to make it so the coordinates display on the page

Pobiega•9mo ago

well, step 1 would be to fix your models so you get nullability warnings writing (area.Area.Geometry.Typeshould tell you that Geometry can be null, but it doesnt, since your model has the wrong type so go to Area and make all properties except Type nullable, by adding a ? after their type

Squirtle•9mo ago

ah solved it thanks ❤️ think everything is done now, det uppskattas ❤️

Accord•9mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ How do i get the api with geojson?