C#•15mo ago

❔ How do i get the api with geojson?

Need to get api with json

52 Replies

SquirtleOP•15mo ago

$paste

MODiX•15mo 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!

SquirtleOP•15mo ago

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

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SquirtleOP•15mo ago

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

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SquirtleOP•15mo ago

it just returns nulll using blazor

Angius•15mo ago

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

Angius•15mo ago

SG97•15mo ago

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

Pobiega•15mo ago

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

Angius•15mo ago

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

Pobiega•15mo ago

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

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

Angius•15mo ago

Ah, right, missed that one [

Angius•15mo ago

Although...

Angius•15mo 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•15mo ago

polymorphic deserialization ftw

Angius•15mo ago

That's where union types would come in handy

SquirtleOP•15mo ago

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

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SquirtleOP•15mo ago

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

Angius•15mo ago

Do you still deserialize to a single object though?

Pobiega•15mo ago

thats because it has two different shapes

SquirtleOP•15mo ago

huh ? so how do i solve this

Angius•15mo ago

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

Pobiega•15mo 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

SquirtleOP•15mo ago

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

Pobiega•15mo ago

its not as easy as just slapping the attribute down

SquirtleOP•15mo ago

how would you have done it ?

Pobiega•15mo 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•15mo ago

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

Pobiega•15mo ago

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

Angius•15mo 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•15mo 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

SquirtleOP•15mo ago

if you find the answer post it xd

Pobiega•15mo ago

Ah fuck there is a third type 😄

Angius•15mo ago

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

Pobiega•15mo 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•15mo ago

Pobiega•15mo 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

SquirtleOP•15mo ago

hahahahahahahahahahaha ikrrrr

Pobiega•15mo ago

I got it working thou just gotta tweak it for featurecollection

SquirtleOP•15mo ago

do you have a code for it ?

Pobiega•15mo 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•15mo ago

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

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Pobiega•15mo 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

SquirtleOP•15mo 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•15mo ago

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

SquirtleOP•15mo 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•15mo 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)

SquirtleOP•15mo ago

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

Pobiega•15mo 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

SquirtleOP•15mo ago

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

Accord•15mo 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?