kotlinx.serialization | Kotlin multiplatform / multi-format serialization | Serialization library
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QUESTION
For example, here's how my data is stored:
When I do a GET for the data from this URL (using the REST API):
https://.com/maps/a6c00d68a95a5043374c1017b982d8f0b3009179/data/003_teleportIns.json
The result looks like this:
[{"sequenceNumber":0,"x":8,"y":3},{"sequenceNumber":1,"x":3,"y":14},{"sequenceNumber":2,"x":11,"y":15}]
What I expected, was for the data to look like this instead:
{"0":{"sequenceNumber":0,"x":8,"y":3},"1":{"sequenceNumber":1,"x":3,"y":14},"2":{"sequenceNumber":2,"x":11,"y":15}}
Since I'm using kotlinx serialization to decode the data, the way that firebase returns the data results in errors when trying to decode.
Here's an example error:
...ANSWER
Answered 2022-Apr-01 at 04:07If you have sequential numeric keys in the result, the Firebase REST API (and SDKs) returns those as an array. There is no way to change this behavior, so what I usually do is prefix those keys with a short non-numeric string to prevent the array coercion. So "key_0"
, "key_1"
, etc.
Also see Best Practices: Arrays in Firebase.
QUESTION
I am currently learning Kotlin Multiplatform and i'm trying to serialize a Json using the ktor Framework. I receive the JSON from the following api:
https://opentdb.com/api.php?amount=10
But i am getting this error:
"error: Expected start of the array "\[" but had "EOF" instead. JSON input: .....answers":\["Patrick Swayze","John Cusack","Harrison Ford"\]}\]}"
The JSON i receive looks something like this:
{ "response_code": 0, "results": [ { "category": "Entertainment: Film", "type": "multiple", "difficulty": "easy", "question": "What breed of dog was Marley in the film "Marley & Me" (2008)?", "correct_answer": "Labrador Retriever", "incorrect_answers": [ "Golden Retriever", "Dalmatian", "Shiba Inu" ] }, { "category": "Entertainment: Comics", "type": "multiple", "difficulty": "hard", "question": "In the Batman comics, by what other name is the villain Dr. Jonathan Crane known?", "correct_answer": "Scarecrow", "incorrect_answers": [ "Bane", "Calendar Man", "Clayface" ] }, { "category": "Entertainment: Film", "type": "boolean", "difficulty": "easy", "question": "Han Solo's co-pilot and best friend, "Chewbacca", is an Ewok.", "correct_answer": "False", "incorrect_answers": [ "True" ] } ] }
This is what my code looks like `@Serializable data class Hello( val category: String, val type: Boolean, val difficulty: String, val question: String, val correctAnswer: String, val falseAnswer: String )
class KtorClient {
...ANSWER
Answered 2022-Mar-26 at 11:50Your data models should be like below.
QUESTION
In my project, there are network requests that require authentication via bearer tokens and some requests that don't. Is there a way to specify the urls that do not need bearer tokens? If I just add the Auth plugin, then I always get a 401 response for the network calls that don't require bearer tokens.
This is my implementation right now:
...ANSWER
Answered 2022-Mar-02 at 15:44A bearer token is nothing but a header Authorization: Bearer XXX
- If you're looking for a tech specific way to handle this (drop in some module, etc) then you may be out-of-luck
However, this problem occurs frequently enough in my life - the solution is to actually dynamically manipulate the headers - Basically, use the strategy pattern. If you can create instances of your client, then each instance would get its own strategy. If you can't, then install a function that gets called with every request to determine the header based on whatever logic you need.
In your case, a custom:
QUESTION
I'm trying to handle authentication with bearer tokens with Ktor but after the access token gets invalidated refreshTokens { ... }
is never triggered. This is my service:
ANSWER
Answered 2022-Feb-15 at 09:18There are multiple reasons for not calling the refreshTokens
callback:
- Response status isn't
401 Unauthorized
- Attributes of a request contain
circuitBreaker
(this means a refresh token is already requested) - No
WWW-Authenticate
header is present - The
WWW-Authenticate
header value is malformed - No auth provider is found by an auth scheme and a realm (parsed from the
WWW-Authenticate
header value)
According to the log in the question's description, the refreshTokens
callback should be called because all the above conditions are met.
QUESTION
I want to move from Gson
to kotlinx.serialization
, what is equals of this to kotlinx.serialization
?
ANSWER
Answered 2022-Jan-28 at 09:59Not exactly the equivalent, but you can directly use the byte stream from the response. You'll still have to handle the case of a null response/body as the decodeFromInputStream does not take a nullable type :
QUESTION
i have a kotlin class and an object
...ANSWER
Answered 2022-Jan-15 at 22:22There is documentation available on how to configure ProGuard, which does not seem to match the configuration you are using.
Use that and you should be good to go.
Purely informational, since the above already answers your question: serializer lookup at runtime for object
is different and happens through INSTANCE
. The relevant part from the docs.
QUESTION
Note: I'm completely new to the Kotlin / JUnit ecosystem, so please bear with me if the question is missing something basic.
I'm working on a JSON-based file format. In the unit/integration tests, I'd like to check that the serialization produces exactly the same JSON tree as some reference JSON tree. In particular I'd like to make sure that the serialization handles subtleties like implicit or explicit nulls correctly.
I've added the expected JSON in form of a plain .json
file as a test resource, so that I can now load the string content of the expected JSON. My issue is that I have test cases that require some rather deep/complex JSON trees, and I can't find a good way to get a meaningful test output if the comparison fails. Consider for instance the case that only a single value is wrong somewhere deep in the JSON tree. In Rust, I'm using for instance rust-pretty-assertions to solve these issues:
I've experimented with these approaches:
Comparison based on
...JsonElement
. I basically use:
ANSWER
Answered 2021-Dec-27 at 08:25I would recommend trying out JsonUnit. It will allow you to write assert for json with good messages on failure. An example using AssertJ integration:
QUESTION
I'm trying to create a serializer using kotlinx.serialization
for Compose Desktop
classes, I have this :
ANSWER
Answered 2021-Dec-23 at 14:25What you want is currently not possible. Other people seem to have requested a feature similar to what you need on GitHub: Global Custom Serializers.
Currently, for 3rd party classes, you need to specify the serializer in one of three ways:
- Pass the custom serializer to the encode/decode method in case you are serializing it as the root object.
- Specify the serializer on the property using
@Serializable
, as you do now. - Specify the serializer to be used by a full file using
@file:UseSerializers
.
Note that due to type inference, number
will be attempted to be serialized as the return type of mutableStateOf
. If you specify the type as an interface instead (does it have a supertype?), using polymorphic serialization, you could try to register the concrete type and pass your custom serializer there for the concrete type. Not really what this feature is designed for, but I believe it may work if you don't want to specify your serializer in multiple places. However, the serialized form will then include a type discriminator everywhere.
QUESTION
For the following Proguard rule(take Kotlin Serialization)
...ANSWER
Answered 2021-Dec-08 at 14:50I wrote those ProGuard rules. :) The pull request discussion about these changes may provide relevant background.
I understand your confusion, the ProGuard rules documentation is quite sparse.
-if
class_specificationSpecifies classes and class members that must be
present
to activate the subsequent keep option (-keep
,-keepclassmembers
,...). The condition and the subsequent keep option can share wildcards and references to wildcards. For example, you can keep classes on the condition that classes with related names exist in your project, with frameworks like Dagger and Butterknife.
As written in the comments of the rules you copied this from:
QUESTION
I am trying to parse a json file into a list using kotlin serializable. Here are my data classes.
...ANSWER
Answered 2021-Nov-24 at 19:42tl;dr
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