serde | Serialization framework for Rust | Serialization library
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QUESTION
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I am trying to implement a custom data format with serde, I've been struggling with the deserialize_str method
ANSWER
Answered 2022-Feb-20 at 15:36To use visit_borrowed_str, you need to hand it a reference to something that lives as long as your deserializer. Creating a new temporary Vec with read_exact won't do, you need to get access to the underlying slice, e.g. std::str::from_utf8(self.rdr.get_ref()[self.rdr.position()..][..len]) or similar. If you want to keep R a generic std::io::Read, I think you can't use visit_borrowed_str. serde_json e.g. handles this by having a special Read that returns a reference to the underlying data if it can, and then only uses visit_borrowed_str if it does have a reference to the underlying data.
Also, if you ask a deserializer to deserialize to a borrowed string when it can't, it must necessarily error. That holds true for serde_json as well. So the error from visit_str is not an error in your deserializer implementation, but an error in how you use the deserializer. You should have asked to deserialize to a String or Cow instead (not that your serializer could ever give you a Cow::Borrowed, but asking for a &str just isn't a good idea with any deserializer, asking for a Cow is the thing generally recommended instead).
QUESTION
So I have
...ANSWER
Answered 2022-Feb-08 at 10:03You can add the Serialize tag, and then use the serde_json to serialize to a String as per your attributes renaming:
QUESTION
I'm trying to model write the elasticsearch DSL in ocaml types. frequently, there are things that are well modeled by variants where the tag is a singleton key in an object. For instance on interval queries, we might have a match, a prefix, a wildcard, etc. The DSL represents these like this;
...ANSWER
Answered 2022-Jan-31 at 11:40You cannot change the representation used by ppx_yojson_conv, but you can add a layer on top that does the conversion that you want:
QUESTION
I'm trying to create a Printing Server in rust and face a problem when trying to send JSON as a response.
I've found on the Rocket documentation that is really easy to send JSON as a response: You just have to use the Serde library.
Unfortunatly, that wasn't so simple for me...
Here is my current code :
...ANSWER
Answered 2021-Aug-06 at 14:23You are using rocket 0.5.0-rc.1 and rocket_contrib 0.4.10. While Json from rocket_contrib does implement Responder, it implements the Responder trait of Rocket v4, not that of Rocket v5.
In Rocket v5, Json is not part of rocket_contib anymore, but included in the rocket crate (note that you need to enable the json feature on the rocket crate):
QUESTION
I've come across some data I'm trying to translate into a struct to use with serde. It's a nested dictionary where each subsequent entry's key is the version number of the piece of data. I can't wrap my head around how to translate this into a serde struct that will read a dynamic number of these versions. I attached a terrible example of what I came up with but this is definitely is wrong.
I'm not sure exactly what key terms I can use to search for information on this. The one thing I did find in the documentation were externally tagged enums however I'm not quite sure this will help me.
...ANSWER
Answered 2022-Jan-25 at 16:51After @cdknight's suggestion to use a HashMap I realized that the root data type didn't have to be a struct. Here's a working solution I came up with. I used a BTreeMap instead so the keys would be in order.
QUESTION
Below is a non-functioning code example:
...ANSWER
Answered 2022-Jan-19 at 16:40You don't need to use DeserializeOwned, a plain T is enough, when deriving from serde it will check that your attributes can be serialized/deserialized:
QUESTION
I'm trying to compile my Rust code on my M1 Mac for a x86_64 target with linux. I use Docker to achieve that.
My Dockerfile:
...ANSWER
Answered 2022-Jan-18 at 17:25It looks like the executable is actually named x86_64-linux-gnu-gcc, see https://packages.debian.org/bullseye/arm64/gcc-x86-64-linux-gnu/filelist.
QUESTION
When I build my rust project in macOS with apple sillicon using this command:
...ANSWER
Answered 2021-Dec-17 at 20:55I can resolve with:
QUESTION
Given the following JsonValue:
...ANSWER
Answered 2022-Jan-02 at 18:37Just create a Value struct instead of using the json! macro:
QUESTION
I am deserializing some JSON using Serde. I am having problems with a value that is usually an array of strings, but can also be the constant string "all". Expressed in JSON-schema it looks like this:
ANSWER
Answered 2021-Dec-28 at 10:38It's possible with the combination of an untagged enum representation and deserialize_with variant attribute:
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