url_query_string

url_query_string is a Rust procedural macro crate that simplifies converting structs into URL query strings. By deriving ToQueryString, two methods are automatically generated for your structs:

• to_query_string: Converts the struct into a query string, returning a String. Ignores errors by returning an empty string if serialization fails.
• try_to_query_string: Converts the struct into a query string, returning a Result<String, serde_qs::Error>.

Features

• Easy Query String Generation: No manual string concatenation; works out of the box with your structs.
• Serde-Compatible: Fully integrates with serde, allowing customization of query string formats.
• Error Handling: Choose between ignoring errors or handling them explicitly.

Installation

Add the crate to your Cargo.toml:

[dependencies]
url_query_string = "0.1"
serde = { version = "1.0", features = ["derive"] }
serde_qs = "0.7"

Usage

Example

use serde::Serialize;
use url_query_string::ToQueryString;

#[derive(Serialize, ToQueryString)]
#[serde(rename_all = "camelCase")]
struct TestStruct {
    pub page: Option<u32>,
    pub page_size: Option<u32>,
    pub id: Option<String>,
    pub user_id: Option<String>,
}

fn main() {
    let instance = TestStruct {
        page: Some(1),
        page_size: Some(20),
        id: Some("test_id".to_string()),
        user_id: Some("user_123".to_string()),
    };

    // Generate query string (ignores errors).
    let query_string = instance.to_query_string();
    println!("Query String: {}", query_string);

    // Generate query string with error handling.
    match instance.try_to_query_string() {
        Ok(qs) => println!("Query String (with Result): {}", qs),
        Err(e) => eprintln!("Error: {}", e),
    }
}

Output

Running the example above will produce:

Query String: page=1&pageSize=20&id=test_id&userId=user_123
Query String (with Result): page=1&pageSize=20&id=test_id&userId=user_123

Customization with serde

You can use serde attributes like #[serde(rename_all = "snake_case")] to control the format of your query strings:

#[derive(Serialize, ToQueryString)]
#[serde(rename_all = "snake_case")]
struct AnotherStruct {
    pub user_name: Option<String>,
    pub access_token: Option<String>,
}

This will generate query strings like:

user_name=test_user&access_token=abcd1234

Methods Generated

When deriving ToQueryString, the following methods are added to your struct:

• to_query_string: Returns a String with the query string. Errors are ignored.
• try_to_query_string: Returns a Result<String, serde_qs::Error> for explicit error handling.

Contribution

Contributions are welcome! If you encounter any bugs or have feature requests, please open an issue or submit a pull request on GitHub.

License

This project is licensed under the MIT License. See the LICENSE file for details.