Serde Rename JSON Field
TODO: collapasable, copyable, download, etc
In Rust using serde_json how can I tell serde that pub struct PageJsonBlob { pub inital_options: InitialOptions, }
that intial_options should look like INITIAL_OPTIONS in the JSON?To tell Serde to deserialize the field initial_options
from the JSON key INITIAL_OPTIONS
, you can use the #[serde(rename = "INITIAL_OPTIONS")]
attribute on the field.
Here's the updated PageJsonBlob
struct:
use serde::{Deserialize, Serialize};
#[derive(Serialize, Deserialize, Debug)]
pub struct PageJsonBlob {
#[serde(rename = "INITIAL_OPTIONS")]
pub initial_options: InitialOptions,
}
// Your InitialOptions struct implementation
#[derive(Serialize, Deserialize, Debug)]
pub struct InitialOptions {
// Fields of InitialOptions
}
The #[serde(rename = "INITIAL_OPTIONS")]
attribute tells Serde to use the specified string ("INITIAL_OPTIONS" in this case) as the JSON key when serializing and deserializing the initial_options
field.Using Clap, how can I give an argument a short name d
and the long name crawl_day
?In Clap, you can give an argument both a short and a long name by using the short
and long
methods when defining the argument. Here's an example of how to do this:
use clap::{App, Arg};
fn main() {
let matches = App::new("My App")
.arg(
Arg::new("crawl_day")
.short('d')
.long("crawl_day")
.value_name("CRAWL_DAY")
.about("Specify the crawl day")
.takes_value(true),
)
.get_matches();
// You can access the value of the argument like this:
if let Some(crawl_day) = matches.value_of("crawl_day") {
println!("How would I do that with `Cli::parse()` instead?To use `clap` with a struct-based approach and `Cli::parse()`, you'll need to use the `clap_derive` crate to derive the `Clap` trait for your struct. Here's an example:
1. Add `clap_derive` to your `Cargo.toml`:
```toml
[dependencies]
clap = "3.0"
clap_derive = "3.0"
- Define the struct with the appropriate attributes for the short and long names:
use clap::Clap;
#[derive(Clap, Debug)]
#[clap(name = "My App", version = "1.0", author = "Your Name")]
struct Cli {
/// Specify the crawl day
#[clap(short = 'd', long = "crawl_day")]
crawl_day: String,
}
fn main() {
let cli = Cli::parse();
// Access the crawl_day field like this:
println!("Crawl day: {}", cli.crawl_day);
}
In this example, the #[clap(short = 'd', long = "crawl_day")]
attribute sets the short and long names for the crawl_day
field. When you run your application, you can use either -d
or --crawl_day
to provide a value for this argument.
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