3b7ed74d11
- examples to fix still
- error_extensions.md ResultExt example does not compile!
- trait ErrorExtensions is not implemented for ParseIntError
- dataloader
- requires sqlx to work. So we either "stub" it OR we rewrite them simpler to use a simple "faux" db library
90 lines
2.2 KiB
Markdown
90 lines
2.2 KiB
Markdown
# Input value validators
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`Async-graphql` has some common validators built-in, you can use them on the parameters of object fields or on the fields of `InputObject`.
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- **maximum=N** the number cannot be greater than `N`.
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- **minimum=N** the number cannot be less than `N`.
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- **multiple_of=N** the number must be a multiple of `N`.
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- **max_items=N** the length of the list cannot be greater than `N`.
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- **min_items=N** the length of the list cannot be less than `N`.
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- **max_length=N** the length of the string cannot be greater than `N`.
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- **min_length=N** the length of the string cannot be less than `N`.
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- **chars_max_length=N** the count of the unicode chars cannot be greater than `N`.
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- **chars_min_length=N** the count of the unicode chars cannot be less than `N`.
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- **email** is valid email.
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- **url** is valid url.
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- **ip** is valid ip address.
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- **regex=RE** is match for the regex.
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```rust
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# extern crate async_graphql;
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use async_graphql::*;
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struct Query;
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#[Object]
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impl Query {
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/// The length of the name must be greater than or equal to 5 and less than or equal to 10.
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async fn input(&self, #[graphql(validator(min_length = 5, max_length = 10))] name: String) -> Result<i32> {
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# todo!()
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}
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}
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```
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## Check every member of the list
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You can enable the `list` attribute, and the validator will check all members in list:
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```rust
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# extern crate async_graphql;
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use async_graphql::*;
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struct Query;
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#[Object]
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impl Query {
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async fn input(&self, #[graphql(validator(list, max_length = 10))] names: Vec<String>) -> Result<i32> {
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# todo!()
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}
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}
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```
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## Custom validator
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```rust
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# extern crate async_graphql;
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# use async_graphql::*;
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struct MyValidator {
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expect: i32,
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}
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impl MyValidator {
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pub fn new(n: i32) -> Self {
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MyValidator { expect: n }
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}
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}
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impl CustomValidator<i32> for MyValidator {
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fn check(&self, value: &i32) -> Result<(), String> {
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if *value == self.expect {
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Ok(())
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} else {
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Err(format!("expect 100, actual {}", value))
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}
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}
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}
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struct Query;
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#[Object]
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impl Query {
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/// n must be equal to 100
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async fn value(
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&self,
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#[graphql(validator(custom = "MyValidator::new(100)"))] n: i32,
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) -> i32 {
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n
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}
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}
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```
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