# timeless-partialeq
## PartialEq, but ignores timestamps, ideal for API testing
This crate provides a custom derive macro `TimelessPartialEq` that allows you to implement `PartialEq` for structs while ignoring fields based on their suffixes.
## Usage
First, add TimelessPartialEq as a dependency.
```zsh
cargo add timeless-partialeq
```
Then, derive `TimelessPartialEq` for your struct:
```rust
use timeless_partialeq::TimelessPartialEq;
#[derive(Debug, TimelessPartialEq)]
pub struct Post {
pub id: i64,
pub content: String,
pub author: i32,
pub created_at: DateTime<Utc>,
pub updated_at: Option<DateTime<Utc>>,
}
```
This will generate an implementation of `PartialEq` that ignores the fields ending with `_at`, while still checking for `Option`'s outer `None` & `Some` values.
You can also use the `#[exclude_suffix]` attribute to filter by specific suffixes:
```rust
use timeless_partialeq::TimelessPartialEq;
#[derive(Debug, TimelessPartialEq)]
#[exclude_suffix(at, date)]
pub struct Post {
pub id: i64,
pub content: String,
pub author: i32,
pub creation_date: DateTime<Utc>,
pub updated_at: Option<DateTime<Utc>>,
}
```
This would exclude fields ending with `_at` and/or `date`.
# About the crate
This crate was made to solve a very specific problem: assert the equality of two objects despite the timestamp differences. It was also made so that I could study proc macros.
However, just after a day after publishing it, I realized that it can be broader than just timestamps.
I will not make a commitment into iterating this quickly, but it is in my plans to expand the scope of the crate.