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.

cargo add timeless-partialeq

Then, derive TimelessPartialEq for your struct:

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:

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.