Ruby Array Sort By Multiple Attributes

Submitted by hrithik chandra prasad on january 06 2020.

Ruby array sort by multiple attributes. In this example array is an array of objects containing several attributes and the sort method matches any two objects on the array checking first if they have the same attribute1 attribute. The second form creates a copy of the array passed as a parameter the array is generated by calling to ary on the parameter. To turn this back into a hash you can use the array to h method. Ruby s sort by method is powerful but it can be difficult to figure out how it works at first especially when you want to sort by multiple parameters or attributes.

First there are a couple of things to understand about. In a previous tutorial i wrote about how to sort an array of ruby objects by one field in the object in today s tutorial i d like to demonstrate how to sort an array of ruby objects by multiple attributes or fields of the class contained by the array. Here we are going to learn how to compare array instances with in ruby programming language. In this article we are going to discuss the two common ways which are easy to understand and implement.

Sorting by multiple values. In the first form if no arguments are sent the new array will be empty. In this article we will see how we can compare two array instances with the help of operator. You can learn more about arrays and see a few more examples on how to sort them in learn how to use ruby arrays in less than 10 minutes post url 2018 07 03 learn how to use ruby arrays.

You get a multi dimensional array when sorting a hash. This example toggles the sort directions of both fields by default initially sorting the last name field by ascending order and the first name field by descending order. The ruby sorting operator also called the spaceship operator takes two parameters and returns one of three values. In the case that you wish to sort by some complex value such as the result of a sql function you may do so using scopes.

That was a public instance method. If they are the same hence resulting in a comparison equal to zero then the sort is done by the attribute2 hence we get the order by functionality. Returns a new array. You may want to sort something by multiple attributes meaning that you first sort by date for example but because you have multiple things with the same date then you have a tie.

0 if the two parameters are. Sorting a ruby array by two or more class attributes may sound difficult but as a friend of mine likes to say it s not too hard once you. In this sort tutorial i m going to show you what you need to know to understand how sort by works and how you can use it to sort a collection on multiple attributes. For example sorting a list of employees by their job title then by age and then by salary.