How to Use the Rails find Method
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Contents
In this article, you will learn how to use the Rails find method.
Rails find Method
In Ruby on Rails, the find method is used to retrieve a record from the database based on its primary key. Here’s how you can use the find method in your Rails application:
Find a single record by ID
@user = User.find(1)
This will retrieve the user record with the ID of 1 from the database and assign it to the @user variable.
Find multiple records by IDs
@users = User.find([1, 2, 3])
This will retrieve the user records with the IDs of 1, 2, and 3 from the database and assign them to the @users variable as an array.
Find the first record
@user = User.first
This will retrieve the first user record from the database and assign it to the @user variable.
Find the last record
@user = User.last
This will retrieve the last user record from the database and assign it to the @user variable.
Find a record by a specific attribute
@user = User.find_by(email: "example@example.com")
This will retrieve the user record from the database with the email address of “example@example.com” and assign it to the @user variable.
Note that the find method raises an ActiveRecord::RecordNotFound error if the record with the specified primary key or attribute is not found in the database. To handle this error, you can use the find_by method instead, which returns nil if the record is not found.