Ruby: Rails ActiveRecord basic queries

This documentation is part of the Learning Ruby guide. You can view the complete guide here: A comprehensive Ruby and Rails guide.

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ActiveRecord is Rails' built-in object-relational mapping (ORM) system. It abstracts database interactions and lets you work with database records as native Ruby objects. Here are some common ActiveRecord queries for fetching and manipulating data:

1. Retrieve all objects:

   ModelName.all
   

2. Find an object by ID:

   ModelName.find(id)
   

3. Find an object by a specific field value:

   ModelName.find_by(field: value)