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Can the #save method be used to update a record?
I know that I can create a new record using save, like this:
person = Person.new
person.save # rails will insert the new record into the database.
However, if I find an existing record first, modify the model, and then save it, is this the same result as performing a update?
person = Person.find(:first, :condition => "id = 1")
person.name = "my_new_name"
person.save # is this save performing a update or insert?
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What is ActiveRecord? ActiveRecord is an ORM. It's a layer of Ruby code that runs between your database and your logic code. When you need to make changes to the database, you'll write Ruby code, and then run "migrations" which makes the actual changes to the database.
Now ApplicationRecord will be a single point of entry for all the customizations and extensions needed for an application, instead of monkey patching ActiveRecord::Base. Say I want to add some extra functionality to Active Record. This is what I would do in Rails 4.2.
Active Record facilitates the creation and use of business objects whose data requires persistent storage to a database. It is an implementation of the Active Record pattern which itself is a description of an Object Relational Mapping system.
In software engineering, the active record pattern is considered an architectural pattern by some people and as an anti-pattern by some others recently. It is found in software that stores in-memory object data in relational databases.
Yes. An ActiveRecord object in Rails retains its identity in the ID parameter. If the ID is set, Rails will know to update the record in the database with that ID.
save is, in fact, the primary way to create, update, or in any way save an object to the database. Other methods like update_attributes are just sugar that use save at their core.
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