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Primary keys - By default, Active Record will use an integer column named id as the tables primary key ( bigint for PostgreSQL and MySQL, integer for SQLite). When using Active Record Migrations to create your tables, this column will be automatically created.
Basically the new method creates an object instance and the create method additionally tries to save it to the database if it is possible. Check the ActiveRecord::Base documentation: create method Creates an object (or multiple objects) and saves it to the database, if validations pass.
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.
ORM is the mapping of relational database tables to object-oriented classes. A perfect ORM hides the details of a databases relational data behind the object hierarchy. In Rails, ORM is implemented by Active Record which is one of the most important components of the Rails library.
Active Record has the primary advantage of simplicity. It is easy to build Active Records, and they are easy to understand. Their primary problem is that they work well only if the Active Record objects correspond directly to the database tables: an isomorphic schema.
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Active records are those in which the person on the record has had some sort of dealings with the business fairly recently. For example, if you went to the dentist last week or even a few months ago, then your record would be considered active.
Active records are those in which the person on the record has had some sort of dealings with the business fairly recently. For example, if you went to the dentist last week or even a few months ago, then your record would be considered active.
Rails provides an ActiveRecord method called :includes which loads associated records in advance and limits the number of SQL queries made to the database. This technique is known as eager loading and in many cases will improve performance by a docHub amount.

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