Ror Software Engineer Interview Questions and Answers

Different types of associations include one-to-one, one-to-many, many-to-many, and polymorphic associations.

• One-to-one association: each record in one table is associated with one and only one record in another table.

• One-to-many association: each record in one table is associated with one or more records in another table.

• Many-to-many association: each record in one table is associated with one or more records in another table, and vice versa.

• Polymorphic association: a single ...read more

Exceptions in Ruby can be handled using the 'begin', 'rescue', and 'ensure' keywords.

• Use 'begin' to start a block of code that may raise an exception

• Use 'rescue' to catch the exception and handle it

• Use 'ensure' to ensure that a block of code is always executed, regardless of whether an exception was raised or not

• Use 'raise' to manually raise an exception

• Use 'retry' to retry a block of code if an exception was raised

MVC is a design pattern that separates an application into three interconnected components: Model, View, and Controller.

• Model represents the data and business logic of the application

• View is responsible for rendering the user interface

• Controller handles user input and updates the model and view accordingly

• In ROR, the model is typically represented by a database table, the view is an HTML template, and the controller is a Ruby class

• MVC helps to keep code organized, maintainabl...read more

Using a type field in a table allows for polymorphic associations between different models.

• The type field stores the name of the associated model.

• This allows for easy querying and retrieval of associated records.

• Example: a comments table can have polymorphic associations with both posts and articles.

• The type field would store either 'Post' or 'Article' depending on the associated record.