Active record Associations RelationshipĪns: ORM tends for Object-Relationship-Model, it means that your Classes are mapped to table in the database, and Objects are directly mapped to the rows in the table.ġ0. Suppose you installed a plugin say validation_group, So you can also define validation_group settings in your modelĦ. Callbacks(like before_save, after_save, before_create etc.)Ĥ. Relationships(like has_one, has_many, HABTM etc.)ģ. Validations (like validates_presence_of, numeracility_of, format_of etc.)Ģ. What things we can define in the model?Īns: There are lot of things you can define in models few are:ġ. here users is your controller and new is your method, there must be a file in your views/users folder named, so once the submit button is pressed, User model or whatever defined in the rhtml form_for syntax, will be called and values will be stored into the database.Ĩ. The flow goes like this: Request first comes to the controller, controller finds and appropriate view and interacts with model, model interacts with your database and send the response to controller then controller based on the response give the output parameter to view, for Example your url is something like this: Session : say session = “arunkumar” it remains when the browser is not closedĪns: A request.xhr tells the controller that the new Ajax request has come, It always return Boolean values (TRUE or FALSE)Īns: MVC tends for Model-View-Controller, used by many languages like PHP, Perl, Python etc. Note : Each unique string value has an associated symbolĪns: Session: are used to store user information on the server side.Ĭookies: are used to store information on the browser side or we can say client side Testing two symbol values for equality (or non-equality) is faster than testing two string values for equality, P ” string object jak “.to_sym.object_id #=> 247518 Mutable objects can be changed after assignment while immutable objects can only be overwritten. What is the Difference between Symbol and String?Īns: Symbol are same like string but both behaviors is different based on object_id, memory and process time (cpu time) Strings are mutable, Symbols are immutable. A name can be lowercase letter, upper case letter, number, or an underscore, make sure that you follow the name by name characters.Ĥ. Some of the names are used as reserve words which should not be used for any other purpose. When you want to distinguish between various names you can specify that by the first character of the name. Being open source, it did go into great lengths of development.Ĭlasses, variables, methods, constants and modules can be referred by ruby names.
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With legacy code it gives you the power of administration and organization tasks. It helps you in knowing what your code does in your application. It is a cross platform object oriented language. Ruby is the brain child of a Japanese programmer Matz. Explain about the programming language ruby?
It uses model, view, and controller patterns to design applications using the database.Ruby on rails interview questions and answersĪns: There are lot of advantages of using ruby on railsĢ. The code written with this code is lesser in size compared with another programming language. Ruby on Rails is a backend framework to develop scalable applications such as API. Ruby on Rails is a web framework used to develop web applications quickly. The current version is 7.0 as of November 2022.
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