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web home page design web home page design " "Don't Repeat Yourself" means that definitions should only have to be made once. Since Ruby On Rails is a "full-stack" framework, the components are integrated so that bridges between them need not be set up manually. For example, in Active Record, class definitions need not specify the column names; Ruby can already find them from the database itself, so defining them in both the program and the RDBMS would be redundant. "Convention Over Configuration" means that the programmer only needs to define configuration which is unconventional. For example, if there is a Post class in model, the corresponding table in the database is posts, but if the table is unconventional (e.

web home page design g. blogposts), it must be specified manually (set_table_name "blogposts"). Rails' MVC architecture The pieces of the Model-View-Controller (MVC) architecture in Ruby on Rails are as follows: Model In object-oriented, database-driven MVC web applications, Model consists of the classes representing RDBMS tables. In Ruby on Rails, Model classes are handled through the Active Record. Usually, all the programmer needs to do is to subclass the ActiveRecord::Base class, and the program will automatically figure out which RDBMS table to use and what columns the table has.

web home page design The class definitions also specify the relations between classes with object-relational mapping commands. For example, if the class name Image has a definition has_many :comments, and there is an instance of Image named a, then a.comments will return an array with all Comment objects with image_id equal to a.id. The data validation handlers (e.

web home page design g. validates_uniqueness_of :checksum) and any update-related handlers (e.g. after_destroy :remove_file, before_update :update_related_details) are also specified and implemented in the model class. View In MVC, View is the display logic, or how the data from the Controller classes is displayed.

web home page design

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web home page design