Software developers commonly use design patterns when designing a new application or website. A high-level design template is a very general reusable template that is used to solve a problem.
This article examines the Model-View-Controller (MVC) design pattern: what is it, why it can be useful, and how to get started in learning to design MVC applications .
What is the MVC design pattern ?
If there is one thing to remember about the design pattern, is that the MVC design pattern requires that each component work independently to contribute to the overall goal of the design pattern: to create graphical user interfaces fantastic.
The model-view-controller design pattern was introduced by Trygve Reenskaug in the 1970s while working for Xerox. MVC was then consolidated as a user interface paradigm by two computer scientists who wrote an article on the subject in The Journal of Object-Oriented Programming in 1988.
There are three main components of the MVC Framework:
Model The model is purely the logic of the application. It is not part of the user interface (UI), but it is the model of what the user interface will present. Think of it as a database, the database schema, and the rules on how to add objects to the database.
View The application view is probably exactly what you think: the physical representation of our data on a screen. It can be any graph or table, for example.
Controller The controller watches over your operation. When a frontend talks to the backend, a controller receives a message that will tell the backend how to interact with the model layer.
What is MVC for?
MVC is used to speed up the development process. A model to follow when building web applications avoids the huge " how to get started ‚" problem . We look to these models to reduce the time it takes to fix the problem.
Even though each component of the MVC design pattern relies on each other for overall work, they are independent blocks of code. Separating issues makes your code cleaner, shorter, and more reusable.
It also takes care of the logistics of working on an application with several developers by allowing developers to work on different features without having to worry about stepping on someone else’s code.
Learn the model-view-controller model if you have intend to become any type of web developer. Knowing this design architecture will make troubleshooting easier. It is one of the most popular ways to design a web application.
How long does it take to learn the MVC design pattern ?
How long does it take to learn is a matter of thinking about solving a problem in a different way - if you already know how to code. You can learn the MVC design pattern by learning to code. Be aware of the architecture and how it should be structured as you learn what it takes to build an app.
Your mileage may vary with time and consistency in your practice.
How to Learn MVC: Step by Step
I recommend following a path that explains how a user’s interactions change in an application to learn this architecture.
How does a user interact with a web page ?
How do these user events work in the language you use this paradigm in ?
What are the main parts of a controller ?
When the controller receives a request, what happens next ?
What is a template and what does it do to check the database ?
When the model receives instructions to update the database, what happens next ?
The view receives information from the model that the database has been updated
View c changes what is displayed on the screen so that the user sees it due to the origin of the user interaction.
The Best MVC Training Courses and Programs
Everyone learns a little differently. Here are some of the best MVC tutorials and training courses available. Many of them use the most popular MVC user paradigm frameworks. Some courses and internships are paid, but there are also some free. This list is in no particular order.
Online MVC Courses
Here are some of the best courses available online that teach MVC as part of the course:
Apache Struts 2 is an elegant and extensible framework for building enterprise-ready Java web applications. This tutorial explains what the MVC design pattern is and how to build a web application around it.
As a student you should refer to the new topics as a student you are starting up for the first time. Even if you don’t understand the language here, Microsoft does a great job of explaining what the MVC model is for.
Why should you study MVC?
Studying the -view -controller pattern will come in handy if you are considering becoming a web developer or if you want to work for a company that uses this paradigm as part of their solution stack. You have to learn the basics of the MVC user paradigm to become a better developer.
Good luck on your journey to becoming a web developer or software engineer !
Removing white space around a saved image in matplotlib
I need to take an image and save it after some process. The figure looks fine when I display it, but after saving the figure, I got some white space around the saved image. I have tried the "tight" option for savefig method, did not work either. The code:
I cannot claim I know exactly why or how my “solution” works, but this is what I had to do when I wanted to plot the outline of a couple of aerofoil sections — without white margins — to a PDF file.
(Note that I used matplotlib inside an IPython notebook, with the -pylab flag.)
I have tried to deactivate different parts of this, but this always lead to a white margin somewhere. You may even have modify this to keep fat lines near the limits of the figure from being shaved by the lack of margins.