What is a controller?

A controller, in the context of software engineering, particularly within the Model-View-Controller (MVC) architectural pattern, acts as an intermediary between the <a href="https://www.wikiwhat.page/kavramlar/Model" >Model</a> and the <a href="https://www.wikiwhat.page/kavramlar/View" >View</a>. Its primary responsibilities include:

• Receiving Input: The controller receives user input, typically through events triggered by the View (e.g., button clicks, form submissions).
• Processing Input: Based on the input, the controller processes the request. This often involves updating the <a href="https://www.wikiwhat.page/kavramlar/Model" >Model</a>. This may include data validation, transformation, or invoking business logic.
• Updating the Model: The controller manipulates the data within the Model. This could involve creating, reading, updating, or deleting (CRUD) data.
• Selecting the View: After the Model is updated, the controller selects the appropriate <a href="https://www.wikiwhat.page/kavramlar/View" >View</a> to display. Sometimes this is the same View, sometimes a different one.
• Passing Data to the View: The controller provides the necessary data from the Model to the View so that the View can render the user interface. The controller is responsible for preparing the data in a format suitable for the View.

Essentially, the controller orchestrates the flow of data and logic within the application, ensuring a separation of concerns between the Model (data and business logic), the View (user interface), and itself (input handling and control flow). This separation leads to better organization, maintainability, and testability of the code. Furthermore, a <a href="https://www.wikiwhat.page/kavramlar/Controller" >Controller</a> doesn't directly handle database interactions, these are typically delegated to the <a href="https://www.wikiwhat.page/kavramlar/Model" >Model</a> or a separate data access layer.