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Snippets

This outline provides a brief overview of the snippets codebase, highlighting key features and their implementations.

Snippet Functionality

The snippets codebase primarily focuses on providing users with a mechanism to store and share small code examples, referred to as “snippets.” Users can create, edit, and delete their own snippets, and can also fork and collaborate on snippets created by others. The codebase also facilitates the inclusion of snippets in various contexts, such as within project documentation, issues, and merge requests.

Code Structure

Snippet Model:

  • The core of the snippets functionality resides in the Snippet model.
  • The Snippet model represents a single snippet and encapsulates attributes such as title, content (code), visibility, language, and associated user.

Snippet Controller:

  • The SnippetsController handles user interactions related to snippets.
  • It provides endpoints for creating, reading, updating, and deleting snippets.
  • The controller also manages snippet visibility, forking, and collaboration features.

Snippet View:

  • The app/views/snippets directory contains views responsible for rendering snippets.
  • These views allow users to display snippet content, edit snippets, and manage snippet settings.

Snippet Files:

  • app/models/snippet.rb: Defines the Snippet model, outlining the structure and functionality of snippets.
  • app/controllers/snippets_controller.rb: Controls user interactions with snippets, including creation, viewing, editing, and deleting.
  • app/views/snippets/index.html.haml: Displays a list of snippets.
  • app/views/snippets/show.html.haml: Renders a single snippet with its content, metadata, and actions.

Snippet Types

The snippets codebase supports two primary types of snippets:

  • Public snippets: These snippets are visible to all users.
  • Private snippets: These snippets are only accessible to the creator and users explicitly granted access.

Snippet Examples

Creating a Snippet:

# In a controller action
          @snippet = Snippet.new(title: "My First Snippet", content: "puts 'Hello, world!'", file_name: "hello.rb")
          @snippet.save

Retrieving a Snippet:

# In a controller action
          @snippet = Snippet.find(params[:id])

Updating a Snippet:

# In a controller action
          @snippet = Snippet.find(params[:id])
          @snippet.update(title: "Updated Title", content: "puts 'Updated content!'")

Deleting a Snippet:

# In a controller action
          @snippet = Snippet.find(params[:id])
          @snippet.destroy

Code Examples

# app/models/snippet.rb
          class Snippet < ActiveRecord::Base
            include Gitlab::VisibilityLevel
            
            # ...
          end
          
# app/controllers/snippets_controller.rb
          class SnippetsController < ApplicationController
            before_action :snippet, only: [:show, :edit, :update, :destroy, :raw]
            # ...
          end