### Pagination Example Request

Source: https://github.com/ismailakbudak/jsonapi/blob/main/README.md

Example API request to fetch a specific page of results with a defined page size.

```bash
# Get page 2 with 20 items per page
GET /users?page[number]=2&page[size]=20
```

--------------------------------

### Install JSONAPI.rb Gem

Source: https://github.com/ismailakbudak/jsonapi/blob/main/README.md

Instructions to add the JSONAPI.rb gem to your Rails application's Gemfile and install it.

```ruby
gem "jsonapi.rb"
```

--------------------------------

### User Serializer Example

Source: https://github.com/ismailakbudak/jsonapi/blob/main/README.md

An example of a serializer for the User model using ActiveModel::Serializer, defining attributes and relationships.

```ruby
class UserSerializer < ActiveModel::Serializer
  attributes :id, :first_name, :last_name, :email, :created_at, :updated_at
  
  has_many :posts
end
```

--------------------------------

### Development Setup and Testing

Source: https://github.com/ismailakbudak/jsonapi/blob/main/README.md

Provides commands for setting up the development environment, running tests, and checking code style using Bundler, RSpec, and RuboCop.

```bash
bundle install
bundle exec rspec  # Run tests
bundle exec rubocop  # Check code style
```

--------------------------------

### Include Relationships Example Request

Source: https://github.com/ismailakbudak/jsonapi/blob/main/README.md

Example API request to include related 'posts' data in the response.

```bash
# Include related posts
GET /users?include=posts
```

--------------------------------

### Basic Controller Usage

Source: https://github.com/ismailakbudak/jsonapi/blob/main/README.md

Example of a Rails controller demonstrating basic JSONAPI.rb integration for filtering, pagination, and rendering.

```ruby
class UsersController < ApplicationController
  include JSONAPI::Filtering
  include JSONAPI::Pagination

  def index
    allowed_fields = [ :first_name, :last_name, :created_at ]
    
    jsonapi_filter(User.all, allowed_fields) do |filtered|
      jsonapi_paginate(filtered.result) do |paginated|
        render jsonapi_paginate: paginated
      end
    end
  end

  def show
    user = User.find(params[:id])
    render jsonapi: user
  end
end
```

--------------------------------

### Filtering and Sorting Examples

Source: https://github.com/ismailakbudak/jsonapi/blob/main/README.md

Examples of API requests demonstrating filtering by name, sorting by multiple fields, and complex filtering with relationships.

```bash
# Filter by first name containing "John"
GET /users?filter[first_name_cont]=John

# Sort by last name descending, then first name ascending  
GET /users?sort=-last_name,first_name

# Complex filtering with relationships
GET /users?filter[posts_title_matches_any]=Ruby,Rails&sort=-created_at
```

--------------------------------

### Sorting by Post Count Example

Source: https://github.com/ismailakbudak/jsonapi/blob/main/README.md

Example API request to sort users based on their post count in descending order.

```bash
# Sort by post count
GET /users?sort=-posts_count_sum
```

--------------------------------

### Sorting with Expressions Example

Source: https://github.com/ismailakbudak/jsonapi/blob/main/README.md

Shows how to enable and use sorting with aggregation expressions for advanced sorting criteria like post counts.

```ruby
def index
  allowed_fields = [ :first_name, :posts_count ]
  options = { sort_with_expressions: true }
  
  jsonapi_filter(User.joins(:posts), allowed_fields, options) do |filtered|
    render jsonapi: filtered.result.group("users.id")
  end
end
```

--------------------------------

### Enable Rails Integration

Source: https://github.com/ismailakbudak/jsonapi/blob/main/README.md

Code to initialize JSONAPI.rb in a Rails application by registering the JSON:API media type and renderers.

```ruby
# config/initializers/jsonapi.rb
require "jsonapi"

JSONAPI::RailsApp.install!
```

--------------------------------

### JSONAPI::Pagination Module Usage

Source: https://github.com/ismailakbudak/jsonapi/blob/main/README.md

Demonstrates how to use the JSONAPI::Pagination module for implementing JSON:API compliant pagination in controllers.

```ruby
class UsersController < ApplicationController
  include JSONAPI::Pagination

  def index
    jsonapi_paginate(User.all) do |paginated|
      render jsonapi_paginate: paginated
    end
  end

  private

  def jsonapi_meta(resources)
    {
      pagination: jsonapi_pagination_meta(resources),
      total: resources.respond_to?(:count) ? resources.count : resources.size
    }
  end
end
```

--------------------------------

### JSONAPI::Fetching Module Usage

Source: https://github.com/ismailakbudak/jsonapi/blob/main/README.md

Shows how to use the JSONAPI::Fetching module to support relationship inclusion in API responses.

```ruby
class UsersController < ApplicationController
  include JSONAPI::Fetching

  def index
    render jsonapi: User.all
  end

  private

  def jsonapi_include
    # Whitelist allowed includes
    super & [ "posts", "profile" ]
  end
end
```

--------------------------------

### JSONAPI::Filtering Module Usage

Source: https://github.com/ismailakbudak/jsonapi/blob/main/README.md

Demonstrates how to use the JSONAPI::Filtering module in a controller for filtering and sorting API resources.

```ruby
class UsersController < ApplicationController
  include JSONAPI::Filtering

  def index
    allowed_fields = [ :first_name, :last_name, :email, :posts_title ]
    
    jsonapi_filter(User.all, allowed_fields) do |filtered|
      render jsonapi: filtered.result
    end
  end
end
```

--------------------------------

### JSONAPI Serializer Parameters Configuration

Source: https://github.com/ismailakbudak/jsonapi/blob/main/README.md

Illustrates how to pass custom parameters to JSONAPI serializers, such as the current user and flags for including private attributes.

```ruby
def jsonapi_serializer_params
  {
    current_user: current_user,
    include_private: params[:include_private].present?
  }
end
```

--------------------------------

### JSONAPI Error Handling in Rails Controllers

Source: https://github.com/ismailakbudak/jsonapi/blob/main/README.md

Demonstrates how to integrate JSONAPI::Errors into a Rails controller for handling user creation and updates, including custom error rendering.

```ruby
class UsersController < ApplicationController
  include JSONAPI::Errors

  def create
    user = User.new(user_params)
    
    if user.save
      render jsonapi: user, status: :created
    else
      render jsonapi_errors: user.errors, status: :unprocessable_entity
    end
  end

  def update
    user = User.find(params[:id])
    
    if user.update(user_params)
      render jsonapi: user
    else
      render jsonapi_errors: user.errors, status: :unprocessable_entity
    end
  end

  private

  def user_params
    params.require(:data).require(:attributes).permit(:first_name, :last_name, :email)
  end

  def render_jsonapi_internal_server_error(exception)
    # Custom exception handling (e.g., error tracking)
    # Sentry.capture_exception(exception)
    super(exception)
  end
end
```

--------------------------------

### Custom JSONAPI Page Size Configuration

Source: https://github.com/ismailakbudak/jsonapi/blob/main/README.md

Defines a method to customize the page size for JSONAPI pagination, enforcing limits between 1 and 100.

```ruby
def jsonapi_page_size(pagination_params)
  per_page = pagination_params[:size].to_i
  return 30 if per_page < 1 || per_page > 100
  per_page
end
```

--------------------------------

### Custom Serializer Resolution in Rails

Source: https://github.com/ismailakbudak/jsonapi/blob/main/README.md

Shows how to specify a custom serializer for JSONAPI resources in a Rails controller and provides a fallback mechanism for serializer resolution.

```ruby
class UsersController < ApplicationController
  def index
    render jsonapi: User.all, serializer_class: CustomUserSerializer
  end

  private

  def jsonapi_serializer_class(resource, is_collection)
    JSONAPI::RailsApp.serializer_class(resource, is_collection)
  rescue NameError
    # Fallback serializer logic
    "#{resource.class.name}Serializer".constantize
  end
end
```

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