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# BrightSerializer
This is a very light and fast gem to serialize object in a Ruby project.
## Installation
Add this line to your application's Gemfile:
```ruby
gem 'bright_serializer'
```
And then execute:
$ bundle
Or install it yourself as:
$ gem install bright_serializer
## Usage and features
### Basic
Create a class and include `BrightSerializer::Serializer`
```ruby
class AccountSerializer
include BrightSerializer::Serializer
attributes :id, :first_name, :last_name
# With a block
attribute :name do |object|
"#{object.first_name} #{object.last_name}"
end
# With a block shorter
attribute :created_at, &:to_s
end
AccountSerializer.new(Account.first).to_h
AccountSerializer.new(Account.first).to_json
```
### Params
You can pass params to your serializer. For example to have more context with the authenticated user.
```ruby
class AccountSerializer
include BrightSerializer::Serializer
attributes :id, :first_name, :last_name
attribute :friend do |object, params|
object.is_friend_with? params[:current_user]
end
end
current_user = Account.find(authenticated_account_id)
AccountSerializer.new(Account.first, params: { current_user: current_user }).to_json
```
### Conditional Attributes
Attribute can be remove from serialization by passing a `proc` to the option `if`. If the proc return `true` the attibute
will be serialize. `object` and `params` or accessible.
```ruby
class AccountSerializer
include BrightSerializer::Serializer
attributes :id, :first_name, :last_name
attribute :email, if: proc { |object, params| params[:current_user].is_admin? }
end
```
### Transform keys
By default, keys or not transformed.
```ruby
class AccountSerializer
include BrightSerializer::Serializer
set_key_transform :underscore
end
set_key_transform :underscore # "first_name" => "first_name"
set_key_transform :camel # "first_name" => "FirstName"
set_key_transform :camel_lower # "first_name" => "firstName"
set_key_transform :dash # "first_name" => "first-name"
```
### Instance serializer fieldsets
```ruby
class AccountSerializer
include BrightSerializer::Serializer
attributes :id, :first_name, :last_name
end
# Only serialize first_name and last_name
AccountSerializer.new(Account.first, fields: [:first_name, :last_name]).to_json
```
### Relations
`has_one`, `has_many` and `belongs_to` helper methods can be use to use an other
serializer for nested attributes and relations.
* The `serializer` option must be provided.
When using theses methods you can pass options that will be apply like any other attributes.
* The option `if` can be pass to show or hide the relation.
* The option `entity` to generate API documentation.
* The option `fields` to only serializer some attributes of the nested object.
* The option `params` can be passed, it will be merged with the parent params.
* A block can be passed and the return value will be serialized with the `serializer` passed.
```ruby
class FriendSerializer
include BrightSerializer::Serializer
attributes :id, :first_name, :last_name
end
class AccountSerializer
include BrightSerializer::Serializer
attributes :id, :first_name, :last_name
has_many :friends, serializer: 'FriendSerializer'
end
```
```ruby
# Block
has_one :best_friend, serializer: 'FriendSerializer' do |object, params|
# ...
end
# If
belongs_to :best_friend_of, serializer: 'FriendSerializer', if: proc { |object, params| '...' }
# Fields
has_one :best_friend, serializer: 'FriendSerializer', fields: [:first_name, :last_name]
# Params
has_one :best_friend, serializer: 'FriendSerializer', params: { static_param: true }
# Entity
has_one :best_friend, serializer: 'FriendSerializer', entity: { description: '...' }
```
### Entity
You can define the entity of your serializer to generate documentation with the option `entity`.
The feature was build to work with [grape-swagger](https://github.com/ruby-grape/grape-swagger).
For more information about defining a model entity see the [Swagger documentation](https://swagger.io/specification/v2/?sbsearch=array%20response#schema-object).
```ruby
class AccountSerializer
include BrightSerializer::Serializer
attribute :id, entity: { type: :string, description: 'The id of the account' }
attribute :name
has_many :friends, serializer: 'FriendSerializer',
entity: {
type: :array, description: 'The list the account friends.'
}
end
```
Callable values are supported.
```ruby
{ entity: { type: :string, enum: -> { SomeModel::ENUMVALUES } } }
```
For relations only `type` need to be defined, `ref` will use the same class has `serializer`.
```ruby
has_many :friends, serializer: 'FriendSerializer', entity: { type: :array }
has_one :best_friend, serializer: 'FriendSerializer', entity: { type: :object }
```
### Instance
If you have defined instance methods inside your serializer you can access them inside block attribute.
```ruby
class AccountSerializer
include BrightSerializer::Serializer
attributes :id, :name
attribute :print do |object|
print_account(object)
end
def print_account(object)
"Account: #{object.name}"
end
end
```
## Development
After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
To install this gem onto your local machine, run `bundle exec rake install`.
## New release
To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).
## Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/petalmd/bright_serializer. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [Contributor Covenant](http://contributor-covenant.org) code of conduct.
## License
The gem is available as open source under the terms of the [MIT License](https://opensource.org/licenses/MIT).