README.md
# Rosebud
Rails API parameter validation
[![Build Status](https://travis-ci.org/anthonator/rosebud.png?branch=master)](https://travis-ci.org/anthonator/rosebud) [![Coverage Status](https://coveralls.io/repos/anthonator/rosebud/badge.png?branch=master)](https://coveralls.io/r/anthonator/rosebud?branch=master) [![Code Climate](https://codeclimate.com/github/anthonator/rosebud.png)](https://codeclimate.com/github/anthonator/rosebud)
## Installation
Add this line to your application's Gemfile:
gem 'rosebud'
And then execute:
$ bundle
Or install it yourself as:
$ gem install rosebud
## Usage
### Getting Started
Just include ```Rosebud``` in your Rails controller.
```ruby
class Api::V1::SomeController < Api::V1::ApplicationController
include Rosebud
end
```
### Validating Parameters
To validate parameters specify a ```params``` block and choose whether the params are required or optional.
```ruby
class Api::V1::SomeController < Api::V1::ApplicationController
include Rosebud
params do
requires :name
optional :phone_number, regex: /\d{10}/, default: '5555555555'
end
...
end
```
It's also possible to define validations for a specific action.
```ruby
class Api::V1::SomeController < Api::V1::ApplicationController
include Rosebud
params :create do
...
end
def create
...
end
end
```
### Rendering Errors
When a parameter error is raised a JSON response will be rendered.
```ruby
{
"error": "missing_parameter",
"description": "missing parameter: name"
}
```
### Custom Validators
Currently the only validators that ship with Rosebud are ```presence```, ```regex``` and ```type```. If you need other validators you can create your own.
```ruby
class MyLengthValidator < Rosebud::Validator
def validate_param(name, value, options)
if value.length <= options
error!(:length, param: name, length: value.length, max_length: options)
end
end
end
Rosebud::Validations.register_validator!(:length, MyLengthValidator)
```
Rosebud uses the [Errawr::Rails](http://www.github.com/anthonator/errawr-rails) gem to raise and render localised errors. Add your custom error message to your locale file.
```yaml
en:
errawr:
length:
message: %{length} characters is too long for %{param}, should be less than or equal to %{max_length}
http_status: 400
metadata:
additional_info: Kick him in the shins!
```
Add a validation using your custom validator:
```ruby
class Api::V1::SomeController < Api::V1::ApplicationController
include Rosebud
params :create do
requires :name, length: 2
end
def create
...
end
end
```
The following error will be rendered for the ```name``` parameter when provided with a value of ```abc```:
```json
{
"error": "length",
"description": "3 characters is too long for name, should be less than or equal to 2",
"additional_info": "Kick him in the shins!"
}
```
## Contributing
1. Fork it
2. Create your feature branch (`git checkout -b my-new-feature`)
3. Commit your changes (`git commit -am 'Add some feature'`)
4. Push to the branch (`git push origin my-new-feature`)
5. Create new Pull Request
## Credits
[![Sticksnleaves](http://sticksnleaves-wordpress.herokuapp.com/wp-content/themes/sticksnleaves/images/snl-logo-116x116.png)](http://www.sticksnleaves.com)
Rosebud is maintained and funded by [Sticksnleaves](http://www.sticksnleaves.com)
Thanks to all of our [contributors](https://github.com/anthonator/rosebud/graphs/contributors)