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Sample code from my Using OO to Manage Control Flow post
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class Credential | |
include ActiveModel::Validations | |
attr_accessor :screen_name, :oauth_token, :oauth_secret, :token, :description | |
validates_presence_of :screen_name, :oauth_token, :oauth_secret, :message => 'required' | |
validate :user_exists, :unless => :errors? | |
def initialize(attributes = {}) | |
attributes.each {|k, v| set_recognized_attribute(k, v) } | |
end | |
def save | |
valid? && create_device | |
end | |
def as_json(options = {}) | |
{:api_key => @device.api_key} | |
end | |
private | |
def errors? | |
errors.any? | |
end | |
def set_recognized_attribute(name, value) | |
setter_method = "#{name}=" | |
self.send(setter_method, value) if respond_to?(setter_method) | |
end | |
def user | |
@user ||= User.by_screen_name(screen_name).where({ | |
:oauth_token => oauth_token, | |
:oauth_secret => oauth_secret | |
}).first | |
end | |
def create_device | |
@device = Device.find_or_create_by_token!({ | |
:token => token, | |
:description => description, | |
:user_id => user.id | |
}) | |
!@device.nil? | |
end | |
def user_exists | |
errors.add(:user, 'not found') unless user.present? | |
end | |
end |
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class CredentialsController < ApplicationController | |
def create | |
credential = Credential.new(params) | |
if credential.save | |
render :json => credential | |
else | |
render :json => {:error => errors_for(credential)}, :status => :unprocessable_entity | |
end | |
end | |
private | |
def errors_for(object) | |
object.errors.map {|k, m| "#{k} #{m}" } | |
end | |
end |
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