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base.rb
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base.rb
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require "rubygems"
require "bundler/setup"
require "active_model"
require "erb"
require "rest-client"
require "json"
require "active_support/hash_with_indifferent_access"
require "parse_resource/query"
require "parse_resource/query_methods"
require "parse_resource/parse_error"
require "parse_resource/parse_exceptions"
module ParseResource
class Base
# ParseResource::Base provides an easy way to use Ruby to interace with a Parse.com backend
# Usage:
# class Post < ParseResource::Base
# fields :title, :author, :body
# end
include ActiveModel::Validations
include ActiveModel::Conversion
include ActiveModel::AttributeMethods
extend ActiveModel::Naming
extend ActiveModel::Callbacks
HashWithIndifferentAccess = ActiveSupport::HashWithIndifferentAccess
define_model_callbacks :save, :create, :update, :destroy
# Instantiates a ParseResource::Base object
#
# @params [Hash], [Boolean] a `Hash` of attributes and a `Boolean` that should be false only if the object already exists
# @return [ParseResource::Base] an object that subclasses `Parseresource::Base`
def initialize(attributes = {}, new=true)
#attributes = HashWithIndifferentAccess.new(attributes)
if new
@unsaved_attributes = attributes
@unsaved_attributes.stringify_keys!
else
@unsaved_attributes = {}
end
self.attributes = {}
self.attributes.merge!(attributes)
self.attributes unless self.attributes.empty?
create_setters_and_getters!
end
# Explicitly adds a field to the model.
#
# @param [Symbol] name the name of the field, eg `:author`.
# @param [Boolean] val the return value of the field. Only use this within the class.
def self.field(fname, val=nil)
fname = fname.to_sym
class_eval do
define_method(fname) do
get_attribute("#{fname}")
end
end
unless self.respond_to? "#{fname}="
class_eval do
define_method("#{fname}=") do |val|
set_attribute("#{fname}", val)
val
end
end
end
end
# Add multiple fields in one line. Same as `#field`, but accepts multiple args.
#
# @param [Array] *args an array of `Symbol`s, `eg :author, :body, :title`.
def self.fields(*args)
args.each {|f| field(f)}
end
# Similar to its ActiveRecord counterpart.
#
# @param [Hash] options Added so that you can specify :class_name => '...'. It does nothing at all, but helps you write self-documenting code.
def self.belongs_to(parent, options = {})
field(parent)
end
def to_pointer
klass_name = self.class.model_name
klass_name = "_User" if klass_name == "User"
{"__type" => "Pointer", "className" => klass_name, "objectId" => self.id}
end
# Creates setter methods for model fields
def create_setters!(k,v)
unless self.respond_to? "#{k}="
self.class.send(:define_method, "#{k}=") do |val|
set_attribute("#{k}", val)
val
end
end
end
def self.method_missing(method_name, *args)
method_name = method_name.to_s
if method_name.start_with?("find_by_")
attrib = method_name.gsub(/^find_by_/,"")
finder_name = "find_all_by_#{attrib}"
define_singleton_method(finder_name) do |target_value|
where({attrib.to_sym => target_value}).first
end
send(finder_name, args[0])
elsif method_name.start_with?("find_all_by_")
attrib = method_name.gsub(/^find_all_by_/,"")
finder_name = "find_all_by_#{attrib}"
define_singleton_method(finder_name) do |target_value|
where({attrib.to_sym => target_value}).all
end
send(finder_name, args[0])
else
super(method_name.to_sym, *args)
end
end
# Creates getter methods for model fields
def create_getters!(k,v)
unless self.respond_to? "#{k}"
self.class.send(:define_method, "#{k}") do
get_attribute("#{k}")
end
end
end
def create_setters_and_getters!
@attributes.each_pair do |k,v|
create_setters!(k,v)
create_getters!(k,v)
end
end
@@settings ||= nil
# Explicitly set Parse.com API keys.
#
# @param [String] app_id the Application ID of your Parse database
# @param [String] master_key the Master Key of your Parse database
def self.load!(app_id, master_key)
@@settings = {"app_id" => app_id, "master_key" => master_key}
end
def self.settings
if @@settings.nil?
path = "config/parse_resource.yml"
#environment = defined?(Rails) && Rails.respond_to?(:env) ? Rails.env : ENV["RACK_ENV"]
environment = ENV["RACK_ENV"]
@@settings = YAML.load(ERB.new(File.new(path).read).result)[environment]
end
@@settings
end
# Creates a RESTful resource
# sends requests to [base_uri]/[classname]
#
def self.resource
if @@settings.nil?
path = "config/parse_resource.yml"
environment = defined?(Rails) && Rails.respond_to?(:env) ? Rails.env : ENV["RACK_ENV"]
@@settings = YAML.load(ERB.new(File.new(path).read).result)[environment]
end
if model_name == "User" #https://parse.com/docs/rest#users-signup
base_uri = "https://api.parse.com/1/users"
else
base_uri = "https://api.parse.com/1/classes/#{model_name}"
end
#refactor to settings['app_id'] etc
app_id = @@settings['app_id']
master_key = @@settings['master_key']
RestClient::Resource.new(base_uri, app_id, master_key)
end
# Creates a RESTful resource for file uploads
# sends requests to [base_uri]/files
#
def self.upload(file_instance, filename, options={})
if @@settings.nil?
path = "config/parse_resource.yml"
environment = defined?(Rails) && Rails.respond_to?(:env) ? Rails.env : ENV["RACK_ENV"]
@@settings = YAML.load(ERB.new(File.new(path).read).result)[environment]
end
base_uri = "https://api.parse.com/1/files"
#refactor to settings['app_id'] etc
app_id = @@settings['app_id']
master_key = @@settings['master_key']
options[:content_type] ||= 'image/jpg' # TODO: Guess mime type here.
file_instance = File.new(file_instance, 'rb') if file_instance.is_a? String
filename = filename.parameterize
private_resource = RestClient::Resource.new "#{base_uri}/#{filename}", app_id, master_key
private_resource.post(file_instance, options) do |resp, req, res, &block|
return false if resp.code == 400
return JSON.parse(resp) rescue {"code" => 0, "error" => "unknown error"}
end
false
end
# Find a ParseResource::Base object by ID
#
# @param [String] id the ID of the Parse object you want to find.
# @return [ParseResource] an object that subclasses ParseResource.
def self.find(id)
raise RecordNotFound if id.blank?
where(:objectId => id).first
end
# Find a ParseResource::Base object by chaining #where method calls.
#
def self.where(*args)
Query.new(self).where(*args)
end
include ParseResource::QueryMethods
# Create a ParseResource::Base object.
#
# @param [Hash] attributes a `Hash` of attributes
# @return [ParseResource] an object that subclasses `ParseResource`. Or returns `false` if object fails to save.
def self.create(attributes = {})
attributes = HashWithIndifferentAccess.new(attributes)
obj = new(attributes)
obj.save
obj # This won't return true/false it will return object or nil...
end
def self.destroy_all
all.each do |object|
object.destroy
end
end
def self.class_attributes
@class_attributes ||= {}
end
def persisted?
if id
true
else
false
end
end
def new?
!persisted?
end
# delegate from Class method
def resource
self.class.resource
end
# create RESTful resource for the specific Parse object
# sends requests to [base_uri]/[classname]/[objectId]
def instance_resource
self.class.resource["#{self.id}"]
end
def create
opts = {:content_type => "application/json"}
attrs = @unsaved_attributes.to_json
result = self.resource.post(attrs, opts) do |resp, req, res, &block|
if resp.code.to_s == "200" || resp.code.to_s == "201"
@attributes.merge!(JSON.parse(resp))
@attributes.merge!(@unsaved_attributes)
attributes = HashWithIndifferentAccess.new(attributes)
@unsaved_attributes = {}
create_setters_and_getters!
return true
else
error_response = JSON.parse(resp)
pe = ParseError.new(resp.code.to_s).to_array
self.errors.add(pe[0], pe[1])
return false
end
end
end
def save
if valid?
run_callbacks :save do
if new?
return create
else
return update
end
end
else
false
end
rescue false
end
def update(attributes = {})
attributes = HashWithIndifferentAccess.new(attributes)
@unsaved_attributes.merge!(attributes)
put_attrs = @unsaved_attributes
put_attrs.delete('objectId')
put_attrs.delete('createdAt')
put_attrs.delete('updatedAt')
put_attrs = put_attrs.to_json
opts = {:content_type => "application/json"}
result = self.instance_resource.put(put_attrs, opts) do |resp, req, res, &block|
if resp.code.to_s == "200" || resp.code.to_s == "201"
@attributes.merge!(JSON.parse(resp))
@attributes.merge!(@unsaved_attributes)
@unsaved_attributes = {}
create_setters_and_getters!
return true
else
error_response = JSON.parse(resp)
pe = ParseError.new(resp.code.to_s, error_response["error"]).to_array
self.errors.add(pe[0], pe[1])
return false
end
end
end
def update_attributes(attributes = {})
self.update(attributes)
end
def destroy
if self.instance_resource.delete
@attributes = {}
@unsaved_attributes = {}
return true
end
false
end
def reload
return false if new?
fresh_object = self.class.find(id)
@attributes.update(fresh_object.instance_variable_get('@attributes'))
@unsaved_attributes = {}
self
end
# provides access to @attributes for getting and setting
def attributes
@attributes ||= self.class.class_attributes
@attributes
end
# AKN 2012-06-18: Shouldn't this also be setting @unsaved_attributes?
def attributes=(n)
@attributes = n
@attributes
end
def get_attribute(k)
attrs = @unsaved_attributes[k.to_s] ? @unsaved_attributes : @attributes
case attrs[k]
when Hash
klass_name = attrs[k]["className"]
klass_name = "User" if klass_name == "_User"
case attrs[k]["__type"]
when "Pointer"
result = klass_name.constantize.find(attrs[k]["objectId"])
when "Object"
result = klass_name.constantize.new(attrs[k], false)
when "Date"
result = DateTime.parse(attrs[k]["iso"])
when "File"
result = attrs[k]["url"]
end #todo: support other types https://www.parse.com/docs/rest#objects-types
else
result = attrs["#{k}"]
end
result
end
def set_attribute(k, v)
if v.is_a?(Date) || v.is_a?(Time) || v.is_a?(DateTime)
v = {"__type" => "Date", "iso" => v.iso8601}
else
v = v.to_pointer if v.respond_to?(:to_pointer)
end
@unsaved_attributes[k.to_s] = v unless v == @attributes[k.to_s] # || @unsaved_attributes[k.to_s]
@attributes[k.to_s] = v
v
end
# aliasing for idiomatic Ruby
def id; get_attribute("objectId") rescue nil; end
def objectId; get_attribute("objectId") rescue nil; end
def created_at; self.createdAt; end
def updated_at; self.updatedAt rescue nil; end
def self.included(base)
base.extend(ClassMethods)
end
module ClassMethods
end
end
end