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require 'active_resource/connection'
module ActiveResource
class Base
# The logger for logging diagnostic and trace information during ARes
# calls.
cattr_accessor :logger
class << self
attr_reader :site
def site=(site)
@site = site.is_a?(URI) ? site : URI.parse(site)
@connection = nil
@site
end
def connection(refresh = false)
@connection = Connection.new(site) if refresh || @connection.nil?
@connection
end
attr_accessor_with_default(:element_name) { to_s.underscore }
attr_accessor_with_default(:collection_name) { element_name.pluralize }
attr_accessor_with_default(:primary_key, 'id')
def prefix(options={})
default = site.path
default << '/' unless default[-1..-1] == '/'
self.prefix = default
prefix(options)
end
def prefix=(value = '/')
prefix_call = value.gsub(/:\w+/) { |s| "\#{options[#{s}]}" }
method_decl = %(def self.prefix(options={}) "#{prefix_call}" end)
eval method_decl
end
alias_method :set_prefix, :prefix=
alias_method :set_element_name, :element_name=
alias_method :set_collection_name, :collection_name=
def element_path(id, options = {})
"#{prefix(options)}#{collection_name}/#{id}.xml"
end
def collection_path(options = {})
"#{prefix(options)}#{collection_name}.xml"
end
alias_method :set_primary_key, :primary_key=
# Person.find(1) # => GET /people/1.xml
# StreetAddress.find(1, :person_id => 1) # => GET /people/1/street_addresses/1.xml
def find(*arguments)
scope = arguments.slice!(0)
options = arguments.slice!(0) || {}
case scope
when :all then find_every(options)
when :first then find_every(options).first
else find_single(scope, options)
end
end
def delete(id)
connection.delete(element_path(id))
end
private
# { :people => { :person => [ person1, person2 ] } }
def find_every(options)
connection.get(collection_path(options)).values.first.values.first.collect { |element| new(element, options) }
end
# { :person => person1 }
def find_single(scope, options)
new(connection.get(element_path(scope, options)).values.first, options)
end
end
attr_accessor :attributes
attr_accessor :prefix_options
def initialize(attributes = {}, prefix_options = {})
@attributes = {}
self.load attributes
@prefix_options = prefix_options
end
def new?
id.nil?
end
def id
attributes[self.class.primary_key]
end
def id=(id)
attributes[self.class.primary_key] = id
end
def save
new? ? create : update
end
def destroy
connection.delete(self.class.element_path(id, prefix_options))
end
def to_xml(options={})
attributes.to_xml({:root => self.class.element_name}.merge(options))
end
# Reloads the attributes of this object from the remote web service.
def reload
self.load self.class.find(id, @prefix_options).attributes
end
# Manually load attributes from a hash. Recursively loads collections of
# resources.
def load(attributes)
raise ArgumentError, "expected an attributes Hash, got #{attributes.inspect}" unless attributes.is_a?(Hash)
attributes.each do |key, value|
@attributes[key.to_s] =
case value
when Array
resource = find_or_create_resource_for_collection(key)
value.map { |attrs| resource.new(attrs) }
when Hash
# Workaround collections loaded as Hash
# :persons => { :person => [
# { :id => 1, :name => 'a' },
# { :id => 2, :name => 'b' } ]}
if value.keys.size == 1 and value.values.first.is_a?(Array)
resource = find_or_create_resource_for(value.keys.first)
value.values.first.map { |attrs| resource.new(attrs) }
else
resource = find_or_create_resource_for(key)
resource.new(value)
end
when ActiveResource::Base
value.class.new(value.attributes)
else
value.dup rescue value
end
end
self
end
protected
def connection(refresh = false)
self.class.connection(refresh)
end
def update
connection.put(self.class.element_path(id, prefix_options), to_xml)
true
end
def create
resp = connection.post(self.class.collection_path(prefix_options), to_xml)
self.id = id_from_response(resp)
true
end
# takes a response from a typical create post and pulls the ID out
def id_from_response(response)
response['Location'][/\/([^\/]*?)(\.\w+)?$/, 1]
end
private
def find_or_create_resource_for_collection(name)
find_or_create_resource_for(name.to_s.singularize)
end
def find_or_create_resource_for(name)
resource_name = name.to_s.camelize
resource_name.constantize
rescue NameError
resource = self.class.const_set(resource_name, Class.new(ActiveResource::Base))
resource.prefix = self.class.prefix
resource.site = self.class.site
resource
end
def method_missing(method_symbol, *arguments)
method_name = method_symbol.to_s
case method_name.last
when "="
attributes[method_name.first(-1)] = arguments.first
when "?"
attributes[method_name.first(-1)] == true
else
attributes.has_key?(method_name) ? attributes[method_name] : super
end
end
end
end
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