1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
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
def element_name
self.to_s.underscore
end
def collection_name
element_name.pluralize
end
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=
def element_name=(value)
class << self ; attr_reader :element_name ; end
@element_name = value
end
alias_method :set_element_name, :element_name=
def collection_name=(value)
class << self ; attr_reader :collection_name ; end
@collection_name = value
end
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
def primary_key
self.primary_key = 'id'
end
def primary_key=(value)
class << self ; attr_reader :primary_key ; end
@primary_key = value
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
|