Allow per Resource format settings

Previously, ActiveResource was using the connection level formatter for get requests. This made it impossible to use custom formatters per resource.

Additionally this commit makes the Connection request methods more consistent. It always returns a Response. The base will then decode it each the response using its format setting.

Merging this commit will allow users to add custom formatters on a per Resource basis. This enables handling pagination responses from the server side, a very common use case that was previously impossible without monkeypatching XmlFormat.
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

activeresource/lib/active_resource/base.rb

@@ -678,7 +678,7 @@ def collection_path(prefix_options = {}, query_options = nil)
       # Returns the new resource instance.
       #
       def build(attributes = {})
-        attrs = connection.get("#{new_element_path}").merge(attributes)
+        attrs = self.format.decode(connection.get("#{new_element_path}").body).merge(attributes)
         self.new(attrs)
       end
 
@@ -850,11 +850,11 @@ def find_every(options)
               instantiate_collection(get(from, options[:params]))
             when String
               path = "#{from}#{query_string(options[:params])}"
-              instantiate_collection(connection.get(path, headers) || [])
+              instantiate_collection(format.decode(connection.get(path, headers).body) || [])
             else
               prefix_options, query_options = split_options(options[:params])
               path = collection_path(prefix_options, query_options)
-              instantiate_collection( (connection.get(path, headers) || []), prefix_options )
+              instantiate_collection( (format.decode(connection.get(path, headers).body) || []), prefix_options )
             end
           rescue ActiveResource::ResourceNotFound
             # Swallowing ResourceNotFound exceptions and return nil - as per
@@ -870,7 +870,7 @@ def find_one(options)
             instantiate_record(get(from, options[:params]))
           when String
             path = "#{from}#{query_string(options[:params])}"
-            instantiate_record(connection.get(path, headers))
+            instantiate_record(format.decode(connection.get(path, headers).body))
           end
         end
 
@@ -878,7 +878,7 @@ def find_one(options)
         def find_single(scope, options)
           prefix_options, query_options = split_options(options[:params])
           path = element_path(scope, prefix_options, query_options)
-          instantiate_record(connection.get(path, headers), prefix_options)
+          instantiate_record(format.decode(connection.get(path, headers).body), prefix_options)
         end
 
         def instantiate_collection(collection, prefix_options = {})

activeresource/lib/active_resource/connection.rb

@@ -76,7 +76,7 @@ def ssl_options=(opts={})
     # Executes a GET request.
     # Used to get (find) resources.
     def get(path, headers = {})
-      with_auth { format.decode(request(:get, path, build_request_headers(headers, :get, self.site.merge(path))).body) }
+      with_auth { request(:get, path, build_request_headers(headers, :get, self.site.merge(path))) }
     end
 
     # Executes a DELETE request (see HTTP protocol documentation if unfamiliar).

activeresource/lib/active_resource/custom_methods.rb

@@ -54,7 +54,7 @@ class << self
         #
         #   Person.find(:all, :from => :active)
         def get(custom_method_name, options = {})
-          connection.get(custom_method_collection_url(custom_method_name, options), headers)
+          format.decode(connection.get(custom_method_collection_url(custom_method_name, options), headers).body)
         end
 
         def post(custom_method_name, options = {}, body = '')
@@ -85,7 +85,7 @@ def custom_method_collection_url(method_name, options = {})
 
     module InstanceMethods
       def get(method_name, options = {})
-        connection.get(custom_method_element_url(method_name, options), self.class.headers)
+        self.class.format.decode(connection.get(custom_method_element_url(method_name, options), self.class.headers).body)
       end
 
       def post(method_name, options = {}, body = nil)

activeresource/test/cases/authorization_test.rb

@@ -132,7 +132,7 @@ def test_authorization_header_if_credentials_supplied_and_auth_type_is_digest
   end
 
   def test_get
-    david = @authenticated_conn.get("/people/2.xml")
+    david = decode(@authenticated_conn.get("/people/2.xml"))
     assert_equal "David", david["name"]
   end
 
@@ -159,7 +159,7 @@ def test_head
   def test_get_with_digest_auth_handles_initial_401_response_and_retries
     @authenticated_conn.auth_type = :digest
     response = @authenticated_conn.get("/people/2.xml")
-    assert_equal "David", response["name"]
+    assert_equal "David", decode(response)["name"]
   end
 
   def test_post_with_digest_auth_handles_initial_401_response_and_retries
@@ -190,11 +190,11 @@ def test_head_with_digest_auth_handles_initial_401_response_and_retries
   def test_get_with_digest_auth_caches_nonce
     @authenticated_conn.auth_type = :digest
     response = @authenticated_conn.get("/people/2.xml")
-    assert_equal "David", response["name"]
+    assert_equal "David", decode(response)["name"]
 
     # There is no mock for this request with a non-cached nonce.
     response = @authenticated_conn.get("/people/1.xml")
-    assert_equal "Matz", response["name"]
+    assert_equal "Matz", decode(response)["name"]
   end
 
   def test_retry_on_401_only_happens_with_digest_auth
@@ -241,4 +241,8 @@ def request_digest_auth_header(uri, response)
     def response_digest_auth_header
       %Q(Digest realm="RailsTestApp", qop="auth", algorithm=MD5, nonce="#{@nonce}", opaque="ef6dfb078ba22298d366f99567814ffb")
     end
+
+    def decode(response)
+      @authenticated_conn.format.decode(response.body)
+    end
 end

activeresource/test/connection_test.rb

@@ -120,7 +120,7 @@ def test_timeout_accessor
   end
 
   def test_get
-    matz = @conn.get("/people/1.xml")
+    matz = decode(@conn.get("/people/1.xml"))
     assert_equal "Matz", matz["name"]
   end
 
@@ -131,23 +131,23 @@ def test_head
   end
 
   def test_get_with_header
-    david = @conn.get("/people/2.xml", @header)
+    david = decode(@conn.get("/people/2.xml", @header))
     assert_equal "David", david["name"]
   end
 
   def test_get_collection
-    people = @conn.get("/people.xml")
+    people = decode(@conn.get("/people.xml"))
     assert_equal "Matz", people[0]["name"]
     assert_equal "David", people[1]["name"]
   end
 
   def test_get_collection_single
-    people = @conn.get("/people_single_elements.xml")
+    people = decode(@conn.get("/people_single_elements.xml"))
     assert_equal "Matz", people[0]["name"]
   end
 
   def test_get_collection_empty
-    people = @conn.get("/people_empty_elements.xml")
+    people = decode(@conn.get("/people_empty_elements.xml"))
     assert_equal [], people
   end
 
@@ -250,4 +250,8 @@ def assert_response_raises(klass, code)
     def handle_response(response)
       @conn.__send__(:handle_response, response)
     end
+
+    def decode(response)
+      @conn.format.decode(response.body)
+    end
 end