1 files changed, 39 insertions, 0 deletions
diff --git a/lib/activeattr_ext.rb b/lib/activeattr_ext.rb
new file mode 100644
index 000000000..b4c112b72
--- /dev/null
+++ b/lib/activeattr_ext.rb
@@ -0,0 +1,39 @@
+module ActiveAttr::MultiParameterAttributes
+
+  def assign_attributes(new_attributes, options = {})
+    super(
+      expand_multiparameter_attributes(new_attributes),
+      options
+    )
+  end
+
+  def expand_multiparameter_attributes(attributes)
+    attributes ||= {}
+
+    single_parameter_attributes = {}
+    multi_parameter_attributes = {}
+
+    attributes.each do |key, value|
+      matches = key.match(/^(?<key>[^\(]+)\((?<index>\d+)i\)$/)
+
+      unless matches
+        single_parameter_attributes[key] = value
+        next
+      end
+
+      args = (multi_parameter_attributes[matches['key']] ||= [])
+      args[matches['index'].to_i - 1] = (value.present? ? value.to_i : nil)
+    end
+
+    single_parameter_attributes.merge(
+      multi_parameter_attributes.inject({}) do |hash, (key, args)|
+        if args.all?(&:present?)
+          hash.merge(key => _attribute_type(key).new(*args))
+        else
+          hash
+        end
+      end
+    )
+  end
+
+end