add dynamic setter for empty fields

lib/contentful_model/base.rb

@@ -58,20 +58,32 @@ def nillable?(name, value)
         self.class.return_nil_for_empty_attribute_fields.include?(name)
     end
 
+    def field_getter(name)
+      result = filter_invalids(
+        self.class.coerce_value(name, fields[name])
+      )
+
+      return nil if nillable?(name, result)
+
+      result
+    end
+
     def define_fields_methods
       fields.keys.each do |name|
         define_singleton_method name do
-          result = filter_invalids(
-            self.class.coerce_value(name, fields[name])
-          )
-
-          return nil if nillable?(name, result)
-
-          result
+          field_getter(name)
         end
       end
     end
 
+    def method_missing(name, *args, &block)
+      if content_type_field?(name) && fields.key?(name)
+        field_getter(name)
+      else
+        super
+      end
+    end
+
     def override_getters
       define_sys_methods
       define_fields_methods

lib/contentful_model/manageable.rb

@@ -106,11 +106,31 @@ def define_setters
       end
     end
 
+    def field_setter(name, value)
+      @dirty = true
+      @changed_fields << name
+      fields[name] = value
+    end
+
     def define_setter(name)
       define_singleton_method "#{name.to_s.underscore}=" do |value|
-        @dirty = true
-        @changed_fields << name
-        fields[name] = value
+        field_setter(name, value)
+      end
+    end
+
+    def method_missing(name, *args, &block)
+      if (matches = name.match(/^(?<field>.*)=$/)) && content_type_field?(matches[:field].to_sym)
+        field_setter(matches[:field].to_sym, args[0])
+      else
+        super
+      end
+    end
+
+    def respond_to_missing?(name, include_private = false)
+      if matches = name.match(/^(?<field>.*)=$/)
+        content_type_field?(matches[:field].to_sym) || super
+      else
+        super
       end
     end