Fix server based errors and unique error field name issue.

app/volt/tasks/store_tasks.rb

@@ -55,6 +55,9 @@ def save(collection, path, data)
       save_promise = model.save!.then do |result|
 
         next nil
+      end.fail do |err|
+        # An error object, convert to hash
+        Promise.new.reject(err.to_h)
       end
 
       Thread.current['in_channel'] = nil

lib/volt/models/buffer.rb

@@ -42,6 +42,9 @@ def save!(&block)
             end.fail do |errors|
               if errors.is_a?(Hash)
                 server_errors.replace(errors)
+
+                # Merge the server errors into the main errors
+                self.errors.merge!(server_errors.to_h)
               end
 
               promise_for_errors(errors)

lib/volt/models/validations.rb

@@ -20,7 +20,8 @@ def validate(field_name = nil, options = nil, &block)
           custom_validations << block
         else
           self.validations             ||= {}
-          validations[field_name] = options
+          validations[field_name]      ||= {}
+          validations[field_name].merge!(options)
         end
       end
     end

lib/volt/models/validators/unique_validator.rb

@@ -17,7 +17,7 @@ def self.validate(model, field_name, args)
               message = (args.is_a?(Hash) && args[:message]) || 'is already taken'
 
               # return the error
-              next {field_name: [message]}
+              next {field_name => [message]}
             end
           end
         end

lib/volt/page/tasks.rb

@@ -46,7 +46,7 @@ def response(promise_id, result, error)
         if error
           # TODO: full error handling
           Volt.logger.error("Task Response:")
-          Volt.logger.error(error)
+          Volt.logger.error(error.inspect)
           promise.reject(error)
         else
           promise.resolve(result)