WIP on Mongoid raw value for mongoize/demongoize

Author: johnnyshields

lib/mongoid/attributes.rb

@@ -170,6 +170,8 @@ def write_attribute(name, value)
 
       if attribute_writable?(field_name)
         _assigning do
+          # TODO: remove this
+          # validate_attribute_value(field_name, value)
           localized = fields[field_name].try(:localized?)
           attributes_before_type_cast[name.to_s] = value
           typed_value = typed_value_for(field_name, value)
@@ -358,6 +360,31 @@ def unalias_attribute(name)
 
     private
 
+    # Validates an attribute value as being assignable to the specified field.
+    #
+    # For now, only Hash and Array fields are validated, and the value is
+    # being checked to be of an appropriate type (i.e. either Hash or Array,
+    # respectively, or nil).
+    #
+    # This method takes the name of the field as stored in the document
+    # in the database, not (necessarily) the Ruby method name used to read/write
+    # the said field.
+    #
+    # @param [ String, Symbol ] field_name The name of the field.
+    # @param [ Object ] value The value to be validated.
+    # TODO: remove this
+    # def validate_attribute_value(field_name, value)
+    #   return if value.nil?
+    #   field = fields[field_name]
+    #   return unless field
+    #   validatable_types = [ Hash, Array ]
+    #   if validatable_types.include?(field.type)
+    #     unless value.is_a?(field.type)
+    #       raise Mongoid::Errors::InvalidValue.new(field.type, value.class)
+    #     end
+    #   end
+    # end
+
     def lookup_attribute_presence(name, value)
       if localized_fields.has_key?(name) && value
         value = localized_fields[name].send(:lookup, value)

lib/mongoid/config.rb

@@ -71,6 +71,14 @@ module Config
     # existing method.
     option :scope_overwrite_exception, default: false
 
+    # Indicates whether or not to raise an error when attempting
+    # to assign an incompatible type to a field.
+    option :strict_type_assignment, default: false
+
+    # Indicates whether uncastable values from the database should
+    # be returned wrapped by Mongoid::RawValue class.
+    option :wrap_uncastable_values_from_database, default: false
+
     # Use ActiveSupport's time zone in time operations instead of the
     # Ruby default time zone.
     option :use_activesupport_time_zone, default: true

lib/mongoid/criteria/queryable/extensions/array.rb

@@ -137,7 +137,7 @@ def evolve(object)
               when ::Array, ::Set
                 object.map { |obj| obj.class.evolve(obj) }
               else
-                object
+                Mongoid::RawValue(object, 'Array')
               end
             end
           end

lib/mongoid/criteria/queryable/selector.rb

@@ -150,18 +150,24 @@ def evolve_multi(specs)
         #
         # @return [ Object ] The serialized object.
         def evolve(serializer, value)
-          case value
-          when Mongoid::RawValue
-            value.raw_value
-          when Hash
-            evolve_hash(serializer, value)
-          when Array
-            evolve_array(serializer, value)
-          when Range
-            value.__evolve_range__(serializer: serializer)
-          else
-            (serializer || value.class).evolve(value)
+          _value = case value
+                   when Mongoid::RawValue
+                     value.raw_value
+                   when Hash
+                     evolve_hash(serializer, value)
+                   when Array
+                     evolve_array(serializer, value)
+                   when Range
+                     value.__evolve_range__(serializer: serializer)
+                   else
+                     (serializer || value.class).evolve(value)
+                   end
+
+          while _value.is_a?(Mongoid::RawValue) do
+            _value = _value.raw_value
           end
+
+          _value
         end
 
         # Evolve a single key selection with array values.

lib/mongoid/extensions/array.rb

@@ -150,6 +150,8 @@ def mongoize(object)
           case object
           when ::Array, ::Set
             object.map(&:mongoize)
+          else
+            Mongoid::RawValue(object, 'Array')
           end
         end
 

lib/mongoid/extensions/big_decimal.rb

@@ -70,14 +70,18 @@ def mongoize(object)
               BSON::Decimal128.new(object)
             elsif object.numeric?
               BSON::Decimal128.new(object.to_s)
-            elsif !object.is_a?(String)
-              object.try(:to_d)
+            elsif !object.is_a?(String) && object.respond_to?(:to_d)
+              object.to_d
+            else
+              Mongoid::RawValue(object, 'BigDecimal')
             end
           else
             if object.is_a?(BSON::Decimal128) || object.numeric?
               object.to_s
-            elsif !object.is_a?(String)
-              object.try(:to_d)&.to_s
+            elsif !object.is_a?(String) && object.respond_to?(:to_d)
+              object.to_d
+            else
+              Mongoid::RawValue(object, 'BigDecimal')
             end
           end
         end

lib/mongoid/extensions/binary.rb

@@ -30,6 +30,7 @@ def mongoize(object)
           case object
           when BSON::Binary then object
           when String, Symbol then BSON::Binary.new(object.to_s)
+          else Mongoid::RawValue(object, 'BSON::Binary')
           end
         end
         alias :demongoize :mongoize

lib/mongoid/extensions/boolean.rb

@@ -18,6 +18,8 @@ def mongoize(object)
           true
         elsif object.to_s =~ (/\A(false|f|no|n|off|0|0.0)\z/i)
           false
+        else
+          Mongoid::RawValue(object, 'Boolean')
         end
       end
       alias :demongoize :mongoize

lib/mongoid/extensions/date.rb

@@ -71,12 +71,13 @@ def mongoize(object)
             else
               time = object.__mongoize_time__
             end
+
+            if time.acts_like?(:time)
+              return ::Time.utc(time.year, time.month, time.day)
+            end
           rescue ArgumentError
-            nil
-          end
-          if time.acts_like?(:time)
-            ::Time.utc(time.year, time.month, time.day)
           end
+          Mongoid::RawValue(object, 'Date')
         end
       end
     end

lib/mongoid/extensions/float.rb

@@ -41,8 +41,10 @@ def mongoize(object)
             if object.numeric?
               object.to_f
             end
+          elsif object.respond_to?(:to_f)
+            object.to_f
           else
-            object.try(:to_f)
+            Mongoid::RawValue(object, 'Float')
           end
         end
         alias :demongoize :mongoize

lib/mongoid/extensions/hash.rb

@@ -225,6 +225,8 @@ def mongoize(object)
             object.dup.transform_values!(&:mongoize)
           when Hash
             BSON::Document.new(object.transform_values(&:mongoize))
+          else
+            Mongoid::RawValue(object, 'Hash')
           end
         end
 

lib/mongoid/extensions/integer.rb

@@ -49,8 +49,10 @@ def mongoize(object)
             if object.numeric?
               object.to_i
             end
+          elsif object.respond_to?(:to_i)
+            object.to_i
           else
-            object.try(:to_i)
+            Mongoid::RawValue(object, 'Integer')
           end
         end
         alias :demongoize :mongoize

lib/mongoid/extensions/range.rb

@@ -77,6 +77,7 @@ def mongoize(object)
           case object
           when Hash then __mongoize_hash__(object)
           when Range then __mongoize_range__(object)
+          else Mongoid::RawValue(object, 'Range')
           end
         end
 

lib/mongoid/extensions/raw_value.rb

@@ -1,24 +1,42 @@
 # frozen_string_literal: true
 
-# Wrapper class used when a value cannot be casted in evolve method.
+# Wrapper class used when a value cannot be casted by the
+# mongoize, demongoize, and evolve methods.
 module Mongoid
 
-  # Instantiates a new Mongoid::RawValue object. Used as a syntax shortcut.
+  # Instantiates a new Mongoid::RawValue object. Used as a
+  # syntax shortcut.
   #
   # @example Create a Mongoid::RawValue object.
   #   Mongoid::RawValue("Beagle")
   #
+  # @param [ Object ] raw_value The underlying raw object.
+  # @param [ String ] cast_class_name The name of the class
+  #   to which the raw value is intended to be cast.
+  #
   # @return [ Mongoid::RawValue ] The object.
-  def RawValue(*args)
-    RawValue.new(*args)
+  def RawValue(raw_value, cast_class_name = nil)
+    RawValue.new(raw_value, cast_class_name)
   end
 
   class RawValue
 
-    attr_reader :raw_value
+    attr_reader :raw_value,
+                :cast_class_name
 
-    def initialize(raw_value)
+    # Instantiates a new Mongoid::RawValue object.
+    #
+    # @example Create a Mongoid::RawValue object.
+    #   Mongoid::RawValue.new("Beagle", "String")
+    #
+    # @param [ Object ] raw_value The underlying raw object.
+    # @param [ String ] cast_class_name The name of the class
+    #   to which the raw value is intended to be cast.
+    #
+    # @return [ Mongoid::RawValue ] The object.
+    def initialize(raw_value, cast_class_name = nil)
       @raw_value = raw_value
+      @cast_class_name = cast_class_name
     end
 
     # Returns a string containing a human-readable representation of
@@ -28,5 +46,35 @@ def initialize(raw_value)
     def inspect
       "RawValue: #{raw_value.inspect}"
     end
+
+    # Raises a Mongoid::Errors::InvalidValue error.
+    def raise_error!
+      raise Mongoid::Errors::InvalidValue.new(raw_value.class.name, cast_class_name)
+    end
+
+    # Logs a warning that a value cannot be cast.
+    def warn
+      Mongoid.logger.warn("Cannot cast #{raw_value.class.name} to #{cast_class_name}; returning nil")
+    end
+
+    # Delegate all missing methods to the raw value.
+    #
+    # @param [ String, Symbol ] method_name The name of the method.
+    # @param [ Array ] args The arguments passed to the method.
+    #
+    # @return [ Object ] The method response.
+    ruby2_keywords def method_missing(method_name, *args, &block)
+      raw_value.send(method_name, *args, &block)
+    end
+
+    # Delegate all missing methods to the raw value.
+    #
+    # @param [ String, Symbol ] method_name The name of the method.
+    # @param [ true | false ] include_private Whether to check private methods.
+    #
+    # @return [ true | false ] Whether the raw value object responds to the method.
+    def respond_to_missing?(method_name, include_private = false)
+      raw_value.respond_to?(method_name, include_private)
+    end
   end
 end

lib/mongoid/extensions/regexp.rb

@@ -17,13 +17,16 @@ module ClassMethods
         # @return [ Regexp | nil ] The object mongoized or nil.
         def mongoize(object)
           return if object.nil?
-          case object
-          when String then ::Regexp.new(object)
-          when ::Regexp then object
-          when BSON::Regexp::Raw then object.compile
+          begin
+            _object = case object
+                      when String then ::Regexp.new(object)
+                      when ::Regexp then object
+                      when BSON::Regexp::Raw then object.compile
+                      end
+            return _object if _object
+          rescue RegexpError
           end
-        rescue RegexpError
-          nil
+          Mongoid::RawValue(object, 'Regexp')
         end
         alias :demongoize :mongoize
       end

lib/mongoid/extensions/set.rb

@@ -46,6 +46,7 @@ def mongoize(object)
           case object
           when ::Set then ::Array.mongoize(object.to_a).uniq
           when ::Array then ::Array.mongoize(object).uniq
+          else Mongoid::RawValue(object, 'Set')
           end
         end
       end

lib/mongoid/extensions/string.rb

@@ -159,7 +159,9 @@ module ClassMethods
         #
         # @return [ String ] The object mongoized.
         def mongoize(object)
-          object.try(:to_s)
+          return if object.nil?
+          return object.to_s if object.respond_to?(:to_s)
+          Mongoid::RawValue.new(object, 'String')
         end
         alias :demongoize :mongoize
       end

lib/mongoid/extensions/symbol.rb

@@ -26,7 +26,9 @@ module ClassMethods
         #
         # @return [ Symbol | nil ] The object mongoized or nil.
         def mongoize(object)
-          object.try(:to_sym)
+          return if object.nil?
+          return object.to_sym if object.respond_to?(:to_sym)
+          Mongoid::RawValue.new(object, 'Symbol')
         end
         alias :demongoize :mongoize
       end

lib/mongoid/extensions/time.rb

@@ -84,19 +84,18 @@ def mongoize(object)
           return if object.blank?
           begin
             time = object.__mongoize_time__
-          rescue ArgumentError
-            return
-          end
-
-          if time.acts_like?(:time)
-            if object.respond_to?(:sec_fraction)
-              ::Time.at(time.to_i, object.sec_fraction * 10**6).utc
-            elsif time.respond_to?(:subsec)
-              ::Time.at(time.to_i, time.subsec * 10**6).utc
-            else
-              ::Time.at(time.to_i, time.usec).utc
+            if time.acts_like?(:time)
+              if object.respond_to?(:sec_fraction)
+                return ::Time.at(time.to_i, object.sec_fraction * 10**6).utc
+              elsif time.respond_to?(:subsec)
+                return ::Time.at(time.to_i, time.subsec * 10**6).utc
+              else
+                return ::Time.at(time.to_i, time.usec).utc
+              end
             end
+          rescue ArgumentError
           end
+          Mongoid::RawValue.new(object, 'Time')
         end
       end
     end

lib/mongoid/fields/localized.rb

@@ -50,7 +50,7 @@ def localize_present?
       #
       # @return [ Hash ] The locale with string translation.
       def mongoize(object)
-        { ::I18n.locale.to_s => type.mongoize(object) }
+        { ::I18n.locale.to_s => super(object) }
       end
 
       private