MONGOID-5222 update error message and docs

Author: neilshweky

lib/config/locales/en.yml

@@ -373,9 +373,9 @@ en:
           resolution: "Set the values from the parent, or redefine the association
             with only a single definition in the parent."
         invalid_value:
-          message: "Value of type %{value_class} cannot be written to a field of type %{field_class}"
-          summary: "Tried to set a value of type %{value_class} to a field of type %{field_class}"
-          resolution: "Verify if the value to be set correspond to field definition"
+          message: "The value %{value} cannot be written to a field of type %{field_class}"
+          summary: "The value %{value} could not be coerced to type %{field_class}"
+          resolution: "Verify that the value to be set corresponds to the field definition"
         mixed_relations:
           message: "Referencing a(n) %{embedded} document from the %{root}
             document via a non-embedded association is not allowed since the

lib/mongoid/errors/invalid_value.rb

@@ -7,9 +7,17 @@ module Errors
     # For example when try to set an Array value to a Hash attribute.
     #
     class InvalidValue < MongoidError
-      def initialize(field_class, value_class)
+
+      # Create the new error.
+      #
+      # @param [ Class ] field_class The class of the field attempting to be
+      #   assigned to.
+      # @param [ Object ] value The value being assigned.
+      #
+      # @api private
+      def initialize(field_class, value)
         super(
-          compose_message("invalid_value", { value_class: value_class, field_class: field_class  })
+          compose_message("invalid_value", { value: value, field_class: field_class  })
         )
       end
     end

lib/mongoid/extensions/object.rb

@@ -244,7 +244,7 @@ def _mongoid_wrap_mongoize(object)
           return if object.nil?
           yield.tap do |res|
             if res.nil?
-              raise Errors::InvalidValue.new(self, object.class)
+              raise Errors::InvalidValue.new(self, object)
             end
           end
         end