Read message value directly from options

**Why**:
With the changes in PR #139, specifying a symbolized value for the
`message` option would cause that method to be called on the Model
object. If that method didn't exist, it resulted in a `NoMethodError`
exception. If that method did exist in the Model, and also as an i18n
key, then the Model method was used, as opposed to the i18n key.

The `message` option is meant to either be a String, or a symbol
corresponding to an i18n key. Therefore, it should be read directly
from `options[:message]` and not sent for further processing by the
`options_value` method.

**How**:
- Revert the `error_message` method back to its value prior to PR #139,
so that it uses `options[:message]`
- Add 3 new specs to cover these scenarios

lib/validators/phony_validator.rb

@@ -15,7 +15,7 @@ def validate_each(record, attribute, value)
   private
 
   def error_message
-    options_value(:message) || :improbable_phone
+    options[:message] || :improbable_phone
   end
 
   def country_number
@@ -43,11 +43,11 @@ def normalized_country_code
   end
 
   def options_value(option)
-    if options[option].is_a?(Symbol)
-      @record.send(options[option])
-    else
-      options[option]
-    end
+    option_value = options[option]
+
+    return option_value if !option_value.is_a?(Symbol)
+
+    @record.send(option_value)
   end
 end
 

spec/lib/validators/phony_validator_spec.rb

@@ -143,6 +143,28 @@ class SymbolizableHelpfulHome < ActiveRecord::Base
   attr_accessor :phone_number, :phone_number_country_code
   validates_plausible_phone :phone_number, country_code: :phone_number_country_code
 end
+
+#--------------------
+class NoModelMethod < HelpfulHome
+  attr_accessor :phone_number
+  validates_plausible_phone :phone_number, country_code: :nonexistent_method
+end
+
+#--------------------
+class MessageOptionUndefinedInModel < HelpfulHome
+  attr_accessor :phone_number
+  validates_plausible_phone :phone_number, message: :email
+end
+
+#--------------------
+class MessageOptionSameAsModelMethod < HelpfulHome
+  attr_accessor :phone_number
+  validates_plausible_phone :phone_number, message: :email
+
+  def email
+    'user@example.com'
+  end
+end
 #-----------------------------------------------------------------------------------------------------------------------
 # Tests
 #-----------------------------------------------------------------------------------------------------------------------
@@ -544,5 +566,37 @@ class SymbolizableHelpfulHome < ActiveRecord::Base
         expect(@home.errors.messages).to include(phone_number: ['is an invalid number'])
       end
     end
+
+    #--------------------
+    context 'when a nonexistent method is passed as a symbol to an option other than message' do
+      it 'raises NoMethodError' do
+        @home = NoModelMethod.new
+        @home.phone_number = FRENCH_NUMBER_WITH_COUNTRY_CODE
+
+        expect { @home.save }.to raise_error(NoMethodError)
+      end
+    end
+
+    #--------------------
+    context 'when a nonexistent method is passed as a symbol to the message option' do
+      it 'does not raise an error' do
+        @home = MessageOptionUndefinedInModel.new
+        @home.phone_number = INVALID_NUMBER
+
+        expect { @home.save }.to_not raise_error
+      end
+    end
+
+    #--------------------
+    context 'when an existing Model method is passed as a symbol to the message option' do
+      it 'does not use the Model method' do
+        @home = MessageOptionSameAsModelMethod.new
+        @home.phone_number = INVALID_NUMBER
+
+        expect(@home).to_not receive(:email)
+
+        @home.save
+      end
+    end
   end
 end