Prevent attr_encrypted from making queries on load

`#attribute_instance_methods_as_symbols` can trigger a query when the
schema cache is not loaded.

We only need the results of this method if
`attribute_instance_methods_as_symbols_available?` is true so we move
this inside the check.

Signed-off-by: Bojan Marjanovic <[email protected]>

Author: boimw

lib/attr_encrypted.rb

@@ -144,9 +144,8 @@ def attr_encrypted(*attributes)
     attributes.each do |attribute|
       encrypted_attribute_name = (options[:attribute] ? options[:attribute] : [options[:prefix], attribute, options[:suffix]].join).to_sym
 
-      instance_methods_as_symbols = attribute_instance_methods_as_symbols
-
       if attribute_instance_methods_as_symbols_available?
+        instance_methods_as_symbols = attribute_instance_methods_as_symbols
         attr_reader encrypted_attribute_name unless instance_methods_as_symbols.include?(encrypted_attribute_name)
         attr_writer encrypted_attribute_name unless instance_methods_as_symbols.include?(:"#{encrypted_attribute_name}=")