Module: MetaInstance::InstanceMethodDefine

Extended by:
ActiveSupport::Concern
Included in:
Proxy
Defined in:
lib/meta_instance/instance_method_define.rb

Overview

This is based on a few things from reference.jumpingmonkey.org/programming_languages/ruby/ruby-metaprogramming.html

allows the adding of methods to instances, but not the entire set of instances for a particular class

Constant Summary collapse

METHOD_BACKUP_KEY =

when a method is stubbed with snapshot data, we stare the original method prixefixed with this:

"_mata_instance_backup_current_"

Instance Method Summary collapse

Instance Method Details

#backup_method(name) ⇒ Object

backs up a method in case we want to restore it later



34
35
36
37
38
 
# File 'lib/meta_instance/instance_method_define.rb', line 34

def backup_method(name)
  meta_eval {
    alias_method "#{METHOD_BACKUP_KEY}#{name}", name
  }
end

#define_method(name, &block) ⇒ Object

Adds methods to a singletonclass define_singleton_method(name, &block) is the same as doing

meta_eval 

define_method(name, &block)




29
30
31
 
# File 'lib/meta_instance/instance_method_define.rb', line 29

def define_method(name, &block)
  define_singleton_method(name, &block)
end

#instance_override(name, &block) ⇒ Object

backs up and overrides a method. but don’t override if we already have overridden this method



16
17
18
19
20
21
 
# File 'lib/meta_instance/instance_method_define.rb', line 16

def instance_override(name, &block)
  unless respond_to?("#{METHOD_BACKUP_KEY}#{name}")
    backup_method(name)
  end
  define_method(name, &block)
end

#restore_method(name) ⇒ Object

the original method becomes reaccessible



41
42
43
44
45
46
47
48
 
# File 'lib/meta_instance/instance_method_define.rb', line 41

def restore_method(name)
  if respond_to?("#{METHOD_BACKUP_KEY}#{name}")
    meta_eval {
      alias_method name, "#{METHOD_BACKUP_KEY}#{name}"
      remove_method "#{METHOD_BACKUP_KEY}#{name}"
    }
  end
end