hoangdangninh
7/5/2017 - 5:09 PM

class methods, instance methods introspection ruby/rails

class methods, instance methods introspection ruby/rails

class_instance_methods.rb
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# list class methods
SomeClass.methods

# list all instance methods of that class (including all inheritance methods)
SomeClass.instance_methods

# list ancesstor of that class
SomeClass.ancestors

# list public and protected instance methods of an object
<some_object>.methods

# list private instance methods of an object
<some_object>.private_methods


# In rails, list all database columns of a model
SomeModel.column_names   #=> <some_model_instance>.attribute_names

# To access instance variable do this
<some_object>.instance_variable_get(:@variable)