Console Debugging in Rails

if you don't know where a method is defined but you know the class you can type

ClassName.method(:method_name).source
# or 
ClassName.method(:method_name).source_location
# or
show_source("ClassName.method_name.as_a_string")

obviously substituting the class name and method name to make it make sense

Finding Possible Methods

if you need to find a method that should start with or contain certain phrase:

ClassName.methods.map(&:to_s).select { |x| x.include?("phrase") }.map { |x| puts x }

These 2 in conjunction means that you can find the location and implementation of all methods that you need to use whether you know it exists or not, this will give you a smaller area to cover