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Visual Call Graph will help you visualize how a method works by creating a call graph of all the other methods called.

Visual Call Graph

This gem will produce a call graph using Graphviz.

https://i2.wp.com/www.rubyguides.com/wp-content/uploads/2017/01/visual_call_graph.png

Example

require 'visual_call_graph'

VisualCallGraph.trace { Users.all }

More Details

https://www.rubyguides.com/2017/01/spy-on-your-ruby-methods/