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1. class eval and instance eval class eval and instance eval

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   require 'pry'

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   class Person end

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   # this goes on an instance of a class

2. ruby yield with block given ruby yield with block given

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   require 'pry'

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   # a simple method with args

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   def save(x)

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     puts "#{x} example"

3. Upsert Through Prepared Statements A... Upsert Through Prepared Statements Active Record (Conflict Strategy)

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   # Reference for Next Time

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   # SQL: INSERT <..> ON CONFLICT(column_names_with_conflict,..) DO UPDATE SET <..> WHERE <..>

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   # Postgres does binding on $1 (format $number) using the params[non zero index]