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I am a full-stack Ruby on Rails developer with experience in TDD, PostgreSQL, Docker, Heroku, performance optimization and Flutter mobile app development.

This post will help you understand the difference between Ruby's merge and Rails deep_merge method.

Merge

Ruby's merge method merges one hash into another, as it's name suggest

{ first_name: 'John' }.merge({ last_name: 'Doe' })
=> {:first_name=>"John", :last_name=>"Doe"}

Now lets say we have following 2 Hash objects

user1 = { name: 'John', address: { city: 'City' } }
user2 = { name: 'John', address: { zip: '12345' } }

And if we use .merge() this time the result will be:

user1.merge(user2)
=> {:name=>"John", :address=>{:zip=>"12345"}}

Deep Merge

And if we want to merge both city and zip addresses for the user, then we need to use .deep_merge() method

user1.deep_merge(user2)
=> {:name=>"John", :address=>{:city=>"City", :zip=>"12345"}}

NOTE: .deep_merge is a rails method and .merge is a ruby's method

Ruby merge Vs deep_merge

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Merge

Deep Merge

References:

Command Palette

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More from this blog

Merge

Deep Merge

References: