NameError: uninitialized constant ActiveRecord::Migrator::Zlib

Question

I'm new to Ruby and Active Record. I'm trying to run my first migration with the command:

rake db:migrate

I keep getting this error:

NameError: uninitialized constant ActiveRecord::Migrator::Zlib.

I've tried with different projects and all migrations are getting this error.

Answer 1

I don't know whats up with this, took my entire day to find a solution

at the top of your environment.rb

require 'zlib'

this worked for me :)

Answer 2

Add the following to Rakefile:

require 'zlib'