How to check if a colum is present in table in rails migration

user_1578898 0
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currently rails version 5.

In it I want to write the migration in condition that migration should run only when the field does not exist in the database for a particular table.

Please suggest how to implement it in rails, Thanks in advance.

ruby-on-rails-5
1 Answers
  def self.up
    unless ActiveRecord::Base.connection.column_exists?(:table_name, :column_name)
      add_column :table_name, :column_name, :data_type
    end
  end
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