Rails comment out migration file for development? - ruby-on-rails

Question

I'm running this migration file on local and running into problems because part is MySQL which does not work because I'm using Sqlite3. I want to make sure the SQL runs only in production not in development. I understand I need to wrap part of this with this comment so that I can successfully run this migration:
unless Rails.env == "development".
How can I add this to the script below?
class Places < ActiveRecord::Migration
def self.up
create_table :countries do |t|
t.string :name, :limit => 50, :null => false
t.string :fips104, :limit => 2, :null => false
t.string :iso2, :limit => 2, :null => false
t.string :iso3, :limit => 3, :null => false
t.string :ison, :limit => 4, :null => false
t.string :internet, :limit => 2, :null => false
t.string :capital, :limit => 25
t.string :map_reference, :limit => 50
t.string :nationality_singular, :limit => 35
t.string :nationaiity_plural, :limit => 35
t.string :currency, :limit => 30
t.string :currency_code, :limit => 3
t.integer :population
t.string :title, :limit => 50
t.string :comment, :limit => 255
t.timestamps
end
create_table :regions do |t|
t.references :country, :null => false
t.string :name, :limit => 45, :null => false
t.string :code, :limit => 8, :null => false
t.string :adm1code, :limit => 4, :null => false
t.timestamps
end
create_table :cities do |t|
t.references :country, :null => false
t.references :region, :null => false
t.string :name, :limit => 45, :null => false
t.float :latitude, :null => false
t.float :longitude, :null => false
t.string :timezone, :limit => 10, :null => false
t.integer :dma_id
t.string :county, :limit => 25
t.string :code, :limit => 4
t.timestamps
end
add_index :cities, :name
execute "LOAD DATA INFILE '#{RAILS_ROOT}/db/migrate/Countries.txt' INTO TABLE countries
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '\"' LINES TERMINATED BY '\r\n' IGNORE 1 LINES;"
execute "LOAD DATA INFILE '#{RAILS_ROOT}/db/migrate/Regions.txt' INTO TABLE regions
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '\"' LINES TERMINATED BY '\r\n' IGNORE 1 LINES;"
execute "LOAD DATA INFILE '#{RAILS_ROOT}/db/migrate/Cities.txt' INTO TABLE cities
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '\"' LINES TERMINATED BY '\r\n' IGNORE 1 LINES;"
end
def self.down
drop_table :countries
drop_table :regions
drop_table :cities
end
end

Answer 1

In your self.up method you can check environment like below:
if Rails.env.production?
#your mysql code which runs only in production env
end