ruby - Writing a rake task to amend current string while preserving the rest of the string Rails 4 -

i trying write rake task remove part of string while preserving rest. tried chomp , slice, unable work. below current rake task , string appear in db. currently, replace entire string whatever listed in pets column. not objective. need remove reference pets while keeping remainder of string in amenities column.

fix_pets.rake

namespace :listings   desc 'update old pets in db'     task fix_pets: :environment       listing.all.each |listing|         if listing.amenities == "all pets ok"           listing.update(amenities: listing.pets)         elsif listing.amenities == "pets upon approval"           listing.update(amenities: listing.pets)         end       end    end end 

amenities in db:

"central a/c pets ok hardwood floors"

after rake task, amenities field should have:

"central a/c hardwood floors"

probably better use include? if want conditionally change string.

if listing.amenities.include? 'all pets ok '   listing.update(amenities: listing.amenities.gsub('all pets ok ', '')) end