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class AddProjectsTrackersUniqueIndex < ActiveRecord::Migration[4.2]
def self.up
remove_duplicates
add_index :projects_trackers, [:project_id, :tracker_id], :name => :projects_trackers_unique, :unique => true
end
def self.down
remove_index :projects_trackers, :name => :projects_trackers_unique
end
# Removes duplicates in projects_trackers table
def self.remove_duplicates
Project.all.each do |project|
ids = project.trackers.collect(&:id)
unless ids == ids.uniq
project.trackers.clear
project.tracker_ids = ids.uniq
end
end
end
end
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