class AddProjectsTrackersUniqueIndex < ActiveRecord::Migration 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 ad899a8447'/> Vaadin web components: https://github.com/vaadin/vaadin-corewww-data
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