discourse/db/migrate/20120523180723_create_views.rb

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class CreateViews < ActiveRecord::Migration[4.2]
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def change
create_table :views, id: false do |t|
t.integer :parent_id, null: false
t.string :parent_type, limit: 50, null: false
t.integer :ip, limit: 8, null: false
t.datetime :viewed_at, null: false
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t.integer :user_id, null: true
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end
add_index :views, [:parent_id, :parent_type]
add_index :views, [:parent_id, :parent_type, :ip, :viewed_at], unique: true, name: "unique_views"
end
end