discourse/db/migrate/20120518200115_create_read_...

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class CreateReadPosts < ActiveRecord::Migration[4.2]
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def up
create_table :read_posts, id: false do |t|
t.integer :forum_thread_id, null: false
t.integer :user_id, null: false
t.column :page, :integer, null: false
t.column :seen, :integer, null: false
end
add_index :read_posts, [:forum_thread_id, :user_id, :page], unique: true
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end
def down
drop_table :read_posts
end
end