discourse/db/migrate/20140425135354_add_topic_cu...

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class AddTopicCustomFields < ActiveRecord::Migration[4.2]
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def change
create_table :topic_custom_fields do |t|
t.integer :topic_id, null: false
t.string :name, limit: 256, null: false
t.text :value
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t.timestamps null: false
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end
add_index :topic_custom_fields, [:topic_id, :name]
# migrate meta_data into custom fields
execute <<-SQL
INSERT INTO topic_custom_fields(topic_id, name, value)
SELECT id, (each(meta_data)).key, (each(meta_data)).value
FROM topics WHERE meta_data <> ''
SQL
remove_column :topics, :meta_data
end
end