discourse/db/migrate/20201105190351_move_post_notices_to_json.rb

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# frozen_string_literal: true
class MovePostNoticesToJson < ActiveRecord::Migration[6.0]
def up
execute <<~SQL
INSERT INTO post_custom_fields(post_id, name, value, created_at, updated_at)
SELECT
posts.id,
'notice',
CASE
WHEN pcf_type.value = 'custom' THEN json_build_object('type', pcf_type.value, 'raw', pcf_args.value, 'cooked', pcf_args.value)
WHEN pcf_type.value = 'new_user' THEN json_build_object('type', pcf_type.value)
WHEN pcf_type.value = 'returning_user' THEN json_build_object('type', pcf_type.value, 'last_posted_at', pcf_args.value)
END,
pcf_type.created_at created_at,
pcf_type.updated_at updated_at
FROM posts
JOIN post_custom_fields pcf_type ON posts.id = pcf_type.post_id AND pcf_type.name = 'notice_type'
LEFT JOIN post_custom_fields pcf_args ON posts.id = pcf_args.post_id AND pcf_args.name = 'notice_args'
SQL
execute "DELETE FROM post_custom_fields WHERE name = 'notice_type' OR name = 'notice_args'"
add_index :post_custom_fields, :post_id, unique: true, name: "index_post_custom_fields_on_notice", where: "name = 'notice'"
remove_index :post_custom_fields, name: "index_post_custom_fields_on_notice_type"
remove_index :post_custom_fields, name: "index_post_custom_fields_on_notice_args"
end
def down
execute <<~SQL
INSERT INTO post_custom_fields(post_id, name, value, created_at, updated_at)
SELECT post_id, 'notice_type', value::json->>'type', created_at, updated_at
FROM post_custom_fields
WHERE name = 'notice'
SQL
execute <<~SQL
INSERT INTO post_custom_fields(post_id, name, value, created_at, updated_at)
SELECT post_id, 'notice_args', COALESCE(value::json->>'cooked', value::json->>'last_posted_at'), created_at, updated_at
FROM post_custom_fields
WHERE name = 'notice'
SQL
execute "DELETE FROM post_custom_fields WHERE name = 'notice'"
add_index :post_custom_fields, :post_id, unique: true, name: "index_post_custom_fields_on_notice_type", where: "name = 'notice_type'"
add_index :post_custom_fields, :post_id, unique: true, name: "index_post_custom_fields_on_notice_args", where: "name = 'notice_args'"
remove_index :index_post_custom_fields_on_notice
end
end