89 lines
2.2 KiB
Go
89 lines
2.2 KiB
Go
package migrations
|
|
|
|
import (
|
|
"context"
|
|
"time"
|
|
|
|
"git.handmade.network/hmn/hmn/src/migration/types"
|
|
"git.handmade.network/hmn/hmn/src/oops"
|
|
"github.com/jackc/pgx/v5"
|
|
)
|
|
|
|
func init() {
|
|
registerMigration(AddThreadAndPostConstraints{})
|
|
}
|
|
|
|
type AddThreadAndPostConstraints struct{}
|
|
|
|
func (m AddThreadAndPostConstraints) Version() types.MigrationVersion {
|
|
return types.MigrationVersion(time.Date(2021, 7, 28, 3, 36, 4, 0, time.UTC))
|
|
}
|
|
|
|
func (m AddThreadAndPostConstraints) Name() string {
|
|
return "AddThreadAndPostConstraints"
|
|
}
|
|
|
|
func (m AddThreadAndPostConstraints) Description() string {
|
|
return "Add back appropriate check constraints for the new thread model"
|
|
}
|
|
|
|
func (m AddThreadAndPostConstraints) Up(ctx context.Context, tx pgx.Tx) error {
|
|
// create null check constraints for threads
|
|
_, err := tx.Exec(ctx, `
|
|
ALTER TABLE handmade_thread
|
|
ADD CONSTRAINT thread_has_field_for_type CHECK (
|
|
CASE
|
|
WHEN type = 1 THEN
|
|
subforum_id IS NULL
|
|
AND personal_article_user_id IS NULL
|
|
WHEN type = 2 THEN
|
|
subforum_id IS NOT NULL
|
|
AND personal_article_user_id IS NULL
|
|
WHEN type = 7 THEN
|
|
subforum_id IS NULL
|
|
AND personal_article_user_id IS NOT NULL
|
|
ELSE TRUE
|
|
END
|
|
);
|
|
`)
|
|
if err != nil {
|
|
return oops.New(err, "failed to add constraint to threads")
|
|
}
|
|
|
|
// add constraints to posts
|
|
_, err = tx.Exec(ctx, `
|
|
CREATE FUNCTION thread_type_for_post(int) RETURNS int AS $$
|
|
SELECT thread.type
|
|
FROM
|
|
handmade_post AS post
|
|
JOIN handmade_thread AS thread ON post.thread_id = thread.id
|
|
WHERE post.id = $1
|
|
$$ LANGUAGE SQL;
|
|
|
|
CREATE FUNCTION project_id_for_post(int) RETURNS int AS $$
|
|
SELECT thread.project_id
|
|
FROM
|
|
handmade_post AS post
|
|
JOIN handmade_thread AS thread ON post.thread_id = thread.id
|
|
WHERE post.id = $1
|
|
$$ LANGUAGE SQL;
|
|
|
|
ALTER TABLE handmade_post
|
|
ADD CONSTRAINT post_thread_type_from_thread CHECK (
|
|
thread_type_for_post(id) = thread_type
|
|
),
|
|
ADD CONSTRAINT post_project_id_from_thread CHECK (
|
|
project_id_for_post(id) = project_id
|
|
);
|
|
`)
|
|
if err != nil {
|
|
return oops.New(err, "failed to add post constraints")
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (m AddThreadAndPostConstraints) Down(ctx context.Context, tx pgx.Tx) error {
|
|
panic("Implement me")
|
|
}
|