/**
 * In V4 slug fields contained a unique index.
 * In V5 slug fields should not have a unique index.
 *
 * This migration drops existing unique indexes from slug fields so downstream migrations
 * can work on the data without violating the unique index.
 */ const dropIndex = async (knex, tableName, columnName)=>{
    try {
        await knex.schema.alterTable(tableName, (table)=>{
            // NOTE: Can not use "identifiers" utility, as the 5.0.0-01 migration does not rename this particular index
            // to `tableName_columnName_uq`.
            table.dropUnique([
                columnName
            ], `${tableName}_${columnName}_unique`);
        });
    } catch (error) {
    // If unique index does not exist, do nothing
    }
};
const dropSlugFieldsIndex = {
    name: '5.0.0-05-drop-slug-fields-index',
    async up (knex, db) {
        for (const meta of db.metadata.values()){
            const hasTable = await knex.schema.hasTable(meta.tableName);
            if (!hasTable) {
                continue;
            }
            for (const attribute of Object.values(meta.attributes)){
                if (attribute.type === 'uid' && attribute.columnName) {
                    await dropIndex(knex, meta.tableName, attribute.columnName);
                }
            }
        }
    },
    async down () {
        throw new Error('not implemented');
    }
};

export { dropSlugFieldsIndex };
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