Feature Request: clear

It would be nice to clear the part of previous node. In knex, there is a clear method.

const query = knex("Table").select("a","b") // SELECT a, b FROM Table
query.clear("select")
query.select("a") // SELECT a FROM Table

This is a useful feature for reusing parts of queries.

[koskimas]

That’s a good example. We need separate clearSelect(), clearLimit() etc. methods instead of a clear(what) method. For example clearSelect() will change the query builder type. Some clear methods like clearJoin() shouldn’t be implemented because of what it would do to the types. Removing a join and keeping a selection from that table will mess up the types (and the query too).

[thelinuxlich]

I was thinking of something like

import { ExpressionBuilder, SelectExpression, sql } from "kysely";
export default <DB, TB extends keyof DB, S extends SelectExpression<DB, TB>>(
	eb: ExpressionBuilder<DB, TB>,
        field: S, 
        sortField: S,
        sortDirection = "asc",
        limit = 10,
        offset = 1,
) => {
	return eb.select(qb => qb.fn.count<number>(field).as("count")).limit(limit).offset(offset).orderBy(sortField, sortDirection)
};

// usage
query.call(qb => countHelper(qb, "id", "created_at"))