K
Kysely9mo ago
NestarZ

How to loop an array and based on this create a dynamic CTE but preserve type ?

for (const [references, columns] of referencesArray) {
const newQb = qb.with(`cte_${references}`, (wb) => {
wb = wb.selectFrom(references).distinct().selectAll(references);
for (const column of columns) {
wb = wb.innerJoin(
tableName,
sql.ref(`${tableName}.${column.name}`),
sql.ref(`${column.references}.${column.to}`)
);
}
return wb;
});
qb = newQb as any;
}
for (const [references, columns] of referencesArray) {
const newQb = qb.with(`cte_${references}`, (wb) => {
wb = wb.selectFrom(references).distinct().selectAll(references);
for (const column of columns) {
wb = wb.innerJoin(
tableName,
sql.ref(`${tableName}.${column.name}`),
sql.ref(`${column.references}.${column.to}`)
);
}
return wb;
});
qb = newQb as any;
}
But this is not optimal
Solution:
It's impossible to do this while keeping the types. Not only because of Kysely but also because of typescript. - You can't change the type of a variable in typescript. - You can't turn a string into a string literal. - Even if your strings had string literal types, you couldn't loop over them...
Jump to solution
4 Replies
Solution
koskimas
koskimas9mo ago
It's impossible to do this while keeping the types. Not only because of Kysely but also because of typescript. - You can't change the type of a variable in typescript. - You can't turn a string into a string literal. - Even if your strings had string literal types, you couldn't loop over them - etc. - etc. - etc.
NestarZ
NestarZOP9mo ago
ok!! so I can’t apply a reduce function to a QueryBuilder type ?
koskimas
koskimas9mo ago
You can't change the type of a variable If the type doesn't change, you can reduce it
NestarZ
NestarZOP9mo ago
ok thanks will try!! congratz on your helpful work
Want results from more Discord servers?
Add your server