[loopbackjs]how to do where not in (select xxx) query - loopbackjs

Question

I'd love to use loopback 4 whereBuilder to build a query like 'select * from file where id not in (select fileId from workFile where workId='xxxxx')' and I tried this:
const fileIdArray = await this.workFileRepository.find({
where: {
fileId: {
eq: xxx
}
}
});
const ret = await this.fileRepository.find({
where: {
id: {
nin: fileIdArray
}
}
})
and
const ret = await this.fileRepository.find({
where: {
id: {
nin: () => {
return await this.workFileRepository.find({
where: {
fileId: {
eq: id
}
}
})
}
}
}
})
but both of them are wrong , what should i do ?
this is the error:
error TS2345: Argument of type '{ where: { id: { nin: () => (WorkFile & WorkFileRelations)[]; }; }; }' is not assignable to parameter of type 'Filter<File>'.
Types of property 'where' are incompatible.
Type '{ id: { nin: () => (WorkFile & WorkFileRelations)[]; }; }' is not assignable to type 'Condition<File> | AndClause<File> | OrClause<File> | undefined'.
Type '{ id: { nin: () => (WorkFile & WorkFileRelations)[]; }; }' is not assignable to type 'Condition<File>'.
Types of property 'id' are incompatible.
Type '{ nin: () => (WorkFile & WorkFileRelations)[]; }' is not assignable to type 'string | (string & Date) | PredicateComparison<string> | undefined'.
Type '{ nin: () => (WorkFile & WorkFileRelations)[]; }' is not assignable to type 'PredicateComparison<string>'.
Types of property 'nin' are incompatible.
Type '() => (WorkFile & WorkFileRelations)[]' is missing the following properties from type 'string[]': pop, push, concat, join, and 25 more.
86 const ret = await this.fileRepository.find({
~
87 where: {
the correct format is like this:
const ret = await this.fileRepository.find({
where: {
id: {
nin: ["xxxxxx2","xxxxxx3"]
}
}
})
but if i change to
const ret = await this.fileRepository.find({
where: {
id: {
nin: ()=>{
return ['xxxxx2','xxxx3']
}
}
}
})
its wrong, i don't know if someone know and use this framework

Answer 1

i found the solution , first i fetch the included ids:
const inqFileCollectionss = await this.workFileRepository.find({
where: {
workId: {
eq: id
}
}
});
const inqFileIds = inqFileCollectionss.map(item => item.fileId)
and then i fetch like this:
const data = await this.fileRepository.find({
where: {
id: {
nin: inqFileIds
}
},
limit: pageSize,
skip: pageIndex
})