问题
I'm trying to create an argument type using type-graphql
to accept arguments through the GraphQL query. The sort
I'm talking about is a property of the options found on MongoDB's native NodeJS driver documentation.
@ArgsType()
export class FindAllArgs implements FindOneOptions {
@Field(type => Int, { defaultValue: 0, description: 'Sets the limit of documents returned in the query.' })
@Min(0)
limit?: number;
// This is where the custom sort would go about.
@Field(type => SortScalar)
sort?: sortScalar;
@Field(type => Int, { defaultValue: 0, description: 'Set to skip N documents ahead in your query (useful for pagination).' })
@Min(0)
skip?: number;
}
As you can see, simple types are fine, but when it comes to something like the sort object, I'm not sure how to go on about it.
NestJS implements a date scalar like so:
import { Scalar, CustomScalar } from '@nestjs/graphql';
import { Kind, ValueNode } from 'graphql';
@Scalar('Date', type => Date)
export class DateScalar implements CustomScalar<number, Date> {
description = 'Date custom scalar type';
parseValue(value: number): Date {
return new Date(value); // value from the client
}
serialize(value: Date): number {
return value.getTime(); // value sent to the client
}
parseLiteral(ast: ValueNode): Date {
if (ast.kind === Kind.INT) {
return new Date(ast.value);
}
return null;
}
}
Even in the example, it uses a returnTypeFunction @Scalar('Date', type => Date)
. What am I supposed to replace Date
with? What do I put in for parseValue
, serialize
, and parseLiteral
?
回答1:
You can just use @InputType
to nest objects in args - you don't need scalars for that, they are designed only for serializable things like timestamp -> number, mongo id -> ObjectId instance, etc.
来源:https://stackoverflow.com/questions/58976826/how-to-implement-graphql-scalar-for-mongodb-sort-property-found-in-collection-fi