A guide on retrieving TypeScript mongoose/typegoose schema

Here is a defined schema for an account

class AccountSchema;

Below is the model declaration for the account

const AccountClass: Model<AccountSchema & Document>;
class Account extends AccountClass;

Why isn't this functioning as expected?

type ExtractSchema<T extends Model<Document>> = T extends Model<infer D & Document> ? D : never;
class Service<T extends Model<ExtractSchema<T> & Document>> {
  public async getSchema(): ExtractSchema<T>;
}
class AccountService extends Service<typeof Account> {
  public test() {
   [ERROR: this.getSchema() returns never]
   this.getSchema()
  }
}

What is the most effective approach to extract the schema using generics without involving Javascript getter and setter functions, but only plain fields?

Answer №1

When utilizing typegoose or mongoose, the following code snippet is effective

class Service<T extends Model<ExtractSchema<T> & Document>> {
  public async getSchema(): ExtractSchema<T> {
   return this.schema; 
  }
}

this.schema will retrieve the schema when invoked from a document, otherwise the static keyword must be added to create it as a static function (accessible from the model)

For data types, specify

mongoose.Schema<typeof YourClass>
as the return type for getSchema to ensure it returns a schema instead of a model during runtime

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