Lazy loading of @Sibling relation

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1

I have a schema with User, Organization, and UserOrganization pivot table. I want my /users/current endpoint to return a UserDTO with the user’s organizations filled out. I'm trying to do it like this:

	func getCurrentUser(_ req: Request) throws -> EventLoopFuture<UserDTO> {
		let userID = try req.auth.userID()
		
		return req.users
			.find(id: userID)
			.unwrap(or: AuthenticationError.userNotFound)
			.map
			{ inUser in
				return inUser.$organizations.get(reload: true, on: req.db)
					.map
					{ inOrgs in
						UserDTO(from: inUser, organizations: inOrgs.organizations.map { OrganizationContent(from: $0) })
					}
			}
	}

But the compiler complains about the middle map: Cannot invoke 'map' with an argument list of type '(@escaping (_) -> _)'

I don't want to eager-load the orgs in req.users.find(id:), because they're not always necessary. I've tried a few ways with both get() and load(), but I can't seem to figure out the right way to write this.

2

Ah, I finally figured it out (Thanks to Mads on Discord):

	func getCurrentUser(_ req: Request) throws -> EventLoopFuture<UserDTO> {
		let userID = try req.auth.userID()
		
		return req.users
			.find(id: userID)
			.unwrap(or: AuthenticationError.userNotFound)
			.flatMap
			{ inUser in
				return inUser.$organizations.get(on: req.db)
					.map
					{ inOrgs in
						UserDTO(from: inUser, organizations: inOrgs.map { OrganizationContent(from: $0) })
					}
			}
	}

Now I'm trying to understand if that can be written in chained fashion, to avoid nesting closures.