# Lazy loading of @Sibling relation

**URL:** <https://forums.swift.org/t/lazy-loading-of-sibling-relation/39451>\
**Category:** Related Projects\
**Tags:** fluent, vapor-4\
**Created:** [August 17, 2020, 6:37am UTC](https://forums.swift.org/t/lazy-loading-of-sibling-relation/39451 "2020-08-17T06:37:36Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![JetForMe](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/jetforme/32/482_2.png) [@JetForMe](https://forums.swift.org/u/JetForMe)\
**Post date:** [August 17, 2020, 6:37am UTC](https://forums.swift.org/t/lazy-loading-of-sibling-relation/39451/1 "2020-08-17T06:37:36Z")

</div>

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:

```swift
	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.

---

<div class="post-metadata">

**Author:** ![JetForMe](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/jetforme/32/482_2.png) [@JetForMe](https://forums.swift.org/u/JetForMe)\
**Post date:** [August 17, 2020, 6:54am UTC](https://forums.swift.org/t/lazy-loading-of-sibling-relation/39451/2 "2020-08-17T06:54:25Z")

</div>

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

```swift
	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.