feat: add pagination support to user media query

[vnugent]

Issue #320
Needed by frontend PR: OpenBeta/open-tacos#869

I followed GQL recommended approach for implementing a cursor-based pagination.

# Sample query
query GetNextPage {
  getUserMediaPagination(
    input: {userUuid: "b9f8ab3b-e6e5-4467-9adb-65d91c7ebe7c", first: 3, after: "1675245914389_645aa64261c73112fc19b505"}
  ) {
    userUuid
    mediaConnection {
      edges {
        cursor
        node {
          username
          mediaUrl
          entityTags {
            climbName
            id
          }
          id
        }
      }
    }
  }
}

[musoke]

I left one comment on something I may have misunderstood - other than that it looks good to me as a non-expert.

[musoke]

Ok, sounds good!

…

On Sun, Jul 2, 2023, 16:21 Viet Nguyen ***@***.***> wrote: ***@***.**** commented on this pull request. ------------------------------ In src/model/MediaDataSource.ts <#322 (comment)> : > @@ -20,6 +20,19 @@ export default class MediaDataSource extends MongoDataSource<MediaObject> { } }] + /** + * Find one media object by id. Throw an exception if not found. + * @param _id + */ + async getOneMediaObjectById (_id: mongoose.Types.ObjectId): Promise<MediaObject> { + const rs = await this.mediaObjectModel.find({ _id }).orFail(new Error('Media not found')).lean() + if (rs != null && rs.length === 1) { + return rs[0] + } + logger.error(`This shouldn't happend. Found multiple media objects for id: ${_id.toString()}`) + throw new Error('Media not found for id') I intentionally make the message slightly different than the case where there is 0 so we can debug the issue. And at the time, make it a bit vague in order to not scare users that we have corrupted data. Since media._id is unique theoretically we should never get back more than 1 document. — Reply to this email directly, view it on GitHub <#322 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AD7ET7BGP3C2DAYQVV62OFTXOHJ57ANCNFSM6AAAAAAZMYYGNM> . You are receiving this because your review was requested.Message ID: ***@***.***>