Populate nested model in mongoose-CodePudding

I got this mongoose schema

    const UserSchema = new Schema({
      email: {
        type: String,
        required: true,
        unique: true,
      },
      groups: [
        {
          groupName: {
            type: String,
            required: true,
          },
          groupMembers: [{ type: Schema.Types.ObjectId, ref: "GroupMember" }],
        },
      ],
    });

I am trying to populate the groupMembers

    const user = await User.findById(req.params.userId).populate({
          path: "groups",
          populate: {
            path: "groupMembers",
          },
        });

When I am logging the 'user', the groupMembers array is not populated, it's empty(even though I have objects inside).

Edit: found the solution- the problem was that when I added new GroupMember I did'nt .save() it.

CodePudding user response：

Try this:

const user = await User.findById(req.params.userId).populate('groups.groupMembers');