node.js - Populate array with object ID inside -

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I have this in my model:

User.js: 

  ... User Group: [{User Group: {type: mongoose.Schema.Types.ObjectId, Reference: 'UserGroup'}, Status: {Type: string, Default: 'Pending'}}], .. .   
 When a user joins the user group, the group id user is stored in the user group area of ​​the model array, and the status field is pending pending, an administrator Is awaiting approval. I can not fill a problem with an array of IDs, but I'm not sure when the field is populated then it is connected with the other.  
 Am I doing my model wrong or something is obvious?  
 Please help!  
 Thanks   
 
 
 What are you looking for this?  
  Schema.Fund ({}). Populate ('UserGroup User User'). Exec (...);

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