*Code to save Client and Scope:*

```javascript
     let scope = new ScopeModel();
     scope.client = client._id;
     scope.markModified('client');
     console.log(scope);
     await scope.save();
```

*What's in the DB after save*

_id:5a0d80d892a84d0e4d144d45
__v:0

*My Scope Schema Model:*

import mongoose from 'mongoose';
let Schema = mongoose.Schema;

var ScopeSchema = Schema({
    client: [{ type: Schema.Types.ObjectId, ref: 'Client' }],
    service: [{ type: Schema.Types.ObjectId, ref: 'Service' }],
    grant: [{ type: Schema.Types.ObjectId, ref: 'Grant' }]
});

export default ScopeSchema;