An assignment is the relationship between a User and a Path.
The format for an assignment object is as follows:
{
"id": "481a8f52-b069-12e8-8d40-06cfa4e7b2f4",
"userId": 1231123,
"trainingSeriesId": "2be286b4-ad4f-11e8-c7e9-065821035730",
"assignerId": 13211123,
"dueDate": 1536278400000,
"overallGrade": null,
"isCompleted": false,
"createdAt": 1536082766785,
"updatedAt": 1536082766785,
"createdThrough": null,
"numModules": 4,
"modulesCompleted": 2,
"completionPercentage": 50
}