PUT endpoint for batch changes

[ashayp22]

Is your feature request related to a problem? Please describe.

We will need some endpoints that let us make changes to more than one units and lessons at the same time. For example, if we were to re-order the lessons for a specific unit.

Describe the solution you'd like

Let's assume that this is a batch endpoint for making changes to all of the units for a specific _course_id. The input for this endpoint should be a list of units, where a single unit should be in the following format:

{
  name: { type: String, required: true },
  _order: { type: Number, required: true, index: true },
  selected: { type: Boolean, required: true },
  description: { type: String, required: true, default: '' },
}

Once we get the input, we should do the following:

1. Make sure that the _order goes 0, 1, 2, 3....
2. For each unit pushed, update its document in MongoDB.

Resources

1. JavaScript map method
2. Mongoose documentation

[ashayp22]

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