[Missing Documentation] First field in collection "must" be a unique non null value

[ktutnik]

Looks like KnexNest uses the first data as a reference to create Hydration meta data, and Hydration will use it as a reference to distinct the data. I also found that #7 issue related with this.

example:

[{
    _id: 1,
    _name: "abc",
    _child__id:1, //<-- must unique non null
    _child__name:"def"
},
{
    _id: 1,
    _name: "abc",
    _child__id:2, //<-- must unique non null
    _child__name:"efg"
},]