Unable to serialize when has many relationship is empty

[stoicsquirrel]

The following error occurs in addon/index.js, line 21 when no items have yet been added to a has many relationship:

Uncaught TypeError: Cannot read property 'map' of undefined

if (relKind === "hasMany") {
  data.relationships[key].data = snapshot.hasMany(relKey).map(this.serializeRecord);
}

I am unsure as to why an undefined, rather than empty, object is being returned when calling snapshot.hasMany(relKey) on an empty relationship, but I added a test for undefined and it worked in my example. I was unable, though, to replicate this issue in a test, and I am unsure if this is the right solution to the problem.

if (relKind === "hasMany" && typeof(snapshot.hasMany(relKey)) !== "undefined") {
  data.relationships[key].data = snapshot.hasMany(relKey).map(this.serializeRecord);
}

Let me know if you need more info.

[frank06]

Thanks for reporting the issue! I will see what test I can add for that and fix it.