Refactored computations again, split into multiple files, lots still to do

app/imports/api/creature/computation/getCalculationProperties.js

@@ -0,0 +1,40 @@
+import Creatures from "/imports/api/creature/Creatures.js";
+import CreatureProperties from "/imports/api/creature/CreatureProperties.js";
+
+export default function getCalculationProperties(creatureId){
+  // First get ids of disabled properties and unequiped items
+  let disabledAncestorIds = CreatureProperties.find({
+    'ancestors.id': creatureId,
+    $or: [
+      {disabled: true},
+      {equipped: false},
+    ],
+  }, {
+    fields: {_id: 1},
+  }).map(prop => prop._id);
+
+  // Then get the ids of creatures that are children of this creature
+  // to isolate their decendent properties from this calculation
+  Creatures.find({
+    'ancestors.id': creatureId,
+  }, {
+    fields: {_id: 1},
+  }).forEach(prop => {
+    disabledAncestorIds.push(prop._id);
+  });
+
+  // Get all the properties that aren't from the excluded decendents
+  return CreatureProperties.find({
+    'ancestors.id': {
+      $eq: creatureId,
+      $nin: disabledAncestorIds,
+    },
+    type: {$in: [
+      'attribute',
+      'skill',
+      'damageMultiplier',
+      'effect',
+      'proficiency',
+    ]},
+  }).fetch();
+}