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Match error reported on '_id' field

See original GitHub issue

When validating collection documents against a schema (of type SimpleSchema), I get the following Match error: _id is not allowed by the schema

Stack trace of Match Error:

W20150623-22:26:48.348(2)? (STDERR) Error: Match error: _id is not allowed by the schema
W20150623-22:26:48.348(2)? (STDERR)     at [object Object].SimpleSchema.condition (packages/aldeed:simple-schema/simple-schema.js:602:1)
W20150623-22:26:48.349(2)? (STDERR)     at checkSubtree (packages/check/match.js:220:1)
W20150623-22:26:48.349(2)? (STDERR)     at check (packages/check/match.js:32:1)
W20150623-22:26:48.349(2)? (STDERR)     at app/server/bootstrap.js:72:5
W20150623-22:26:48.349(2)? (STDERR)     at [object Object]._.extend.forEach (packages/mongo/mongo_driver.js:965:1)
W20150623-22:26:48.349(2)? (STDERR)     at [object Object].Cursor.(anonymous function) [as forEach] (packages/mongo/mongo_driver.js:812:1)
W20150623-22:26:48.349(2)? (STDERR)     at validateFosMap (app/server/bootstrap.js:71:20)
W20150623-22:26:48.349(2)? (STDERR)     at app/server/bootstrap.js:2:3
W20150623-22:26:48.349(2)? (STDERR)     at /home/.../boot.js:229:5

Code from ‘bootstrap.js’:

function validateFosMap() {
  var qualFosMapCursor = QualificationFieldOfStudyMap.find();

  qualFosMapCursor.forEach(function (fosMapping) {
    check(fosMapping, QualificationFieldOfStudySchema);
  });
}

Schema definition:

QualificationFieldOfStudySchema = new SimpleSchema({
  fieldOfStudy: {
    type: String,
    label: 'Field of Study'
  },
  mappedKeywords: {
    type: [String],
    label: 'Mapped Keywords',
    minCount: 1
  },
  fieldOfStudyId: {
    type: String,
    label: 'ID (don\'t set or update)',
    autoValue: function () {
      var fos = this.field('fieldOfStudy');
      if (fos.isSet) {
        return fos.value.replace(/\s/g, ''); // remove spaces
      } else {
        this.unset(); // prevent user from setting their own value
      }
    }
  }
})

Example document:

{
  "_id" : ObjectId("5585630935f8834cf6939a59"),
  "fieldOfStudy" : "Theology",
  "fieldOfStudyId" : "Theology",
  "mappedKeywords" : [ "theology", "ministry" ] 
}

Please let me know if I can provide any additional information.