perf: memoize toJSON / toObject default options

lib/document.js

@@ -22,7 +22,6 @@ const clone = require('./helpers/clone');
 const compile = require('./helpers/document/compile').compile;
 const defineKey = require('./helpers/document/compile').defineKey;
 const flatten = require('./helpers/common').flatten;
-const get = require('./helpers/get');
 const getEmbeddedDiscriminatorPath = require('./helpers/document/getEmbeddedDiscriminatorPath');
 const getKeysInSchemaOrder = require('./helpers/schema/getKeysInSchemaOrder');
 const getSubdocumentStrictValue = require('./helpers/schema/getSubdocumentStrictValue');
@@ -3798,15 +3797,7 @@ Document.prototype.$__handleReject = function handleReject(err) {
  */
 
 Document.prototype.$toObject = function(options, json) {
-  const path = json ? 'toJSON' : 'toObject';
-  const baseOptions = this.constructor &&
-    this.constructor.base &&
-    this.constructor.base.options &&
-    get(this.constructor.base.options, path) || {};
-  const schemaOptions = this.$__schema && this.$__schema.options || {};
-  // merge base default options with Schema's set default options if available.
-  // `clone` is necessary here because `utils.options` directly modifies the second input.
-  const defaultOptions = Object.assign({}, baseOptions, schemaOptions[path]);
+  const defaultOptions = this.$__schema._defaultToObjectOptions(json);
 
   // If options do not exist or is not an object, set it to empty object
   options = utils.isPOJO(options) ? { ...options } : {};
@@ -3815,18 +3806,18 @@ Document.prototype.$toObject = function(options, json) {
   let _minimize;
   if (options._calledWithOptions.minimize != null) {
     _minimize = options.minimize;
-  } else if (defaultOptions.minimize != null) {
+  } else if (defaultOptions != null && defaultOptions.minimize != null) {
     _minimize = defaultOptions.minimize;
   } else {
-    _minimize = schemaOptions.minimize;
+    _minimize = this.$__schema.options.minimize;
   }
 
   options.minimize = _minimize;
   options._seen = options._seen || new Map();
 
   const depopulate = options._calledWithOptions.depopulate
     ?? options._parentOptions?.depopulate
-    ?? defaultOptions.depopulate
+    ?? defaultOptions?.depopulate
     ?? false;
   // _isNested will only be true if this is not the top level document, we
   // should never depopulate the top-level document
@@ -3835,9 +3826,11 @@ Document.prototype.$toObject = function(options, json) {
   }
 
   // merge default options with input options.
-  for (const key of Object.keys(defaultOptions)) {
-    if (options[key] == null) {
-      options[key] = defaultOptions[key];
+  if (defaultOptions != null) {
+    for (const key of Object.keys(defaultOptions)) {
+      if (options[key] == null) {
+        options[key] = defaultOptions[key];
+      }
     }
   }
   options._isNested = true;
@@ -4118,10 +4111,10 @@ function applyVirtuals(self, json, options, toObjectOptions) {
     }
     if (assignPath.indexOf('.') === -1 && assignPath === path) {
       v = self.get(path, null, { noDottedPath: true });
-      v = clone(v, options);
       if (v === void 0) {
         continue;
       }
+      v = clone(v, options);
       json[assignPath] = v;
       continue;
     }

lib/model.js

@@ -5105,6 +5105,8 @@ Model.recompileSchema = function recompileSchema() {
     }
   }
 
+  delete this.schema._defaultToObjectOptionsMap;
+
   applyEmbeddedDiscriminators(this.schema, new WeakSet(), true);
 };
 

lib/schema.js

@@ -643,6 +643,30 @@ Schema.prototype.discriminator = function(name, schema, options) {
   return this;
 };
 
+/*!
+ * Get this schema's default toObject/toJSON options, including Mongoose global
+ * options.
+ */
+
+Schema.prototype._defaultToObjectOptions = function(json) {
+  const path = json ? 'toJSON' : 'toObject';
+  if (this._defaultToObjectOptionsMap && this._defaultToObjectOptionsMap[path]) {
+    return this._defaultToObjectOptionsMap[path];
+  }
+
+  const baseOptions = this.base &&
+    this.base.options &&
+    this.base.options[path] || {};
+  const schemaOptions = this.options[path] || {};
+  // merge base default options with Schema's set default options if available.
+  // `clone` is necessary here because `utils.options` directly modifies the second input.
+  const defaultOptions = Object.assign({}, baseOptions, schemaOptions);
+
+  this._defaultToObjectOptionsMap = this._defaultToObjectOptionsMap || {};
+  this._defaultToObjectOptionsMap[path] = defaultOptions;
+  return defaultOptions;
+};
+
 /**
  * Adds key path / schema type pairs to this schema.
  *

test/document.test.js

@@ -100,15 +100,6 @@ schema.path('date').set(function(v) {
   return v;
 });
 
-/**
- * Method subject to hooks. Simply fires the callback once the hooks are
- * executed.
- */
-
-TestDocument.prototype.hooksTest = function(fn) {
-  fn(null, arguments);
-};
-
 const childSchema = new Schema({ counter: Number });
 
 const parentSchema = new Schema({
@@ -433,9 +424,10 @@ describe('document', function() {
       delete ret.oids;
       ret._id = ret._id.toString();
     };
+    delete doc.schema._defaultToObjectOptionsMap;
     clone = doc.toObject();
     assert.equal(doc.id, clone._id);
-    assert.ok(undefined === clone.em);
+    assert.strictEqual(clone.em, undefined);
     assert.ok(undefined === clone.numbers);
     assert.ok(undefined === clone.oids);
     assert.equal(clone.test, 'test');
@@ -452,6 +444,7 @@ describe('document', function() {
       return { myid: ret._id.toString() };
     };
 
+    delete doc.schema._defaultToObjectOptionsMap;
     clone = doc.toObject();
     assert.deepEqual(out, clone);
 
@@ -489,6 +482,7 @@ describe('document', function() {
 
     // all done
     delete doc.schema.options.toObject;
+    delete doc.schema._defaultToObjectOptionsMap;
   });
 
   it('toObject transform', async function() {
@@ -884,6 +878,7 @@ describe('document', function() {
       };
 
       doc.schema.options.toJSON = { virtuals: true };
+      delete doc.schema._defaultToObjectOptionsMap;
       let clone = doc.toJSON();
       assert.equal(clone.test, 'test');
       assert.ok(clone.oids instanceof Array);
@@ -897,6 +892,7 @@ describe('document', function() {
       delete path.casterConstructor.prototype.toJSON;
 
       doc.schema.options.toJSON = { minimize: false };
+      delete doc.schema._defaultToObjectOptionsMap;
       clone = doc.toJSON();
       assert.equal(clone.nested2.constructor.name, 'Object');
       assert.equal(Object.keys(clone.nested2).length, 1);
@@ -932,6 +928,7 @@ describe('document', function() {
         ret._id = ret._id.toString();
       };
 
+      delete doc.schema._defaultToObjectOptionsMap;
       clone = doc.toJSON();
       assert.equal(clone._id, doc.id);
       assert.ok(undefined === clone.em);
@@ -951,6 +948,7 @@ describe('document', function() {
         return { myid: ret._id.toString() };
       };
 
+      delete doc.schema._defaultToObjectOptionsMap;
       clone = doc.toJSON();
       assert.deepEqual(out, clone);
 
@@ -988,6 +986,7 @@ describe('document', function() {
 
       // all done
       delete doc.schema.options.toJSON;
+      delete doc.schema._defaultToObjectOptionsMap;
     });
 
     it('jsonifying an object', function() {
@@ -998,7 +997,7 @@ describe('document', function() {
       // parse again
       const obj = JSON.parse(json);
 
-      assert.equal(obj.test, 'woot');
+      assert.equal(obj.test, 'woot', JSON.stringify(obj));
       assert.equal(obj._id, oidString);
     });
 

test/document.unit.test.js

@@ -4,6 +4,7 @@
 
 'use strict';
 
+const Schema = require('../lib/schema');
 const start = require('./common');
 
 const assert = require('assert');
@@ -37,12 +38,9 @@ describe('toObject()', function() {
 
   beforeEach(function() {
     Stub = function() {
-      const schema = this.$__schema = {
-        options: { toObject: { minimize: false, virtuals: true } },
-        virtuals: { virtual: 'test' }
-      };
+      this.$__schema = new Schema({}, { toObject: { minimize: false, virtuals: true } });
+      this.$__schema.virtual('virtual').get(function() { return 'test'; });
       this._doc = { empty: {} };
-      this.get = function(path) { return schema.virtuals[path]; };
       this.$__ = {};
     };
     Stub.prototype = Object.create(mongoose.Document.prototype);

test/index.test.js

@@ -215,7 +215,7 @@ describe('mongoose module:', function() {
 
     mongoose.set('toJSON', { virtuals: true });
 
-    const schema = new Schema({});
+    const schema = new mongoose.Schema({});
     schema.virtual('foo').get(() => 42);
     const M = mongoose.model('Test', schema);
 
@@ -225,7 +225,7 @@ describe('mongoose module:', function() {
 
     assert.equal(doc.toJSON({ virtuals: false }).foo, void 0);
 
-    const schema2 = new Schema({}, { toJSON: { virtuals: true } });
+    const schema2 = new mongoose.Schema({}, { toJSON: { virtuals: true } });
     schema2.virtual('foo').get(() => 'bar');
     const M2 = mongoose.model('Test2', schema2);
 
@@ -239,7 +239,7 @@ describe('mongoose module:', function() {
 
     mongoose.set('toObject', { virtuals: true });
 
-    const schema = new Schema({});
+    const schema = new mongoose.Schema({});
     schema.virtual('foo').get(() => 42);
     const M = mongoose.model('Test', schema);
 

test/model.test.js

@@ -7445,7 +7445,7 @@ describe('Model', function() {
   });
 
   it('supports recompiling model with new schema additions (gh-14296)', function() {
-    const schema = new mongoose.Schema({ field: String });
+    const schema = new mongoose.Schema({ field: String }, { toObject: { virtuals: false } });
     const TestModel = db.model('Test', schema);
     TestModel.schema.virtual('myVirtual').get(function() {
       return this.field + ' from myVirtual';
@@ -7455,6 +7455,12 @@ describe('Model', function() {
 
     TestModel.recompileSchema();
     assert.equal(doc.myVirtual, 'Hello from myVirtual');
+    assert.strictEqual(doc.toObject().myVirtual, undefined);
+
+    doc.schema.options.toObject.virtuals = true;
+    TestModel.recompileSchema();
+    assert.equal(doc.myVirtual, 'Hello from myVirtual');
+    assert.equal(doc.toObject().myVirtual, 'Hello from myVirtual');
   });
 
   it('supports recompiling model with new discriminators (gh-14444) (gh-14296)', function() {