ready for review

Author: aditi-khare-mongoDB

index.js

@@ -46,6 +46,7 @@ module.exports.Decimal128 = mongoose.Decimal128;
 module.exports.Mixed = mongoose.Mixed;
 module.exports.Date = mongoose.Date;
 module.exports.Number = mongoose.Number;
+module.exports.Double = mongoose.Double;
 module.exports.Error = mongoose.Error;
 module.exports.MongooseError = mongoose.MongooseError;
 module.exports.now = mongoose.now;

lib/mongoose.js

@@ -1167,6 +1167,19 @@ Mongoose.prototype.Mixed = SchemaTypes.Mixed;
 
 Mongoose.prototype.Date = SchemaTypes.Date;
 
+/**
+ * The Mongoose Double [SchemaType](https://mongoosejs.com/docs/schematypes.html). Used for
+ * declaring paths in your schema that should be 64-bit IEEE 754-2008 floating points.
+ *
+ * #### Example:
+ *
+ *     const vehicleSchema = new Car({ gasLevel: mongoose.Double });
+ *
+ * @property Double
+ * @api public
+ */
+Mongoose.prototype.Double = SchemaTypes.Double;
+
 /**
  * The Mongoose Number [SchemaType](https://mongoosejs.com/docs/schematypes.html). Used for
  * declaring paths in your schema that Mongoose should cast to numbers.

lib/schema.js

@@ -2848,6 +2848,7 @@ module.exports = exports = Schema;
  * - [Mixed](https://mongoosejs.com/docs/schematypes.html#mixed)
  * - [UUID](https://mongoosejs.com/docs/schematypes.html#uuid)
  * - [BigInt](https://mongoosejs.com/docs/schematypes.html#bigint)
+ * - [Double] (https://mongoosejs.com/docs/schematypes.html#double)
  *
  * Using this exposed access to the `Mixed` SchemaType, we can use them in our schema.
  *

lib/schema/double.js

@@ -0,0 +1,212 @@
+'use strict';
+
+/*!
+ * Module dependencies.
+ */
+
+const CastError = require('../error/cast');
+const SchemaType = require('../schemaType');
+const castDouble = require('../cast/double');
+
+/**
+ * Double SchemaType constructor.
+ *
+ * @param {String} path
+ * @param {Object} options
+ * @inherits SchemaType
+ * @api public
+ */
+
+function SchemaDouble(path, options) {
+  SchemaType.call(this, path, options, 'Double');
+}
+
+/**
+ * This schema type's name, to defend against minifiers that mangle
+ * function names.
+ *
+ * @api public
+ */
+SchemaDouble.schemaName = 'Double';
+
+SchemaDouble.defaultOptions = {};
+
+/*!
+ * Inherits from SchemaType.
+ */
+SchemaDouble.prototype = Object.create(SchemaType.prototype);
+SchemaDouble.prototype.constructor = SchemaDouble;
+
+/*!
+ * ignore
+ */
+
+SchemaDouble._cast = castDouble;
+
+/**
+ * Sets a default option for all Double instances.
+ *
+ * #### Example:
+ *
+ *     // Make all Double fields required by default
+ *     mongoose.Schema.Double.set('required', true);
+ *
+ * @param {String} option The option you'd like to set the value for
+ * @param {Any} value value for option
+ * @return {undefined}
+ * @function set
+ * @static
+ * @api public
+ */
+
+SchemaDouble.set = SchemaType.set;
+
+SchemaDouble.setters = [];
+
+/**
+ * Attaches a getter for all Double instances
+ *
+ * #### Example:
+ *
+ *     // Converts Double to be a represent milliseconds upon access
+ *     mongoose.Schema.Double.get(v => v == null ? '0.000 ms' : v.toString() + ' ms');
+ *
+ * @param {Function} getter
+ * @return {this}
+ * @function get
+ * @static
+ * @api public
+ */
+
+SchemaDouble.get = SchemaType.get;
+
+/*!
+ * ignore
+ */
+
+SchemaDouble._defaultCaster = v => {
+  if (v != null) {
+    if (typeof v !== 'number') {
+      throw new Error();
+    }
+  }
+
+  return v;
+};
+
+/**
+ * Get/set the function used to cast arbitrary values to  IEEE 754-2008 floating points
+ *
+ * #### Example:
+ *
+ *     // Make Mongoose cast any NaNs to 0
+ *     const defaultCast = mongoose.Schema.Types.Double.cast();
+ *     mongoose.Schema.Types.Double.cast(v => {
+ *       if (isNaN(v)) {
+ *         return 0;
+ *       }
+ *       return defaultCast(v);
+ *     });
+ *
+ *     // Or disable casting for Doubles entirely (only JS numbers are permitted)
+ *     mongoose.Schema.Double.cast(false);
+ *
+ *
+ * @param {Function} caster
+ * @return {Function}
+ * @function get
+ * @static
+ * @api public
+ */
+
+SchemaDouble.cast = function cast(caster) {
+  if (arguments.length === 0) {
+    return this._cast;
+  }
+  if (caster === false) {
+    caster = this._defaultCaster;
+  }
+
+  this._cast = caster;
+
+  return this._cast;
+};
+
+
+/*!
+ * ignore
+ */
+
+SchemaDouble._checkRequired = v => v != null;
+/**
+ * Override the function the required validator uses to check whether a value
+ * passes the `required` check.
+ *
+ * @param {Function} fn
+ * @return {Function}
+ * @function checkRequired
+ * @static
+ * @api public
+ */
+
+SchemaDouble.checkRequired = SchemaType.checkRequired;
+
+/**
+ * Check if the given value satisfies a required validator.
+ *
+ * @param {Any} value
+ * @return {Boolean}
+ * @api public
+ */
+
+SchemaDouble.prototype.checkRequired = function(value) {
+  return this.constructor._checkRequired(value);
+};
+
+/**
+ * Casts to Double
+ *
+ * @param {Object} value
+ * @param {Object} model this value is optional
+ * @api private
+ */
+
+SchemaDouble.prototype.cast = function(value) {
+  let castDouble;
+  if (typeof this._castFunction === 'function') {
+    castDouble = this._castFunction;
+  } else if (typeof this.constructor.cast === 'function') {
+    castDouble = this.constructor.cast();
+  } else {
+    castDouble = SchemaDouble.cast();
+  }
+
+  try {
+    return castDouble(value);
+  } catch (error) {
+    throw new CastError('Double', value, this.path, error, this);
+  }
+};
+
+/*!
+ * ignore
+ */
+
+function handleSingle(val) {
+  return this.cast(val);
+}
+
+SchemaDouble.prototype.$conditionalHandlers = {
+  ...SchemaType.prototype.$conditionalHandlers,
+  $gt: handleSingle,
+  $gte: handleSingle,
+  $lt: handleSingle,
+  $lte: handleSingle
+};
+
+
+/*!
+ * Module exports.
+ */
+
+module.exports = SchemaDouble;

lib/schema/index.js

@@ -19,6 +19,7 @@ exports.ObjectId = require('./objectId');
 exports.String = require('./string');
 exports.Subdocument = require('./subdocument');
 exports.UUID = require('./uuid');
+exports.Double = require('./double');
 
 // alias