to build (parts of) a fake ORM with a non-persistent data store

Create a class named Model that will be used as our mixin. All classes that extend Model becomes a "model" and inherits all of it's capabilities.

Create a pseudo "Data Store" class that acts as storage for each "Model".

Create 4 sample classes to test the inherited behaviors of a "Model".

Once the Data Store and Model is setup correctly, then each Class extends the Model properly, then all tests will pass.

Create all class files in the lib/ subdirectory.

npm install

npm test

Is a class that has a single public property named store.

Export an instance of the Data Store class as a module.

Will require the Data Store module, and assign it's store property to a temporary variable.

Define a constructor that accepts a singl argument schema and assign it's value to a public property named schema. The constructor sets a public property named id set to null. The constructor sets a new public property for each key in schema, using the same name as the key, and set to an initial value of null.

The constructor sets a new default value of an empty array in the datastore using the constructor's name as the key, if that key does not already exist in the datastore.

Defines the behaviors of instances of classes that inherit from Model.

should have a method named save that sets it's id to the next id in this model's datastore, if this object's id is null

should have a method named destroy that removes the stored data object from the datastore for this model, if it has an id set

should have a method named getNextId that returns the next successive number in the datastore for this model, the highest id plus one.

should have a method named find that accepts a single argument id that returns the stored data object in the datastore for this model, having the same id value passed in from the find argument

should have a method named extend that accepts a single argument klass, and extends each static and prototype method of Model onto klass

Will require the Model module, and assign it to a temporary variable.

Will declare a new variable named UserSchema and assign it's value to a literal object with the following keys and values

username = String password = String

The constructor will call the Model constructor method using this as it's context, and UserSchema as it's only argument.

After the class constructor, invoke the Model.extend static method passing in a single argument User.

export the User class definition as a module.

Will require the Model module, and assign it to a temporary variable. Will require the User module, and assign it to a temporary variable.

Will declare a new variable named AccountSchema and assign it's value to a literal object with the following keys and values

user = User accountNumber = Number address = String balance = Number

The constructor will call the Model constructor method using this as it's context, and AccountSchema as it's only argument.

After the class constructor, invoke the Model.extend static method passing in a single argument Account.

export the Account class definition as a module.

Will require the Model module, and assign it to a temporary variable. Will require the User module, and assign it to a temporary variable.

Will declare a new variable named MessageSchema and assign it's value to a literal object with the following keys and values

from = User to = User message = String sent = Date

The constructor will call the Model constructor method using this as it's context, and MessageSchema as it's only argument.

After the class constructor, invoke the Model.extend static method passing in a single argument Message.

export the Message class definition as a module.

Will require the Model module, and assign it to a temporary variable.

Will declare a new variable named LocationSchema and assign it's value to a literal object with the following keys and values

lng = Number lat = Number

The constructor will call the Model constructor method using this as it's context, and LocationSchema as it's only argument.

After the class constructor, invoke the Model.extend static method passing in a single argument Location.

export the Location class definition as a module.