Challenge: Model Validations

Work through a challenge to test your understanding of validations.

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Problem statement
Implementation

Problem statement

In this challenge, you have to make changes to the model code of your application to do the following:

Add a check function that validates the constraints defined for the property, and a setter method that invokes the check function and will be used for setting the value of the property.
Perform validation before any data is saved in the add and update methods.

You’ll be using the Movie App introduced in the previous challenge. You can make the assumption that all the data can be kept in the main memory. Persistent data storage is implemented with JavaScript’s Local Storage API.

The application deals with just one object type, Movie, as depicted in the following class diagram:

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Introduction

The Foundations of Web Apps

Javascript Fundamentals

Building a Minimal Web App with Plain JS in Seven Steps

Integrity Constraints and Data Validation

Constraint Validation in Plain JS

Enumerations

Enumeration Attributes in Plain JS

Reference Properties and Unidirectional Associations

Implementing Unidirectional Functional Associations

Implementing Unidirectional Non-Functional Associations

Bidirectional Associations

Implementing Bidirectional Associations

Subtyping and Inheritance

Subtyping with Plain JS

Conclusion

Challenge: Model Validations

Problem statement