Figure 2. Error messages when trying to save an event

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Conclusion
Through the article we had the opportunity to learn about Ruby on Rails and how we can quickly create a functional prototype. This exercise also allowed us to learn about the convention that Rails uses and that helps us avoid making decisions about the application architecture, allowing us to quickly focus on what provides value to our users.

This example has only touched on the most basic topics of Rails, there is still much more to learn in order to develop applications “the Rails way” and achieve applications that meet the needs of users and are maintainable at the same time.

Rails currently has a very active community of individuals and companies that are betting on this way of making web applications. Rails has also been an example to follow in other programming languages, and today we can UAE Mobile Database find frameworks similar to or modeled after Rails in languages ​​such as Python, PHP, Java and .NET.Since May 2004, the Tax Administration Service (SAT) has approved electronic invoicing as a fiscal verification scheme. The electronic invoice or Digital Tax Certificate via Internet (CFDI) is used by the buyer and the seller as proof before the authorities and in internal audits.

Annex 20 of the tax code specifies the standard for correctly creating a digital invoice, which is an XML document that is made up of the data of the invoice issuer, the invoice recipient, the concepts and taxes, in addition to the possibility of integrating information fields useful for your internal systems. Said data can be integrated thanks to the addenda node.

This article presents a general analysis of the existing electronic invoicing scheme in Mexico, and then proposes a system that can extend the current one and try to improve the identified areas of opportunity.