Скачать или смотреть Troubleshooting Postgres: Fixing VARCHAR Display Issues in Your HTML Table

Discover how to resolve issues with `VARCHAR` fields not displaying in HTML tables when migrating a Node/Express application from MongoDB to PostgreSQL.
---
This video is based on the question https://stackoverflow.com/q/71560774/ asked by the user 'JustReflektor' ( https://stackoverflow.com/u/6052374/ ) and on the answer https://stackoverflow.com/a/71601412/ provided by the user 'JustReflektor' ( https://stackoverflow.com/u/6052374/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Postgres VARCHAR not displaying in html table

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Introducing the Problem

Moving an application from a database like MongoDB to PostgreSQL can introduce a host of challenges, especially when it comes to data types and rendering on the front end. One common issue is when your VARCHAR fields, which hold important Boolean values ("True" or "False"), fail to display correctly in HTML tables.

This guide will walk you through a specific case where pipeline.firstItem and pipeline.secondItem are not showing up in an EJS template, despite those values being saved successfully in the PostgreSQL database.

Understanding the Context

Imagine you have a Node.js application utilizing Express and EJS for rendering views. You've successfully saved values to the PostgreSQL database, and everything works as expected when you query the database from the SQL shell. But as soon as you attempt to display firstItem and secondItem in your HTML table, they simply don't show up.

Here's the key part of the relevant HTML structure that's causing confusion:

[[See Video to Reveal this Text or Code Snippet]]

Analyzing the Solution

Through investigation and careful examination of the code, we can find out why pipeline.firstItem and pipeline.secondItem are not displaying correctly.

Key Issue: Case Sensitivity

Case Sensitivity in JavaScript:

One of the fundamental aspects of JavaScript (and many programming languages) is that variable names are case-sensitive.

In your case, it looks like you had defined the values as firstitem and seconditem with lowercase "i" in other parts of your code.

How to Fix It:

Simply ensure that you maintain a consistent case throughout. Change your code references from pipeline.firstItem to pipeline.firstitem (and similarly for secondItem).

Code Adjustment

To resolve the issue, follow these simple adjustments:

[[See Video to Reveal this Text or Code Snippet]]

And in your EJS template:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

When migrating from MongoDB to PostgreSQL, don't overlook the smaller details like variable naming conventions. Issues like case sensitivity can easily lead to frustrating bugs that hinder your application's functionality. By being consistent with your variable naming, you can ensure your data is properly displayed in your HTML elements.

If you find that data is not appearing as expected, always check naming discrepancies as part of your debugging process. With a few simple adjustments, your application should accurately reflect the data stored in your PostgreSQL database.

Whether you're just starting out or are a seasoned developer, remember that solving these small issues can make a significant difference in optimizing your application!