Changing Contentful tags
I added a Specials column to the top page that narrows things down to categories that are personally hot for me. Each article can have multiple categories in the form of tags. Since I changed how tags are used to make this happen, I am writing a note about it.
This site uses Contentful as its CMS. Contentful has a feature that lets you freely create content types, so you can build fairly flexible article data.
Tags were also built using this content type system, called content models in Contentful, and they had a many-to-many structure.
When building the Specials column, I wanted to extract and display only articles with multiple specific tags, but that was not so easy. Reading the documentation, it seems that filtering many-to-many entries with the filtering feature is not possible.
Of course, it is not enough to only narrow down entries; I also need to exclude anything other than the relevant tags. And if filtering itself cannot be done, exclusions are even less possible.
Actually, Contentful provides a standard feature that works like tags. Personally, I had wanted to express various data relationships using content models, but I found that filtering is possible when using the built-in tags. They probably have a special data structure. I regret not using the standard feature from the beginning. At first, I had ambitions like attaching various metadata to tags.
By registering all existing Tags model entries as standard tags and reassigning the tags on existing articles, I was able to filter them. The tags on the article you are currently viewing have not changed visually at all, but the data structure has become completely different.