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Drupal 8 Module Development by Daniel Sipos

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Fields

Now that we have an idea of what entities are, let's take a look at how data is actually stored on these entities.

I have alluded in the preceding section to how certain entity bundles can have various fields. This means that each entity type bundle can have any number of fields that are responsible for holding data. Additionally, each entity type itself can have fields for storing data. Okay, but what? Let's break this down.

There are two types of Fields in Drupal 8--base fields and configurable fields. The former are fields that are defined in the code for each entity type you define (or alter), whereas the latter are usually created and configured in the UI and attached to a bundle of that entity type and exported via configuration. ...

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