In the Simple product type documentation, we added a custom field to a product variation type, to allow product variations to have images. In the Product type with attributes documentation, we added a custom field to a product attribute, to allow a Color attribute to be displayed as a color swatch image instead of just the color name. In this section, we're going to look at how to add fields to product types so that we can organize products into categories that can be used for the product catalog.
Let's start by creating a Brands taxonomy to organize products by brand.
For our product catalog, we're also going to want to hierarchical categories so that customers can use faceted search to "drill down" to specific categories. For example, on the Commerce Demo site, we have an Urban Living product category with sub-categories of Food & Beverage, Home, Outdoors, etc. And within the Home category, we further classify products as Accessories, Kitchen, Office, or Furnishings.
To create a hierarchical taxonomy in Drupal, we can use the same steps we used to create a basic taxonomy. After creating a Product categories taxonomy and adding the terms, we have a listing that looks like this:
Notice that the Accessories term appears to be duplicated, but that's fine, since one of those terms will be a sub-category of the Urban Living Home category, and the other will be a sub-category of the Urban Living Outdoors category. They have the same label but are actually two completely separate terms.
To transform this simple listing into a hierarchical taxonomy, you just need to use the drag-and-drop icons in the leftmost column to rearrange the terms. You may also find it helpful to click the Show row weights link to set the order of terms within a particular category, especially if there are a great number of items. After moving items around, the Product categories taxonomy now looks like this and all we need to do is click the Save button to save the changes:
Let's add a field that references our Brands taxonomy to the Simple product type we previously created. (If you haven't created the Simple product type, you can use Default or any other product type.)
The Brand field has now been added to the Simple product type. To add the Brand field to another product type, you can Re-use an existing field to select this Brand field on the Add field page for the product type.
We can also create a new Taxonomy term reference field for our Product categories taxonomy and any other product taxonomies we want to create. Unlike the Brand field, which was limited to a single value, we'll specify Unlimited for the Allowed number of values for product categories:
To learn how to use the Brand and Taxonomy in a faceted product catalog, see the Product catalog with facets documentation.
In the next section, we'll look at options for product architectures in Drupal Commerce.
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