Taxonomy Relationships

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I’ve created two taxonomies:

  • Make
  • Model

This is for a CPT Vehicles. It goes without saying, Make would be your make (Honda / Toyota / Ford / etc) and then one would select the Model based on the Make.

How do I setup the relationship between Make and Model? Or have I gone about this all wrong and it should in fact be a single taxonomy ‘Make & Model’?

Im not looking for:

Vehicle CPT
 |-> Make
 |-> Model

Im looking for:

Vehicle CPT
 |-> Make
      |--> Model

2 Answers
2

Taxonomies are not child of each other unlike terms, which can be. Take a look at this flowchart:

Taxonomy relationship

Model is a child of Make, and should not be registered as a new taxonomy. What you are trying to do, is something like setting Ford as a child of Honda, which is not right. Instead, register 1 single Make taxonomy, and then create sub-taxonomies, just like what we do in categories.

Take a look at register_taxonomy() function at the codex, and register your taxonomy as hierarchical, then create sub taxonomies as model.

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