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I'm trying to create a rule using Rules that will apply a watermark to an image within a node (using the ImageCache Actions module) if that given node has a specific Taxonomy term. For example, nodes with the term "Video" will get a play button icon over their image.

Is there a way to add taxonomy terms as a condition in Rules? It seems like it would be a simple task but I can't seem to figure it out. Does anyone know how I could do this?

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    A rule will trigger only after an event but here you do not have any event. you are having only the condition. Jan 8 '15 at 5:19
  • Could the event "before saving content" work?
    – Sam
    Jan 8 '15 at 5:32
  • may be you can try before and after both situation. Jan 8 '15 at 6:01
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    Its doable but it will be painful. Check out Conditional Rules to assist you if you need more advanced Rules logic. If I was you I would implement template_preprocess_node, check the value of the taxonomy term, and wrap image with a div that has a class on it, then style with CSS. And should you not rather try to switch out the image formatter with your Rules approach to a formatter that includes watermarking? Jan 8 '15 at 11:41
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Have a look at this, rather basic, rule (in Rules export format):

{ "rules_check_taxonomy_term" : {
    "LABEL" : "Check Taxonomy Term",
    "PLUGIN" : "reaction rule",
    "OWNER" : "rules",
    "REQUIRES" : [ "rules" ],
    "ON" : { "node_insert" : [], "node_update" : [] },
    "IF" : [
      { "entity_has_field" : { "entity" : [ "node" ], "field" : "field_tags" } },
      { "list_contains" : { "list" : [ "node:field-tags" ], "item" : "21" } }
    ],
    "DO" : [
      { "drupal_message" : { "message" : "A node containing the tag [node:field_tags] just got created or updated." } }
    ]
  }
}

Here is what this rule does:

  • Rules Event: After saving new content, After updating existing content
  • Rules Conditions:

    • Entity has field "field_tags", which is the machine name of the term reference field I want to check for.
    • List contains item "node:field-tags" and with Taxonomy term identifier value "21" (which is the term id of the term I want to check in this Rules Condition).
  • Rules Action: Show a message on the site (which is "A node containing the tag [node:field_tags] just got created or updated." (with [node:field_tags] the actual term with term id = 21).

What is crucial in the above rules example in the context of this question, are the 2 Rules Conditions.

Use the Rules UI to import the above rule in your site. Here are the tweaks you'll need to make it fit your case:

  • Replace the Rules Event (if needed).
  • Within the Rules Conditions, perform these changes:

    • replace the "node" entity with your entity.
    • replace the machine name of term reference "field_tags", and adapt the "term id" to fit your case (for the term "Video").
  • Replace the Rules Action by whatever fits your case.

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