Fetch Entity by property won't work for all properties

having the same problem here:

my rule with an entity query for a taxonomy_vocabulary by machine name

        { "entity_query" : {
            "USING" : {
              "type" : "taxonomy_vocabulary",
              "property" : "machine_name",
              "value" : "update_tags",
              "limit" : "1"
            },

leads to

Warning: array_values() [function.array-values]: The argument should be an array in rules_action_entity_query() (line 97 of .../modules/rules/modules/data.eval.in

debugging into the stated function

/**
 * Action: Query entities.
 */
function rules_action_entity_query($type, $property, $value, $limit) {
  $return = entity_property_query($type, $property, $value, $limit);
  return array('entity_fetched' => array_values($return));
}

yields

  dpm($type); .> taxonomy_vocabulary
  dpm($property); -> machine_name
  dpm($value); ->update_tags
  dpm($limit); -> 1
  dpm($return); -> NULL (empty)

so, it seems the entity_property query doesn't return the expected vocabulary and rules_action_entity_query can't deal with empty results

debugging into the function, reveals that entity_property_query fails, as it is missing the query callback method for the given property.

#1093918: Improve entity property query support fixes the problem for me

Yep, apart from fixing that we need fix the Rules action to check which properties support querying. Probably best we should only add those properties in the options list.

uhm, sry the patch in #4 doesn't belong in this issue

kannary: the best way would be, if you could test fago's patch in #1093918: Improve entity property query support in order to mark it "reviewed and tested by the community"

I'm having trouble fetching an entity by a property. I have two nodes, each with a number field, both values set to the same number. On saving one node, I'm trying to use rules to look up the other node by fetching it by the number property, and using the value from the first node as the selector value. The log shows that the entity was loaded, or at least, it says that it added a variable called drupal_project_maintainer_entity_fetched for it, but that variable doesn't seem to be available for use later on (I tried printing it as a message), neither does any entity seem to have actually been loaded.

Rule Drupal project user relations fires. [edit]
0 ms Rule Drupal project user relations fires.
1.394 ms Evaluating the action entity_query. [edit]
3.731 ms Added the provided variable drupal_project_maintainer_entity_fetched of type list<node> [edit]
5.019 ms Evaluating the action variable_add. [edit]
5.189 ms Added the provided variable relation_endpoints of type list<entity> [edit]
6.341 ms Evaluating the action list_add. [edit]
6.791 ms Evaluating the action list_add. [edit]
8.125 ms Evaluating the action entity_create. [edit]
13.278 ms Added the provided variable drupal_project_maintainer_relation of type relation [edit]
20.96 ms Evaluating the action drupal_message. [edit]
26.311 ms Evaluating the action drupal_message. [edit]
30.91 ms Evaluating the action drupal_message. [edit]
31.083 ms Rule Drupal project user relations has fired.
40.842 ms Saved drupal_project_maintainer_relation of type relation.
45.445 ms Finished reacting on event After updating existing content.

One of the earlier comments in this threads hints at it not being possible to query entities on all fields. Is fetching an entity by looking up the value stored in a number field supported?

i can cofirm this issue for a Product reference (Drupal Commerce) property.

@vasike - I've had this issue on commerce product reference fields too, and I think I've found a fix. Issue here: https://drupal.org/node/1306106

for me it seems that are some conflicts with the Meta tags module. if i disable the metatags then it seems it works

i'm marking this as fixed. #1093918: Improve entity property query support has landed and i have created a follow up for handling bundle-specific properties #2058037: Support all entity properties in the entity query action.