Refactor hook_farm_metrics to use a 'key' to identify arrays of metrics.

Without this, the 'farm_metrics.json' endpoint returns an array indexed by element ID, which would be more difficult for consumers of the 'farm_metrics.json' API to parse.

modules/farm/farm_area/farm_area.farm_metrics.inc

@@ -15,7 +15,7 @@ function farm_area_farm_metrics() {
   // Count the number of areas.
   $areas = db_query("SELECT COUNT(tid) FROM {taxonomy_term_data} t LEFT JOIN {taxonomy_vocabulary} v ON t.vid = v.vid WHERE v.machine_name = 'farm_areas'")->fetchField();
   if (!empty($areas)) {
-    $metrics[] = array(
+    $metrics['areas'] = array(
       'label' => t('Areas'),
       'value' => $areas,
       'link' => 'farm/areas',
@@ -51,7 +51,7 @@ function farm_area_farm_metrics() {
     }
 
     // Add a metric.
-    $metrics[] = array(
+    $metrics[$area_type] = array(
       'label' => t('@area_type area', array('@area_type' => $label)),
       'value' => $total_area,
       'link' => 'farm/areas',

modules/farm/farm_metrics/farm_metrics.api.php

@@ -25,22 +25,25 @@
  * Defines farm metrics.
  *
  * @return array
- *   Returns an array of metrics. Each should
- *   be an array containing the following keys:
+ *   Returns an array of farm metrics. The key should be a unique metric
+ *   name, and each should be an array of metric values including the
+ *   following keys:
  *     - label: Translated metric label.
  *     - value: The metric's value.
  *     - link: A path to link the value to.
  *     - weight: Weight for ordering (optional - defaults to alphabetical).
  */
 function hook_farm_metrics() {
-  return array(
-    array(
-      'label' => t('Example'),
-      'value' => '100',
-      'link' => 'farm/example',
-      'weight' => -10,
-    ),
+  $metrics = array();
+
+  $metrics['example'] = array(
+    'label' => t('Example'),
+    'value' => '100',
+    'link' => 'farm/example',
+    'weight' => -10,
   );
+
+  return $metrics;
 }
 
 /**

modules/farm/farm_ui/farm_ui.farm_metrics.inc

@@ -35,7 +35,7 @@ function farm_ui_farm_metrics() {
     }
 
     // Build a metric.
-    $metrics[] = array(
+    $metrics[$type] = array(
       'label' => $info['label_plural'],
       'value' => $count,
       'link' => farm_ui_view_page_path($info['view']),