MAGETWO-74021: "Catalog Products List" widget does not displays on frontend

Author: victor-v-rad

app/code/Magento/Catalog/Model/ResourceModel/Product/Collection.php

@@ -1060,14 +1060,15 @@ public function getAllAttributeValues($attribute)
         $select = clone $this->getSelect();
         $attribute = $this->getEntity()->getAttribute($attribute);
 
-        $aiField = $this->getConnection()->getAutoIncrementField($this->getMainTable());
+        $fieldMainTable = $this->getConnection()->getAutoIncrementField($this->getMainTable());
+        $fieldJoinTable = $attribute->getEntity()->getLinkField();
         $select->reset()
             ->from(
                 ['cpe' => $this->getMainTable()],
                 ['entity_id']
             )->join(
                 ['cpa' => $attribute->getBackend()->getTable()],
-                'cpe.' . $aiField . ' = cpa.' . $aiField,
+                'cpe.' . $fieldMainTable . ' = cpa.' . $fieldJoinTable,
                 ['store_id', 'value']
             )->where('attribute_id = ?', (int)$attribute->getId());
 

dev/tests/integration/testsuite/Magento/CatalogWidget/Block/Product/ProductListTest.php

@@ -115,6 +115,9 @@ public function testCreateCollectionWithDropdownAttributeStoreScope()
             . $dropdownAttributeOptionIds[1] . '`^]^]';
         $this->block->setData('conditions_encoded', $encodedConditions);
         $this->performAssertions(2);
+        $attribute->setUsedInProductListing(0);
+        $attribute->save();
+        $this->performAssertions(2);
     }
 
     /**