Add QueryCacheModule::appendCacheTags and Builder::selectSub

Author: giannicic

src/Query/Builder.php

@@ -33,4 +33,22 @@ public function useWritePdo()
 
         return $this;
     }
+
+    /**
+     * Add a subselect expression to the query.
+     *
+     * @param  \Closure|$this|string  $query
+     * @param  string  $as
+     * @return $this
+     *
+     * @throws \InvalidArgumentException
+     */
+    public function selectSub($query, $as)
+    {
+        if(get_class($query) == self::class) {
+            $this->appendCacheTags($query->getCacheTags() ?? []);
+        }
+
+        return parent::selectSub($query, $as);
+    }
 }

src/Traits/QueryCacheModule.php

@@ -272,6 +272,19 @@ public function cacheTags(array $cacheTags = [])
         return $this;
     }
 
+    /**
+     * Append tags to the cache.
+     *
+     * @param  array  $cacheTags
+     * @return \Rennokki\QueryCache\Query\Builder
+     */
+    public function appendCacheTags(array $cacheTags = [])
+    {
+        $this->cacheTags = array_unique(array_merge($this->cacheTags ?? [], $cacheTags));
+
+        return $this;
+    }
+
     /**
      * Use a specific cache driver.
      *