add support for filter expression

src/Adapter/AdapterInterface.php

@@ -50,6 +50,13 @@ interface AdapterInterface
      */
     public function filterByRelationship($query, Relationship $relationship, Closure $scope): void;
 
+    /**
+     * Manipulate the query to only include resources appropriate to given filter expression.
+     *
+     * @param string $expression The filter expression
+     */
+    public function filterByExpression($query, string $expression): void;
+
     /**
      * Manipulate the query to sort by the given attribute in the given direction.
      */

src/Adapter/EloquentAdapter.php

@@ -61,6 +61,10 @@ class EloquentAdapter implements AdapterInterface
         $query->whereHas($this->getRelationshipProperty($relationship), $scope);
     }
 
+    public function filterByExpression($query, string $expression): void
+    {
+    }
+
     public function sortByAttribute($query, Attribute $attribute, string $direction): void
     {
         $query->orderBy($this->getAttributeProperty($attribute), $direction);

src/Adapter/NullAdapter.php

@@ -27,6 +27,10 @@ class NullAdapter implements AdapterInterface
     {
     }
 
+    public function filterByExpression($query, string $expression): void
+    {
+    }
+
     public function sortByAttribute($query, Attribute $attribute, string $direction): void
     {
     }

src/ResourceType.php

@@ -122,6 +122,11 @@ final class ResourceType
                 continue;
             }
 
+            if (is_int($name)) {
+                $this->adapter->filterByExpression($query, $value);
+                continue;
+            }
+
             if (
                 isset($customFilters[$name])
                 && evaluate($customFilters[$name]->getVisible(), [$context])