Added HasGeometryScropes trait and a sample implementation of within

src/Eloquent/HasGeometryScopes.php

@@ -0,0 +1,18 @@
+<?php 
+namespace Phaza\LaravelPostgis\Eloquent;
+
+trait HasGeometryScopes
+{
+    public function scopeWithin($query, $geometryColumn, $geometry)
+    {   
+        // SQL syntax:  "ST_Within(geometry A, geometry B)"
+        // Example:     "ST_Within(point::geometry, ST_GeomFromText('POLYGON ((30 10, 20 40, 10 20, 30 10))', 4326 ))"
+
+        // Preparing parts
+        $geometryA = $geometryColumn . "::geometry"; 
+        $geometryB = "ST_GeomFromText('" . $geometry->toWKT() . "', " . $this->postgisTypes[$geometryColumn]['srid'] . ")";
+
+        // Assumption is made that geometry A and geometry B has the same SRID
+        return $query->whereRaw("ST_Within(" . $geometryA . "," . $geometryB . ")");        
+    }
+}

src/Eloquent/PostgisTrait.php

@@ -2,6 +2,7 @@
 
 use Illuminate\Database\Eloquent\Builder as EloquentBuilder;
 use Illuminate\Support\Arr;
+use Phaza\LaravelPostgis\Eloquent\HasGeometryScopes;
 use Phaza\LaravelPostgis\Exceptions\PostgisFieldsNotDefinedException;
 use Phaza\LaravelPostgis\Exceptions\PostgisTypesMalformedException;
 use Phaza\LaravelPostgis\Exceptions\UnsupportedGeomtypeException;
@@ -11,7 +12,8 @@
 
 trait PostgisTrait
 {
-
+    use HasGeometryScopes;
+
     public $geometries = [];
     /**
      * Create a new Eloquent query builder for the model.