Added 5.6 changes

Author: maguilar92

README.md

@@ -3,6 +3,13 @@
 # Laravel Cross database subqueries
 Eloquent cross database compatibility in subqueries.
 
+| **Laravel**  |  **laravel-cross-database-subqueries** |  **Lifecycle** |
+|---|---|---|
+| ^5.5  | ^5.5  | January 24, 2017 |
+||| Bug fixes until January 2019 |
+||| Security fixes until June 2020 |
+
+
 # Why do I need it?
 ### To use the following Eloquent methods cross databases:
 * has

src/Eloquent/Concerns/QueriesRelationships.php

@@ -28,7 +28,7 @@ protected function addHasWhere(Builder $hasQuery, Relation $relation, $operator,
             $subqueryConnection = $hasQuery->getConnection()->getDatabaseName();
             $queryConnection = $this->getConnection()->getDatabaseName();
             if ($queryConnection != $subqueryConnection) {
-                $queryFrom = $hasQuery->getQuery()->from.'<-->'.$subqueryConnection;
+                $queryFrom = $hasQuery->getConnection()->getTablePrefix().'<-->'.$hasQuery->getQuery()->from.'<-->'.$subqueryConnection;
                 $hasQuery->from($queryFrom);
             }
         }
@@ -78,25 +78,29 @@ public function withCount($relations)
 
             $query->callScope($constraints);
 
-            $query->mergeConstraintsFrom($relation->getQuery());
-
             // If connection implements CanCrossDatabaseShazaamInterface we must attach database
             // connection name in from to be used by grammar when query compiled
             if ($this->getConnection() instanceof CanCrossDatabaseShazaamInterface) {
                 $subqueryConnection = $query->getConnection()->getDatabaseName();
                 $queryConnection = $this->getConnection()->getDatabaseName();
                 if ($queryConnection != $subqueryConnection) {
-                    $queryFrom = $query->getQuery()->from.'<-->'.$subqueryConnection;
+                    $queryFrom = $query->getConnection()->getTablePrefix().'<-->'.$query->getQuery()->from.'<-->'.$subqueryConnection;
                     $query->from($queryFrom);
                 }
             }
 
+            $query = $query->mergeConstraintsFrom($relation->getQuery())->toBase();
+
+            if (count($query->columns) > 1) {
+                $query->columns = [$query->columns[0]];
+            }
+
             // Finally we will add the proper result column alias to the query and run the subselect
             // statement against the query builder. Then we will return the builder instance back
             // to the developer for further constraint chaining that needs to take place on it.
             $column = $alias ?? Str::snake($name.'_count');
 
-            $this->selectSub($query->toBase(), $column);
+            $this->selectSub($query, $column);
         }
 
         return $this;

src/Query/Grammars/MySqlGrammar.php

@@ -19,9 +19,14 @@ protected function compileFrom(Builder $query, $table)
     {
         // Check for cross database query to attach database name
         if (strpos($table, '<-->') !== false) {
-            list($table, $database) = explode('<-->', $table);
+            list($prefix, $table, $database) = explode('<-->', $table);
+            $wrappedTable = $this->wrapTable($table, true);
+            $wrappedTablePrefixed = $this->wrap($prefix.$table, true);
+            if ($wrappedTable != $wrappedTablePrefixed) {
+                return 'from '.$this->wrap($database).'.'.$wrappedTablePrefixed.' as '.$wrappedTable;
+            }
 
-            return 'from '.$this->wrap($database).'.'.$this->wrapTable($table);
+            return 'from '.$this->wrap($database).'.'.$wrappedTablePrefixed;
         }
 
         return 'from '.$this->wrapTable($table);

src/Query/Grammars/PostgresGrammar.php

@@ -19,9 +19,14 @@ protected function compileFrom(Builder $query, $table)
     {
         // Check for cross database query to attach database name
         if (strpos($table, '<-->') !== false) {
-            list($table, $database) = explode('<-->', $table);
+            list($prefix, $table, $database) = explode('<-->', $table);
+            $wrappedTable = $this->wrapTable($table, true);
+            $wrappedTablePrefixed = $this->wrap($prefix.$table, true);
+            if ($wrappedTable != $wrappedTablePrefixed) {
+                return 'from '.$this->wrap($database).'.'.$wrappedTablePrefixed.' as '.$wrappedTable;
+            }
 
-            return 'from '.$this->wrap($database).'.'.$this->wrapTable($table);
+            return 'from '.$this->wrap($database).'.'.$wrappedTablePrefixed;
         }
 
         return 'from '.$this->wrapTable($table);

src/Query/Grammars/SqlServerGrammar.php

@@ -18,10 +18,16 @@ class SqlServerGrammar extends IlluminateSqlServerGrammar
     protected function compileFrom(Builder $query, $table)
     {
         $from = 'from '.$this->wrapTable($table);
+
         // Check for cross database query to attach database name
         if (strpos($table, '<-->') !== false) {
-            list($table, $database) = explode('<-->', $table);
-            $from = 'from '.$this->wrap($database).'.'.$this->wrapTable($table);
+            list($prefix, $table, $database) = explode('<-->', $table);
+            $wrappedTable = $this->wrapTable($table, true);
+            $wrappedTablePrefixed = $this->wrap($prefix.$table, true);
+            $from = 'from '.$this->wrap($database).'.'.$wrappedTablePrefixed;
+            if ($wrappedTable != $wrappedTablePrefixed) {
+                $from = 'from '.$this->wrap($database).'.'.$wrappedTablePrefixed.' as '.$wrappedTable;
+            }
         }
 
         if (is_string($query->lock)) {