Add support for naming additional database connections

src/Illuminate/Database/DatabaseManager.php

@@ -91,7 +91,7 @@ public function __construct($app, ConnectionFactory $factory)
      */
     public function connection($name = null)
     {
-        $name = $name ?: $this->getDefaultConnection();
+        $name = $this->mapConnectionName($name);
 
         [$database, $type] = $this->parseConnectionName($name);
 
@@ -166,6 +166,19 @@ public function connectUsing(string $name, array $config, bool $force = false)
         return tap($connection, fn ($connection) => $this->connections[$name] = $connection);
     }
 
+    /**
+     * Map the given connection name to its configuration name or default if not provided.
+     *
+     * @param  string  $name
+     * @return string
+     */
+    protected function mapConnectionName($name)
+    {
+        $name = $name ?: $this->getDefaultConnection();
+
+        return $this->app['config']['database.' . $name] ??= $name;
+    }
+
     /**
      * Parse the connection into an array of the name and read / write type.
      *
@@ -174,7 +187,7 @@ public function connectUsing(string $name, array $config, bool $force = false)
      */
     protected function parseConnectionName($name)
     {
-        $name = $name ?: $this->getDefaultConnection();
+        $name = $this->mapConnectionName($name);
 
         return Str::endsWith($name, ['::read', '::write'])
                             ? explode('::', $name, 2) : [$name, null];
@@ -217,7 +230,7 @@ protected function makeConnection($name)
      */
     protected function configuration($name)
     {
-        $name = $name ?: $this->getDefaultConnection();
+        $name = $this->mapConnectionName($name);
 
         $connections = $this->app['config']['database.connections'];
 
@@ -304,7 +317,7 @@ protected function setPdoForType(Connection $connection, $type = null)
      */
     public function purge($name = null)
     {
-        $name = $name ?: $this->getDefaultConnection();
+        $name = $this->mapConnectionName($name);
 
         $this->disconnect($name);