Cleaning up foreign key support. Added drop_foreign command.

Signed-off-by: Taylor Otwell <taylorotwell@gmail.com>

laravel/database/schema/grammars/grammar.php

@@ -6,14 +6,60 @@ use Laravel\Database\Schema\Table;
 abstract class Grammar extends \Laravel\Database\Grammar {
 
 	/**
-	 * Get the appropriate data type definition for the column.
+	 * Generate the SQL statement for creating a foreign key.
 	 *
+	 * @param  Table    $table
+	 * @param  Command  $command
+	 * @return string
+	 */
+	public function foreign(Table $table, Fluent $command)
+	{
+		$name = $command->name;
+
+		// We need to wrap both of the table names in quoted identifiers to protect
+		// against any possible keyword collisions, both the table on which the
+		// command is being executed and the referenced table are wrapped.
+		$table = $this->wrap($table);
+
+		$on = $this->wrap($command->on);
+
+		// Next we need to columnize both the command table's columns as well as
+		// the columns referenced by the foreign key. We'll cast the referenced
+		// columns to an array since they aren't by the fluent command.
+		$foreign = $this->columnize($command->columns);
+
+		$referenced = $this->columnize((array) $command->references);
+
+		$sql = "ALTER TABLE $table ADD CONSTRAINT $name ";
+
+		return $sql .= "FOREIGN KEY ($foreign) REFERENCES $on ($referenced)";
+	}
+
+	/**
+	 * Drop a constraint from the table.
+	 *
+	 * @param  Table   $table
+	 * @param  Fluent  $fluent
+	 * @return string
+	 */
+	protected function drop_constraint(Table $table, Fluent $command)
+	{
+		return "ALTER TABLE ".$this->wrap($table)." DROP CONSTRAINT ".$command->name;
+	}
+
+	/**
+	 * Get the SQL syntax for indicating if a column is unsigned.
+	 *
+	 * @param  Table   $table
 	 * @param  Fluent  $column
 	 * @return string
 	 */
-	protected function type(Fluent $column)
+	protected function unsigned(Table $table, Fluent $column)
 	{
-		return $this->{'type_'.$column->type}($column);
+		if ($column->type == 'integer' && $column->unsigned)
+		{
+			return ' UNSIGNED';
+		}
 	}
 
 	/**
@@ -40,18 +86,14 @@ abstract class Grammar extends \Laravel\Database\Grammar {
 	}
 
 	/**
-	 * Get the SQL syntax for indicating if a column is unsigned.
+	 * Get the appropriate data type definition for the column.
 	 *
-	 * @param  Table   $table
 	 * @param  Fluent  $column
 	 * @return string
 	 */
-	protected function unsigned(Table $table, Fluent $column)
+	protected function type(Fluent $column)
 	{
-		if ($column->type == 'integer' && $column->unsigned)
-		{
-			return ' UNSIGNED';
-		}
+		return $this->{'type_'.$column->type}($column);
 	}
 
 }
\ No newline at end of file

laravel/database/schema/grammars/mysql.php

@@ -197,39 +197,6 @@ class MySQL extends Grammar {
 		return 'ALTER TABLE '.$this->wrap($table)." ADD {$type} {$name}({$keys})";
 	}
 
-	/**
-	 * Generate the SQL statement for creating a foreign key.
-	 *
-	 * @param  Table    $table
-	 * @param  Command  $command
-	 * @return string
-	 */
-	public function foreign(Table $table, Fluent $command)
-	{
-		$name = $command->name;
-
-		// We need to wrap both of the table names in quoted identifiers to protect
-		// against any possible keyword collisions, both the table on which the
-		// command is being executed and the referenced table are wrapped.
-		$table = $this->wrap($table);
-
-		$on = $this->wrap($command->on);
-
-		// Next we need to columnize both the command table's columns as well as
-		// the columns referenced by the foreign key. We'll cast the referenced
-		// columns to an array since they aren't by the fluent command.
-		$foreign = $this->columnize($command->columns);
-
-		$referenced = $this->columnize((array) $command->references);
-
-		// Finally we can built the SQL. This should be the same for all database
-		// platforms we support, but we'll just keep it in the grammars since
-		// adding foreign keys using ALTER isn't supported by SQLite.
-		$sql = "ALTER TABLE $table ADD CONSTRAINT $name ";
-
-		die($sql .= "FOREIGN KEY ($foreign) REFERENCES $on ($referenced)");
-	}
-
 	/**
 	 * Generate the SQL statement for a drop table command.
 	 *
@@ -325,6 +292,18 @@ class MySQL extends Grammar {
 		return 'ALTER TABLE '.$this->wrap($table)." DROP INDEX {$command->name}";
 	}
 
+	/**
+	 * Drop a foreign key constraint from the table.
+	 *
+	 * @param  Table   $table
+	 * @param  Fluent  $fluent
+	 * @return string
+	 */
+	public function drop_foreign(Table $table, Fluent $command)
+	{
+		return $this->drop_constraint($table, $command);		
+	}
+
 	/**
 	 * Generate the data-type definition for a string.
 	 *

laravel/database/schema/grammars/postgres.php

@@ -198,39 +198,6 @@ class Postgres extends Grammar {
 		return $create." INDEX {$command->name} ON ".$this->wrap($table)." ({$columns})";
 	}
 
-	/**
-	 * Generate the SQL statement for creating a foreign key.
-	 *
-	 * @param  Table    $table
-	 * @param  Command  $command
-	 * @return string
-	 */
-	public function foreign(Table $table, Fluent $command)
-	{
-		$name = $command->name;
-
-		// We need to wrap both of the table names in quoted identifiers to protect
-		// against any possible keyword collisions, both the table on which the
-		// command is being executed and the referenced table are wrapped.
-		$table = $this->wrap($table);
-
-		$on = $this->wrap($command->on);
-
-		// Next we need to columnize both the command table's columns as well as
-		// the columns referenced by the foreign key. We'll cast the referenced
-		// columns to an array since they aren't by the fluent command.
-		$foreign = $this->columnize($command->columns);
-
-		$referenced = $this->columnize((array) $command->references);
-
-		// Finally we can built the SQL. This should be the same for all database
-		// platforms we support, but we'll just keep it in the grammars since
-		// adding foreign keys using ALTER isn't supported by SQLite.
-		$sql = "ALTER TABLE $table ADD CONSTRAINT $name ";
-
-		die($sql .= "FOREIGN KEY ($foreign) REFERENCES $on ($referenced)");
-	}
-
 	/**
 	 * Generate the SQL statement for a drop table command.
 	 *
@@ -287,7 +254,7 @@ class Postgres extends Grammar {
 	 */
 	public function drop_unique(Table $table, Fluent $command)
 	{
-		return "ALTER TABLE ".$this->wrap($table)." DROP CONSTRAINT ".$command->name;
+		return $this->drop_constraint($table, $command);
 	}
 
 	/**
@@ -326,6 +293,18 @@ class Postgres extends Grammar {
 		return 'DROP INDEX '.$command->name;
 	}
 
+	/**
+	 * Drop a foreign key constraint from the table.
+	 *
+	 * @param  Table   $table
+	 * @param  Fluent  $fluent
+	 * @return string
+	 */
+	public function drop_foreign(Table $table, Fluent $command)
+	{
+		return $this->drop_constraint($table, $command);		
+	}
+
 	/**
 	 * Generate the data-type definition for a string.
 	 *

laravel/database/schema/grammars/sqlserver.php

@@ -212,39 +212,6 @@ class SQLServer extends Grammar {
 		return $create." INDEX {$command->name} ON ".$this->wrap($table)." ({$columns})";
 	}
 
-	/**
-	 * Generate the SQL statement for creating a foreign key.
-	 *
-	 * @param  Table    $table
-	 * @param  Command  $command
-	 * @return string
-	 */
-	public function foreign(Table $table, Fluent $command)
-	{
-		$name = $command->name;
-
-		// We need to wrap both of the table names in quoted identifiers to protect
-		// against any possible keyword collisions, both the table on which the
-		// command is being executed and the referenced table are wrapped.
-		$table = $this->wrap($table);
-
-		$on = $this->wrap($command->on);
-
-		// Next we need to columnize both the command table's columns as well as
-		// the columns referenced by the foreign key. We'll cast the referenced
-		// columns to an array since they aren't by the fluent command.
-		$foreign = $this->columnize($command->columns);
-
-		$referenced = $this->columnize((array) $command->references);
-
-		// Finally we can built the SQL. This should be the same for all database
-		// platforms we support, but we'll just keep it in the grammars since
-		// adding foreign keys using ALTER isn't supported by SQLite.
-		$sql = "ALTER TABLE $table ADD CONSTRAINT $name ";
-
-		die($sql .= "FOREIGN KEY ($foreign) REFERENCES $on ($referenced)");
-	}
-
 	/**
 	 * Generate the SQL statement for a drop table command.
 	 *
@@ -344,6 +311,18 @@ class SQLServer extends Grammar {
 		return "DROP INDEX {$command->name} ON ".$this->wrap($table);
 	}
 
+	/**
+	 * Drop a foreign key constraint from the table.
+	 *
+	 * @param  Table   $table
+	 * @param  Fluent  $fluent
+	 * @return string
+	 */
+	public function drop_foreign(Table $table, Fluent $command)
+	{
+		return $this->drop_constraint($table, $command);		
+	}
+
 	/**
 	 * Generate the data-type definition for a string.
 	 *

laravel/database/schema/table.php

@@ -207,6 +207,17 @@ class Table {
 		return $this->drop_key(__FUNCTION__, $name);
 	}
 
+	/**
+	 * Drop a foreign key constraint from the table.
+	 *
+	 * @param  string  $name
+	 * @return void
+	 */
+	public function drop_foreign($name)
+	{
+		return $this->drop_key(__FUNCTION__, $name);
+	}
+
 	/**
 	 * Create a command to drop any type of index.
 	 *
@@ -216,7 +227,7 @@ class Table {
 	 */
 	protected function drop_key($type, $name)
 	{
-		return $this->command($type, array('name' => $name));
+		return $this->command($type, compact('name'));
 	}
 
 	/**