[11.x] Added dropColumnsIfExists, dropColumnIfExists and dropForeignIfExists (#53305)

* Added dropColumnsIfExists and dropColumnIfExists

* Update src/Illuminate/Database/Schema/Blueprint.php

Thanks!

Co-authored-by: Punyapal Shah  <[email protected]>

* Simplified dropColumnIfExists

* Added `dropForeignIfExists` to complement `dropColumnIfExists`

* Updated dropForeignIfExists comment

* Update Blueprint.php

* Update Blueprint.php

* Update Blueprint.php

* Update Builder.php

---------

Co-authored-by: Punyapal Shah <[email protected]>
Co-authored-by: Taylor Otwell <[email protected]>

Author: 3 people

src/Illuminate/Database/Schema/Blueprint.php

@@ -9,6 +9,7 @@
 use Illuminate\Database\Schema\Grammars\Grammar;
 use Illuminate\Database\Schema\Grammars\MySqlGrammar;
 use Illuminate\Database\Schema\Grammars\SQLiteGrammar;
+use Illuminate\Support\Facades\Schema;
 use Illuminate\Support\Fluent;
 use Illuminate\Support\Traits\Macroable;
 
@@ -427,6 +428,25 @@ public function dropColumn($columns)
         return $this->addCommand('dropColumn', compact('columns'));
     }
 
+    /**
+     * Indicate that the given columns should be dropped if they exist.
+     *
+     * @param  array|mixed  $columns
+     * @return \Illuminate\Support\Fluent
+     */
+    public function dropColumnIfExists($columns)
+    {
+        $columns = is_array($columns) ? $columns : func_get_args();
+
+        $columns = array_intersect($columns, Schema::getColumnListing($this->getTable()));
+
+        if (empty($columns)) {
+            return new Fluent;
+        }
+
+        return $this->dropColumn($columns);
+    }
+
     /**
      * Indicate that the given columns should be renamed.
      *
@@ -505,6 +525,25 @@ public function dropForeign($index)
         return $this->dropIndexCommand('dropForeign', 'foreign', $index);
     }
 
+    /**
+     * Indicate that the given foreign key should be dropped if it exists.
+     *
+     * @param  string|array  $index
+     * @return \Illuminate\Support\Fluent
+     */
+    public function dropForeignIfExists($index)
+    {
+        if (is_array($index)) {
+            $index = $this->createIndexName('foreign', $index);
+        }
+
+        if (! in_array($index, Schema::getForeignKeys($this->getTable()))) {
+            return new Fluent;
+        }
+
+        return $this->dropIndexCommand('dropForeign', 'foreign', $index);
+    }
+
     /**
      * Indicate that the given column and foreign key should be dropped.
      *

src/Illuminate/Database/Schema/Builder.php

@@ -462,6 +462,20 @@ public function dropColumns($table, $columns)
         });
     }
 
+    /**
+     * Drop columns from a table schema if they exist.
+     *
+     * @param  string  $table
+     * @param  string|array  $columns
+     * @return void
+     */
+    public function dropColumnsIfExists($table, $columns)
+    {
+        $this->table($table, function (Blueprint $blueprint) use ($columns) {
+            $blueprint->dropColumnIfExists($columns);
+        });
+    }
+
     /**
      * Drop all tables from the database.
      *