Fixed search for single enum value in PostgreSQL

src/Driver/Postgres/Schema/PostgresColumn.php

@@ -692,19 +692,10 @@ private static function resolveConstrains(
         );
 
         foreach ($constraints as $constraint) {
-            if (preg_match('/ARRAY\[([^\]]+)\]/', $constraint['consrc'], $matches)) {
-                $enumValues = explode(',', $matches[1]);
-                foreach ($enumValues as &$value) {
-                    if (preg_match("/^'?(.*?)'?::(.+)/", trim($value, ' ()'), $matches)) {
-                        //In database: 'value'::TYPE
-                        $value = $matches[1];
-                    }
-
-                    unset($value);
-                }
-                unset($value);
+            $values = static::parseEnumValues($constraint['consrc']);
 
-                $column->enumValues = $enumValues;
+            if ($values !== []) {
+                $column->enumValues = $values;
                 $column->constrainName = $constraint['conname'];
                 $column->constrained = true;
             }
@@ -729,4 +720,29 @@ private static function resolveEnum(DriverInterface $driver, self $column): void
             );
         }
     }
+
+    private static function parseEnumValues(string $constraint): array
+    {
+        if (\preg_match('/ARRAY\[([^\]]+)\]/', $constraint, $matches)) {
+            $enumValues = \explode(',', $matches[1]);
+            foreach ($enumValues as &$value) {
+                if (\preg_match("/^'?([a-zA-Z0-9_]++)'?::([a-zA-Z0-9_]++)/", \trim($value, ' ()'), $matches)) {
+                    //In database: 'value'::TYPE
+                    $value = $matches[1];
+                }
+
+                unset($value);
+            }
+            unset($value);
+
+            return $enumValues;
+        }
+
+        $pattern = '/CHECK \\(\\(\\([a-zA-Z0-9_]++\\)::([a-z]++) = \'([a-zA-Z0-9_]++)\'::([a-z]++)\\)\\)/i';
+        if (\preg_match($pattern, $constraint, $matches) && !empty($matches[2])) {
+            return [$matches[2]];
+        }
+
+        return [];
+    }
 }

tests/Database/Functional/Driver/Common/Schema/ConsistencyTest.php

@@ -164,6 +164,20 @@ public function testEnum(): void
         $this->assertTrue($schema->column('target')->compare($column));
     }
 
+    public function testEnumWithSingleValue(): void
+    {
+        $schema = $this->schema('table');
+        $this->assertFalse($schema->exists());
+
+        $column = $schema->enum('target', ['catalog']);
+
+        $schema->save();
+        $schema = $this->schema('table');
+        $this->assertTrue($schema->exists());
+        $this->assertTrue($schema->column('target')->compare($column));
+        $this->assertSame(['catalog'], $schema->column('target')->getEnumValues());
+    }
+
     public function testJson(): void
     {
         $schema = $this->schema('table');

tests/Database/Unit/Driver/Postgres/Schema/PostgresColumnTest.php

@@ -0,0 +1,74 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Cycle\Database\Tests\Unit\Driver\Postgres\Schema;
+
+use Cycle\Database\Driver\Postgres\Schema\PostgresColumn;
+use PHPUnit\Framework\TestCase;
+
+final class PostgresColumnTest extends TestCase
+{
+    /**
+     * @dataProvider enumConstrainsDataProvider
+     */
+    public function testParseEnumValues(string $constrain, array $expected): void
+    {
+        $column = new PostgresColumn('', '');
+
+        $ref = new \ReflectionMethod($column, 'parseEnumValues');
+        $ref->setAccessible(true);
+
+        $this->assertSame($expected, $ref->invoke($column, $constrain));
+    }
+
+    public static function enumConstrainsDataProvider(): \Traversable
+    {
+        yield ['', []];
+        yield ['foo', []];
+
+        // simple single value
+        yield ["CHECK (((target)::text = 'catalog'::text))", ['catalog']];
+
+        // single value with underscore
+        yield ["CHECK (((type)::text = 'user_profile'::text))", ['user_profile']];
+
+        // single value with number
+        yield ["CHECK (((type)::text = 'user_profile_2015'::text))", ['user_profile_2015']];
+        yield ["CHECK (((type)::text = 'user_profile2015'::text))", ['user_profile2015']];
+
+        // single value in table with underscore
+        yield ["CHECK (((log_type)::text = 'order'::text))", ['order']];
+
+        // single value in table with number
+        yield ["CHECK (((type_2013)::text = 'user_profile'::text))", ['user_profile']];
+        yield ["CHECK (((type2)::text = 'catalog'::text))", ['catalog']];
+
+        // simple multiple values
+        yield ["CHECK (((target)::text = ANY (ARRAY['catalog'::text, 'view'::text])))", ['catalog', 'view']];
+
+        // multiple values in table with underscore
+        yield ["CHECK (((log_type)::text = ANY (ARRAY['catalog'::text, 'view'::text])))", ['catalog', 'view']];
+
+        // multiple values in table with number
+        yield ["CHECK (((log_type2)::text = ANY (ARRAY['catalog'::text, 'view'::text])))", ['catalog', 'view']];
+        yield ["CHECK (((log_type_2)::text = ANY (ARRAY['catalog'::text, 'view'::text])))", ['catalog', 'view']];
+
+        // multiple values with underscore
+        yield ["CHECK (((type)::text = ANY (ARRAY['user_profile'::text, 'view'::text])))", ['user_profile', 'view']];
+
+        // multiple values with number
+        yield [
+            "CHECK (((type)::text = ANY (ARRAY['user_profile_2'::text, 'view'::text])))",
+            ['user_profile_2', 'view'],
+        ];
+        yield [
+            "CHECK (((type)::text = ANY (ARRAY['user_profile2'::text, 'view'::text])))",
+            ['user_profile2', 'view'],
+        ];
+
+        // different type casting TODO: it can be unnecessary
+        yield ["CHECK (((target)::foo = 'catalog'::bar))", ['catalog']];
+        yield ["CHECK (((log_type)::foo = ANY (ARRAY['catalog'::bar, 'view'::baz])))", ['catalog', 'view']];
+    }
+}