Fixed null values handling for PostgresSQL arrays

Fixes #15804

framework/CHANGELOG.md

@@ -8,6 +8,7 @@ Yii Framework 2 Change Log
 - Bug #15792: Added missing `yii\db\QueryBuilder::conditionClasses` setter (silverfire)
 - Bug #15822: Fixed `yii\base\Component::off()` not to throw an exception when handler does not exist (silverfire)
 - Bug #15817: Fixed support of deprecated array format type casting in `yii\db\Command::bindValues()` (silverfire)
+- Bug #15804: Fixed `null` values handling for PostgresSQL arrays (silverfire)
 
 
 2.0.14.1 February 24, 2018

framework/db/ArrayExpression.php

@@ -182,10 +182,14 @@ class ArrayExpression implements ExpressionInterface, \ArrayAccess, \Countable,
      */
     public function getIterator()
     {
-        if ($this->getValue() instanceof QueryInterface) {
+        $value = $this->getValue();
+        if ($value instanceof QueryInterface) {
             throw new InvalidConfigException('The ArrayExpression class can not be iterated when the value is a QueryInterface object');
         }
+        if ($value === null) {
+            $value = [];
+        }
 
-        return new \ArrayIterator($this->getValue());
+        return new \ArrayIterator($value);
     }
 }

framework/db/pgsql/ArrayExpressionBuilder.php

@@ -32,6 +32,9 @@ class ArrayExpressionBuilder implements ExpressionBuilderInterface
     public function build(ExpressionInterface $expression, array &$params = [])
     {
         $value = $expression->getValue();
+        if ($value === null) {
+            return 'NULL';
+        }
 
         if ($value instanceof Query) {
             list ($sql, $params) = $this->queryBuilder->build($value, $params);

framework/db/pgsql/ArrayParser.php

@@ -102,6 +102,8 @@ class ArrayParser
 
         if (!$isQuoted && $result === 'NULL') {
             $result = null;
+        } elseif ($isQuoted && $result === '{}') {
+            $result = [];
         }
 
         return $result;

framework/db/pgsql/ColumnSchema.php

@@ -83,6 +83,8 @@ class ColumnSchema extends \yii\db\ColumnSchema
                 array_walk_recursive($value, function (&$val, $key) {
                     $val = $this->phpTypecastValue($val);
                 });
+            } elseif ($value === null) {
+                return null;
             }
 
             return $this->deserializeArrayColumnToArrayExpression

tests/framework/db/pgsql/ActiveRecordTest.php

@@ -228,6 +228,27 @@ class ActiveRecordTest extends \yiiunit\framework\db\ActiveRecordTest
                 'jsonb_col' => [[null, 'a', 'b', '\"', '{"af"}']],
                 'jsonarray_col' => [new ArrayExpression([[',', 'null', true, 'false', 'f']], 'json')],
             ]],
+            'null arrays values' => [[
+                'intarray_col' => [
+                    null,
+                ],
+                'textarray2_col' => [
+                    [null, null],
+                    new ArrayExpression([null, null], 'text', 2),
+                ],
+                'json_col' => [
+                    null
+                ],
+                'jsonarray_col' => [
+                    null
+                ],
+            ]],
+            'empty arrays values' => [[
+                'textarray2_col' => [
+                    ['', ''],
+                    new ArrayExpression([[], []], 'text', 2),
+                ],
+            ]],
             'arrays packed in classes' => [[
                 'intarray_col' => [
                     new ArrayExpression([1,-2,null,'42'], 'int', 1),
@@ -257,7 +278,7 @@ class ActiveRecordTest extends \yiiunit\framework\db\ActiveRecordTest
                 'jsonb_col' => [
                     pi()
                 ],
-            ]]
+            ]],
         ];
     }
 }