From fedc36d3af29264520182ac6a5d78282aa473b31 Mon Sep 17 00:00:00 2001
From: "chandr-andr (Kiselev Aleksandr)" <chandr@chandr.net>
Date: Sat, 21 Sep 2024 13:52:29 +0200
Subject: [PATCH] Fixed runtime error

Signed-off-by: chandr-andr (Kiselev Aleksandr) <chandr@chandr.net>
---
 python/tests/test_value_converter.py |  19 +++++
 src/value_converter.rs               | 108 ++++++++++++++-------------
 2 files changed, 77 insertions(+), 50 deletions(-)

diff --git a/python/tests/test_value_converter.py b/python/tests/test_value_converter.py
index 710e1c1..8fe3199 100644
--- a/python/tests/test_value_converter.py
+++ b/python/tests/test_value_converter.py
@@ -1001,3 +1001,22 @@ async def test_incorrect_dimensions_array(
                 ],
             ],
         )
+
+
+async def test_empty_array(
+    psql_pool: ConnectionPool,
+) -> None:
+    await psql_pool.execute("DROP TABLE IF EXISTS test_earr")
+    await psql_pool.execute(
+        "CREATE TABLE test_earr (id serial NOT NULL PRIMARY KEY, e_array text[] NOT NULL DEFAULT array[]::text[])",
+    )
+
+    await psql_pool.execute("INSERT INTO test_earr(id) VALUES(2);")
+
+    res = await psql_pool.execute(
+        "SELECT * FROM test_earr WHERE id = 2",
+    )
+
+    json_result = res.result()
+    assert json_result
+    assert not json_result[0]["e_array"]
diff --git a/src/value_converter.rs b/src/value_converter.rs
index 0889198..2c46722 100644
--- a/src/value_converter.rs
+++ b/src/value_converter.rs
@@ -835,35 +835,39 @@ fn _pythondto_array_to_serde(
     dimension_index: usize,
     mut lower_bound: usize,
 ) -> RustPSQLDriverPyResult<Value> {
-    let current_dimension = dimensions.get(dimension_index).unwrap();
-
-    let possible_next_dimension = dimensions.get(dimension_index + 1);
-    match possible_next_dimension {
-        Some(next_dimension) => {
-            let mut final_list: Value = Value::Array(vec![]);
-
-            for _ in 0..current_dimension.len as usize {
-                if dimensions.get(dimension_index + 1).is_some() {
-                    let inner_pylist = _pythondto_array_to_serde(
-                        dimensions,
-                        &data[lower_bound..next_dimension.len as usize + lower_bound],
-                        dimension_index + 1,
-                        0,
-                    )?;
-                    match final_list {
-                        Value::Array(ref mut array) => array.push(inner_pylist),
-                        _ => unreachable!(),
-                    }
-                    lower_bound += next_dimension.len as usize;
-                };
-            }
+    let current_dimension = dimensions.get(dimension_index);
+
+    if let Some(current_dimension) = current_dimension {
+        let possible_next_dimension = dimensions.get(dimension_index + 1);
+        match possible_next_dimension {
+            Some(next_dimension) => {
+                let mut final_list: Value = Value::Array(vec![]);
+
+                for _ in 0..current_dimension.len as usize {
+                    if dimensions.get(dimension_index + 1).is_some() {
+                        let inner_pylist = _pythondto_array_to_serde(
+                            dimensions,
+                            &data[lower_bound..next_dimension.len as usize + lower_bound],
+                            dimension_index + 1,
+                            0,
+                        )?;
+                        match final_list {
+                            Value::Array(ref mut array) => array.push(inner_pylist),
+                            _ => unreachable!(),
+                        }
+                        lower_bound += next_dimension.len as usize;
+                    };
+                }
 
-            Ok(final_list)
-        }
-        None => {
-            return data.iter().map(|x| x.to_serde_value()).collect();
+                return Ok(final_list);
+            }
+            None => {
+                return data.iter().map(|x| x.to_serde_value()).collect();
+            }
         }
     }
+
+    Ok(Value::Array(vec![]))
 }
 
 /// Convert rust array to python list.
@@ -899,33 +903,37 @@ fn _postgres_array_to_py<T>(
 where
     T: ToPyObject,
 {
-    let current_dimension = dimensions.get(dimension_index).unwrap();
-
-    let possible_next_dimension = dimensions.get(dimension_index + 1);
-    match possible_next_dimension {
-        Some(next_dimension) => {
-            let final_list = PyList::empty_bound(py);
-
-            for _ in 0..current_dimension.len as usize {
-                if dimensions.get(dimension_index + 1).is_some() {
-                    let inner_pylist = _postgres_array_to_py(
-                        py,
-                        dimensions,
-                        &data[lower_bound..next_dimension.len as usize + lower_bound],
-                        dimension_index + 1,
-                        0,
-                    );
-                    final_list.append(inner_pylist).unwrap();
-                    lower_bound += next_dimension.len as usize;
-                };
-            }
+    let current_dimension = dimensions.get(dimension_index);
+
+    if let Some(current_dimension) = current_dimension {
+        let possible_next_dimension = dimensions.get(dimension_index + 1);
+        match possible_next_dimension {
+            Some(next_dimension) => {
+                let final_list = PyList::empty_bound(py);
+
+                for _ in 0..current_dimension.len as usize {
+                    if dimensions.get(dimension_index + 1).is_some() {
+                        let inner_pylist = _postgres_array_to_py(
+                            py,
+                            dimensions,
+                            &data[lower_bound..next_dimension.len as usize + lower_bound],
+                            dimension_index + 1,
+                            0,
+                        );
+                        final_list.append(inner_pylist).unwrap();
+                        lower_bound += next_dimension.len as usize;
+                    };
+                }
 
-            final_list.unbind()
-        }
-        None => {
-            return PyList::new_bound(py, data).unbind();
+                return final_list.unbind();
+            }
+            None => {
+                return PyList::new_bound(py, data).unbind();
+            }
         }
     }
+
+    return PyList::empty_bound(py).unbind();
 }
 
 #[allow(clippy::too_many_lines)]