Fix: “Show all” table pagination (#3946)

Co-authored-by: Vlad Stan <stan.v.vlad@gmail.com>

tests/unit/test_db_fetch_page.py

@@ -1,7 +1,32 @@
 import pytest
 
+from lnbits.db import Filters
 from tests.helpers import DbTestModel
 
+TEST_DB_FETCH_PAGE_ROWS: tuple[dict[str, str], ...] = (
+    {"id": "1", "name": "Alice", "value": "foo"},
+    {"id": "2", "name": "Bob", "value": "bar"},
+    {"id": "3", "name": "Carol", "value": "bar"},
+    {"id": "4", "name": "Dave", "value": "bar"},
+    {"id": "5", "name": "Dave", "value": "foo"},
+    {"id": "6", "name": "Eve", "value": "foo"},
+    {"id": "7", "name": "Frank", "value": "bar"},
+    {"id": "8", "name": "Grace", "value": "foo"},
+    {"id": "9", "name": "Heidi", "value": "bar"},
+    {"id": "10", "name": "Ivan", "value": "foo"},
+    {"id": "11", "name": "Judy", "value": "bar"},
+    {"id": "12", "name": "Mallory", "value": "foo"},
+    {"id": "13", "name": "Niaj", "value": "bar"},
+    {"id": "14", "name": "Olivia", "value": "foo"},
+    {"id": "15", "name": "Peggy", "value": "bar"},
+    {"id": "16", "name": "Rupert", "value": "foo"},
+    {"id": "17", "name": "Sybil", "value": "bar"},
+    {"id": "18", "name": "Trent", "value": "foo"},
+    {"id": "19", "name": "Victor", "value": "bar"},
+    {"id": "20", "name": "Walter", "value": "foo"},
+    {"id": "21", "name": "Zoe", "value": "bar"},
+)
+
 
 @pytest.fixture(scope="session")
 async def fetch_page(db):
@@ -13,14 +38,14 @@ async def fetch_page(db):
             name TEXT NOT NULL
         )
         """)
-    await db.execute("""
-        INSERT INTO test_db_fetch_page (id, name, value) VALUES
-            ('1', 'Alice', 'foo'),
-            ('2', 'Bob', 'bar'),
-            ('3', 'Carol', 'bar'),
-            ('4', 'Dave', 'bar'),
-            ('5', 'Dave', 'foo')
-        """)
+    for row in TEST_DB_FETCH_PAGE_ROWS:
+        await db.execute(
+            """
+            INSERT INTO test_db_fetch_page (id, name, value)
+            VALUES (:id, :name, :value)
+            """,
+            row,
+        )
     yield
     await db.execute("DROP TABLE test_db_fetch_page")
 
@@ -33,8 +58,35 @@ async def test_db_fetch_page_simple(fetch_page, db):
     )
 
     assert row
-    assert row.total == 5
-    assert len(row.data) == 5
+    assert row.total == len(TEST_DB_FETCH_PAGE_ROWS)
+    assert len(row.data) == Filters().limit
+
+
+@pytest.mark.anyio
+async def test_db_fetch_page_limit_zero_returns_all(fetch_page, db):
+    row = await db.fetch_page(
+        query="select * from test_db_fetch_page",
+        filters=Filters(limit=0),
+        model=DbTestModel,
+    )
+
+    assert row
+    assert row.total == len(TEST_DB_FETCH_PAGE_ROWS)
+    assert len(row.data) == len(TEST_DB_FETCH_PAGE_ROWS)
+
+
+@pytest.mark.anyio
+async def test_db_fetch_page_limit(fetch_page, db):
+    limit = 5
+    row = await db.fetch_page(
+        query="select * from test_db_fetch_page",
+        filters=Filters(limit=limit),
+        model=DbTestModel,
+    )
+
+    assert row
+    assert row.total == len(TEST_DB_FETCH_PAGE_ROWS)
+    assert len(row.data) == limit
 
 
 @pytest.mark.anyio
@@ -45,7 +97,7 @@ async def test_db_fetch_page_group_by(fetch_page, db):
         group_by=["name"],
     )
     assert row
-    assert row.total == 4
+    assert row.total == len({test_row["name"] for test_row in TEST_DB_FETCH_PAGE_ROWS})
 
 
 @pytest.mark.anyio
@@ -56,7 +108,9 @@ async def test_db_fetch_page_group_by_multiple(fetch_page, db):
         group_by=["value", "name"],
     )
     assert row
-    assert row.total == 5
+    assert row.total == len(
+        {(test_row["value"], test_row["name"]) for test_row in TEST_DB_FETCH_PAGE_ROWS}
+    )
 
 
 @pytest.mark.anyio