API: add 'v' prefix to version in delta endpoint

server/mergin/sync/files.py

@@ -334,6 +334,7 @@ def patch_field(self, data, **kwargs):
 class DeltaChangeItemSchema(DeltaChangeBaseSchema):
     """Schema for delta changes response"""
 
+    version = fields.Function(lambda obj: f"v{obj.version}")
     diffs = fields.List(fields.Nested(DeltaChangeDiffFileSchema()))
 
     @post_dump

server/mergin/sync/public_api_v2.yaml

@@ -393,16 +393,12 @@ paths:
           in: query
           required: true
           schema:
-            type: integer
-            example:
-            minimum: 0
+            $ref: "#/components/schemas/VersionName"
           description: Start version (exclusive)
         - name: to
           in: query
           schema:
-            type: integer
-            example: 2
-            minimum: 1
+            $ref: "#/components/schemas/VersionName"
           description: End version (inclusive)
       responses:
         "200":
@@ -858,8 +854,7 @@ components:
           type: string
           example: 9adb76bf81a34880209040ffe5ee262a090b62ab
         version:
-          type: integer
-          example: 1
+          $ref: "#/components/schemas/VersionName"
         change:
           $ref: "#/components/schemas/ProjectChangeType"
         diffs:
@@ -880,3 +875,7 @@ components:
           type: array
           items:
             $ref: "#/components/schemas/ProjectDeltaChange"
+    VersionName:
+      type: string
+      pattern: '^v\d+$'
+      example: v2

server/mergin/sync/public_api_v2_controller.py

@@ -405,11 +405,18 @@ def upload_chunk(id: str):
     )
 
 
-def get_project_delta(id: str, since: int, to: Optional[int] = None):
+def get_project_delta(id: str, since: str, to: Optional[str] = None):
     """Get project changes (delta) between two versions"""
 
     project: Project = require_project_by_uuid(id, ProjectPermissions.Read)
-    to = project.latest_version if to is None else to
+    since = ProjectVersion.from_v_name(since)
+    to = project.latest_version if to is None else ProjectVersion.from_v_name(to)
+    if since < 0 or to < 1:
+        abort(
+            400,
+            "Invalid version number, minimum version for 'since' is 0 and minimum version for 'to' is 1",
+        )
+
     if to > project.latest_version:
         abort(400, "'to' version exceeds latest project version")
 

server/mergin/tests/test_public_api_v2.py

@@ -923,60 +923,60 @@ def test_project_delta(client, diff_project):
         os.path.join(working_dir, "base.gpkg"),
     )
     push_change(initial_project, "added", "base.gpkg", working_dir)
-    response = client.get(f"v2/projects/{initial_project.id}/delta?since=0")
+    response = client.get(f"v2/projects/{initial_project.id}/delta?since=v0")
     assert response.status_code == 200
     changes = response.json["items"]
     assert len(changes) == 1
     assert changes[0]["change"] == PushChangeType.CREATE.value
-    assert changes[0]["version"] == 1
+    assert changes[0]["version"] == "v1"
 
     # remove the file and get changes from 0 -> 2 where base gpgkg is removed -> transparent
     push_change(initial_project, "removed", "base.gpkg", working_dir)
-    response = client.get(f"v2/projects/{initial_project.id}/delta?since=0")
+    response = client.get(f"v2/projects/{initial_project.id}/delta?since=v0")
     assert response.status_code == 200
     changes = response.json["items"]
     assert len(changes) == 0
 
     # non valid cases
     response = client.get(f"v2/projects/{diff_project.id}/delta")
     assert response.status_code == 400
-    response = client.get(f"v2/projects/{diff_project.id}/delta?since=2&to=1")
+    response = client.get(f"v2/projects/{diff_project.id}/delta?since=v2&to=v1")
     assert response.status_code == 400
-    response = client.get(f"v2/projects/{diff_project.id}/delta?since=-2")
+    response = client.get(f"v2/projects/{diff_project.id}/delta?since=v-2")
     assert response.status_code == 400
-    response = client.get(f"v2/projects/{diff_project.id}/delta?since=-2&to=-1")
+    response = client.get(f"v2/projects/{diff_project.id}/delta?since=v-2&to=v-1")
     assert response.status_code == 400
     # exceeding latest version
-    response = client.get(f"v2/projects/{diff_project.id}/delta?since=0&to=2000")
+    response = client.get(f"v2/projects/{diff_project.id}/delta?since=v0&to=v2000")
     assert response.status_code == 400
     # no changes between versions with same number
-    response = client.get(f"v2/projects/{diff_project.id}/delta?since=1&to=1")
+    response = client.get(f"v2/projects/{diff_project.id}/delta?since=v1&to=v1")
     assert response.status_code == 400
 
     # since 1 to latest version
-    response = client.get(f"v2/projects/{diff_project.id}/delta?since=1")
+    response = client.get(f"v2/projects/{diff_project.id}/delta?since=v1")
     assert response.status_code == 200
     changes = response.json["items"]
     # create of test.gpkg and delete base.gpkg
     assert len(changes) == 2
     assert changes[0]["change"] == PushChangeType.DELETE.value
-    assert changes[0]["version"] == 9
+    assert changes[0]["version"] == "v9"
     assert changes[0]["path"] == "base.gpkg"
     assert changes[0]["size"] == 98304
 
     assert changes[1]["change"] == PushChangeType.CREATE.value
-    assert changes[1]["version"] == 9
+    assert changes[1]["version"] == "v9"
     assert changes[1]["path"] == "test.gpkg"
     assert changes[1]["size"] == 98304
 
     # simple update
-    response = client.get(f"v2/projects/{diff_project.id}/delta?since=4&to=8")
+    response = client.get(f"v2/projects/{diff_project.id}/delta?since=v4&to=v8")
     assert response.status_code == 200
     changes = response.json["items"]
     assert len(changes) == 1
     assert changes[0]["change"] == PushChangeType.UPDATE.value
     # version is new latest version of the change
-    assert changes[0]["version"] == 7
+    assert changes[0]["version"] == "v7"
     assert not changes[0].get("diffs")
 
 
@@ -990,12 +990,14 @@ def test_project_pull_diffs(client, diff_project):
         .order_by(FileDiff.version)
         .all()
     )
-    response = client.get(f"v2/projects/{diff_project.id}/delta?since={since}&to={to}")
+    response = client.get(
+        f"v2/projects/{diff_project.id}/delta?since=v{since}&to=v{to}"
+    )
     assert response.status_code == 200
     delta = response.json["items"]
     assert len(delta) == 1
     assert delta[0]["change"] == PushChangeType.UPDATE_DIFF.value
-    assert delta[0]["version"] == 7
+    assert delta[0]["version"] == "v7"
     first_diff = delta[0]["diffs"][0]
     second_diff = delta[0]["diffs"][1]
     assert first_diff["path"] == current_diffs[0].path