From c246a7d17a545e45304d440016fc77d18b4f3d1a Mon Sep 17 00:00:00 2001
From: ElysaSrc <101974839+ElysaSrc@users.noreply.github.com>
Date: Sat, 29 Jun 2024 23:58:21 +0200
Subject: [PATCH] backend: srid on multipolygon

---
 backend/src/helpers/postgis_polygons.rs | 27 ++++++++++++++++++++++---
 backend/src/models/entity_cache.rs      |  4 ++--
 2 files changed, 26 insertions(+), 5 deletions(-)

diff --git a/backend/src/helpers/postgis_polygons.rs b/backend/src/helpers/postgis_polygons.rs
index 8d24baa..c39627b 100644
--- a/backend/src/helpers/postgis_polygons.rs
+++ b/backend/src/helpers/postgis_polygons.rs
@@ -7,7 +7,7 @@ type Polygon = Vec<Coordinates>;
 pub struct MultiPolygon(Vec<Polygon>);
 
 impl MultiPolygon {
-    pub fn to_polygon_string(&self) -> String {
+    pub fn to_polygon_string(&self, srid: Option<u32>) -> String {
         let polygons_str = self
             .0
             .iter()
@@ -22,7 +22,10 @@ impl MultiPolygon {
             .collect::<Vec<_>>()
             .join("),(");
 
-        format!("MULTIPOLYGON(({}))", polygons_str)
+        match srid {
+            Some(srid) => format!("SRID={};MULTIPOLYGON(({}))", srid, polygons_str),
+            None => format!("MULTIPOLYGON(({}))", polygons_str),
+        }
     }
 }
 
@@ -45,6 +48,24 @@ mod tests {
 
         let expected_string =
             "MULTIPOLYGON(((30 20, 45 40, 10 40, 30 20)),((15 5, 40 10, 10 20, 5 10, 15 5)))";
-        assert_eq!(multi_polygon.to_polygon_string(), expected_string);
+        assert_eq!(multi_polygon.to_polygon_string(None), expected_string);
+    }
+
+    #[test]
+    fn test_to_polygon_string_with_srid() {
+        let multi_polygon = MultiPolygon(vec![
+            vec![(30.0, 20.0), (45.0, 40.0), (10.0, 40.0), (30.0, 20.0)],
+            vec![
+                (15.0, 5.0),
+                (40.0, 10.0),
+                (10.0, 20.0),
+                (5.0, 10.0),
+                (15.0, 5.0),
+            ],
+        ]);
+
+        let expected_string =
+            "SRID=3857;MULTIPOLYGON(((30 20, 45 40, 10 40, 30 20)),((15 5, 40 10, 10 20, 5 10, 15 5)))";
+        assert_eq!(multi_polygon.to_polygon_string(Some(3857)), expected_string);
     }
 }
diff --git a/backend/src/models/entity_cache.rs b/backend/src/models/entity_cache.rs
index 4e746b0..11781d1 100644
--- a/backend/src/models/entity_cache.rs
+++ b/backend/src/models/entity_cache.rs
@@ -306,7 +306,7 @@ impl ViewerCachedEntity {
             request.ymax,
             request
                 .geographic_restriction
-                .map(|g| g.to_polygon_string()),
+                .map(|g| g.to_polygon_string(Some(3857))),
             request.family_id,
             request.allow_all_categories,
             request.allow_all_tags,
@@ -421,7 +421,7 @@ impl ViewerCachedEntity {
             request.search_query,
             request
                 .geographic_restriction
-                .map(|g| g.to_polygon_string()),
+                .map(|g| g.to_polygon_string(Some(3857))),
             request.family_id,
             request.allow_all_categories,
             request.allow_all_tags,