tout est bon

src/main/java/org/ghuh/ctcd/controllers/CityController.java

@@ -45,7 +45,8 @@ public List<City> getCity() {
     }
 
     @PostMapping("/city")
-    public City saveCity(@RequestBody City city) {
-        return this.cityService.save(city);
+    public ResponseEntity<City> saveCity(@RequestBody City city) {
+        City savedCity = this.cityService.save(city);
+        return new ResponseEntity<>(savedCity, HttpStatus.CREATED);
     }
 }

src/main/java/org/ghuh/ctcd/entities/City.java

@@ -1,6 +1,7 @@
 package org.ghuh.ctcd.entities;
 
 import com.fasterxml.jackson.annotation.JsonAlias;
+import com.fasterxml.jackson.annotation.JsonProperty;
 
 import jakarta.persistence.Column;
 import jakarta.persistence.Entity;
@@ -16,15 +17,15 @@ public class City {
     private int id;
 
     @Column(name = "department_code", nullable = false)
-    @JsonAlias("department_code")
+    @JsonProperty("department_code")
     private String departmentCode;
 
     @Column(name = "insee_code")
-    @JsonAlias("insee_code")
+    @JsonProperty("insee_code")
     private String inseeCode;
 
     @Column(name = "zip_code")
-    @JsonAlias("zip_code")
+    @JsonProperty("zip_code")
     private String zipCode;
 
     @Column(name = "name", nullable=false)