Adding coordinate to Location model

microservices/LocationsApi/Controllers/LocationsController.cs

@@ -2,6 +2,7 @@ using LocationsApi.Models;
 using LocationsApi.Services;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
+using MongoDB.Driver;
 
 namespace LocationsApi.Controllers;
 
@@ -23,13 +24,25 @@ public class LocationsController : ControllerBase
         if (string.IsNullOrWhiteSpace(req.Name))
             return BadRequest("Name required");
 
+        if (req.Coord is null)
+            return BadRequest("Coord required");
+
         var location = new Location
         {
             Name = req.Name.Trim(),
+            Coord = req.Coord,
             CreatedUtc = DateTime.UtcNow
         };
 
-        await _locations.CreateAsync(location);
+        try
+        {
+            await _locations.CreateAsync(location);
+        }
+        catch (MongoWriteException ex) when (ex.WriteError.Category == ServerErrorCategory.DuplicateKey)
+        {
+            return Conflict("Coord must be unique");
+        }
+
         return Ok(location);
     }
 
@@ -59,6 +72,9 @@ public class LocationsController : ControllerBase
         if (string.IsNullOrWhiteSpace(req.Name))
             return BadRequest("Name required");
 
+        if (req.Coord is not null)
+            return BadRequest("Coord cannot be updated");
+
         var updated = await _locations.UpdateNameAsync(id, req.Name.Trim());
         if (!updated)
             return NotFound();

microservices/LocationsApi/DOCUMENTS.md

@@ -7,7 +7,11 @@ Inbound JSON documents
 - CreateLocationRequest (`POST /api/locations`)
   ```json
   {
-    "name": "string"
+    "name": "string",
+    "coord": {
+      "x": 0,
+      "y": 0
+    }
   }
   ```
 - UpdateLocationRequest (`PUT /api/locations/{id}`)
@@ -16,6 +20,7 @@ Inbound JSON documents
     "name": "string"
   }
   ```
+  `coord` cannot be updated.
 
 Stored documents (MongoDB)
 - Location
@@ -23,6 +28,10 @@ Stored documents (MongoDB)
   {
     "id": "string (ObjectId)",
     "name": "string",
+    "coord": {
+      "x": 0,
+      "y": 0
+    },
     "createdUtc": "string (ISO-8601 datetime)"
   }
   ```

microservices/LocationsApi/Models/CreateLocationRequest.cs

@@ -3,4 +3,6 @@ namespace LocationsApi.Models;
 public class CreateLocationRequest
 {
     public string Name { get; set; } = string.Empty;
+
+    public required Coord Coord { get; set; }
 }

microservices/LocationsApi/Models/Location.cs

@@ -11,5 +11,7 @@ public class Location
 
     public string Name { get; set; } = string.Empty;
 
+    public required Coord Coord { get; set; }
+
     public DateTime CreatedUtc { get; set; } = DateTime.UtcNow;
 }

microservices/LocationsApi/Models/UpdateLocationRequest.cs

@@ -3,4 +3,6 @@ namespace LocationsApi.Models;
 public class UpdateLocationRequest
 {
     public string Name { get; set; } = string.Empty;
+
+    public Coord? Coord { get; set; }
 }

microservices/LocationsApi/README.md

@@ -4,7 +4,7 @@
 See `DOCUMENTS.md` for request payloads and stored document shapes.
 
 ## Endpoints
-- `POST /api/locations` Create a location (SUPER only).
+- `POST /api/locations` Create a location with a unique coord pair (SUPER only).
 - `GET /api/locations` List all locations (SUPER only).
 - `DELETE /api/locations/{id}` Delete a location (SUPER only).
 - `PUT /api/locations/{id}` Update a location name (SUPER only).

microservices/LocationsApi/Services/LocationStore.cs

@@ -1,4 +1,5 @@
 using LocationsApi.Models;
+using MongoDB.Bson;
 using MongoDB.Driver;
 
 namespace LocationsApi.Services;
@@ -13,8 +14,71 @@ public class LocationStore
         var dbName = cfg["MongoDB:DatabaseName"] ?? "GameDb";
         var client = new MongoClient(cs);
         var db = client.GetDatabase(dbName);
-        _col = db.GetCollection<Location>("Locations");
+        var collectionName = "Locations";
+        EnsureLocationSchema(db, collectionName);
+        _col = db.GetCollection<Location>(collectionName);
 
+        var coordIndex = Builders<Location>.IndexKeys
+            .Ascending(l => l.Coord.X)
+            .Ascending(l => l.Coord.Y);
+        var coordIndexOptions = new CreateIndexOptions { Unique = true };
+        _col.Indexes.CreateOne(new CreateIndexModel<Location>(coordIndex, coordIndexOptions));
+    }
+
+    private static void EnsureLocationSchema(IMongoDatabase db, string collectionName)
+    {
+        var validator = new BsonDocument
+        {
+            {
+                "$jsonSchema", new BsonDocument
+                {
+                    { "bsonType", "object" },
+                    { "required", new BsonArray { "name", "coord", "createdUtc" } },
+                    {
+                        "properties", new BsonDocument
+                        {
+                            { "name", new BsonDocument { { "bsonType", "string" } } },
+                            {
+                                "coord", new BsonDocument
+                                {
+                                    { "bsonType", "object" },
+                                    { "required", new BsonArray { "x", "y" } },
+                                    {
+                                        "properties", new BsonDocument
+                                        {
+                                            { "x", new BsonDocument { { "bsonType", "int" } } },
+                                            { "y", new BsonDocument { { "bsonType", "int" } } }
+                                        }
+                                    }
+                                }
+                            },
+                            { "createdUtc", new BsonDocument { { "bsonType", "date" } } }
+                        }
+                    }
+                }
+            }
+        };
+
+        var options = new CreateCollectionOptions
+        {
+            Validator = new BsonDocumentFilterDefinition<BsonDocument>(validator),
+            ValidationAction = DocumentValidationAction.Error
+        };
+
+        var collections = db.ListCollectionNames().ToList();
+        if (!collections.Contains(collectionName))
+        {
+            db.CreateCollection(collectionName, options);
+            return;
+        }
+
+        var command = new BsonDocument
+        {
+            { "collMod", collectionName },
+            { "validator", validator },
+            { "validationAction", "error" }
+        };
+        db.RunCommand<BsonDocument>(command);
     }
 
     public Task CreateAsync(Location location) => _col.InsertOneAsync(location);