Fix ShardKeys property by using collection type instead of string.

arangodb-net-standard.Test/CollectionApi/CollectionApiClientTest.cs

@@ -112,17 +112,35 @@ public async Task PostCollectionAsync_ShouldSucceed_WhenEdgeCollection()
             var response = await _collectionApi.PostCollectionAsync(
                 new PostCollectionBody
                 {
-                    Name = "MyEdgeCollection",
+                    Name = nameof(PostCollectionAsync_ShouldSucceed_WhenEdgeCollection),
                     Type = CollectionType.Edge
                 });
 
             Assert.False(response.Error);
             Assert.NotNull(response.Id);
-            Assert.Equal("MyEdgeCollection", response.Name);
+            Assert.Equal(
+                nameof(PostCollectionAsync_ShouldSucceed_WhenEdgeCollection),
+                response.Name);
             Assert.Equal("traditional", response.KeyOptions.Type);
             Assert.Equal(CollectionType.Edge, response.Type); // 2 is document collection, 3 is edge collection
         }
 
+        [Fact]
+        public async Task PostCollectionAsync_ShouldSucceed_WhenSharding()
+        {
+            var response = await _collectionApi.PostCollectionAsync(
+                new PostCollectionBody
+                {
+                    Name = nameof(PostCollectionAsync_ShouldSucceed_WhenSharding),
+                    NumberOfShards = 4,
+                    ShardKeys = new string[] { "country" },
+                    ReplicationFactor = 2
+                });
+
+            Assert.False(response.Error);
+            Assert.NotNull(response.Id);
+        }
+
         [Fact]
         public async Task PostCollectionAsync_ShouldUseQueryParameter()
         {

arangodb-net-standard/CollectionApi/Models/GetCollectionPropertiesResponse.cs

@@ -1,4 +1,5 @@
-using System.Net;
+using System.Collections.Generic;
+using System.Net;
 
 namespace ArangoDBNetStandard.CollectionApi.Models
 {
@@ -47,7 +48,7 @@ public class GetCollectionPropertiesResponse
         /// which document attributes are used to determine the target shard for documents.
         /// This option is meaningless in a single server setup.
         /// </summary>
-        public string ShardKeys { get; set; }
+        public IEnumerable<string> ShardKeys { get; set; }
 
         /// <summary>
         /// In a cluster, this attribute determines how many copies

arangodb-net-standard/CollectionApi/Models/PostCollectionBody.cs

@@ -1,4 +1,6 @@
-namespace ArangoDBNetStandard.CollectionApi.Models
+using System.Collections.Generic;
+
+namespace ArangoDBNetStandard.CollectionApi.Models
 {
     public class PostCollectionBody
     {
@@ -93,7 +95,7 @@ public class PostCollectionBody
         /// Values of shard key attributes cannot be changed once set.
         /// This option is meaningless in a single server setup.
         /// </summary>
-        public string ShardKeys { get; set; }
+        public IEnumerable<string> ShardKeys { get; set; }
 
         /// <summary>
         /// This attribute specifies the name of the sharding strategy to use for the collection.