Prefix update to allow specifying if Prefix should be used on the different Query By parameters

src/Typesense/SearchParameters.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Text.Json.Serialization;
 using Typesense.Converter;
 
@@ -81,8 +82,41 @@ public record SearchParameters
     /// be treated as a prefix, and not as a whole word. This is used for building
     /// autocomplete and instant search interfaces. Defaults to true.
     /// </summary>
+    /// <remarks>Backwards compatible implementation for existing clients.</remarks>
+    [JsonPropertyName("_prefix")]
+    public bool? Prefix
+    {
+        get => PrefixList == null ? null : PrefixList.Count > 0 ? PrefixList[0] : null;
+        set
+        {
+            if (value != null) 
+            {
+                if (PrefixList == null)
+                {
+                    PrefixList = new List<bool>();
+                }
+                if(PrefixList.Count == 0)
+                {
+                    PrefixList.Add(value.Value);
+                }
+                else
+                {
+                    PrefixList[0] = value.Value!;
+                }
+            }
+        }
+    }
+
+    /// <summary>
+    /// List of boolean fields to indicate that the last word in the query should
+    /// be treated as a prefix, and not as a whole word. This is used for building
+    /// autocomplete and instant search interfaces. 
+    /// For example, if you are querying 3 fields and want to enable prefix searching only on the first field
+    /// you can set the prefix property to [true, false, false].
+    /// Defaults to true.
+    /// </summary>
     [JsonPropertyName("prefix")]
-    public bool? Prefix { get; set; }
+    public List<bool> PrefixList { get; set; }
 
     /// <summary>
     /// If infix index is enabled for this field, infix searching can be done on a per-field basis by sending a comma separated string parameter called infix to the search query.

src/Typesense/TypesenseClient.cs

@@ -781,6 +781,12 @@ private static string CreateUrlParameters<T>(T queryParameters)
                     null => null,
                     true => "true",
                     false => "false",
+                    List<bool> list => string.Join(",", 
+                        list.Select(v => v switch
+                        {
+                            true => "true",
+                            false => "false"
+                        })),
                     Enum e => e.ToString().ToLowerInvariant(),
                     _ => value.ToString(),
                 };

test/Typesense.Tests/TypesenseClientTests.cs

@@ -1500,6 +1500,62 @@ public async Task Search_query_by_two_fields()
         }
     }
 
+        [Fact, TestPriority(11)]
+        public async Task Search_query_with_prefix_true_should_work()
+        {
+            var expected = new Company
+            {
+                Id = "124",
+                CompanyName = "Stark Industries",
+                NumEmployees = 6000,
+                Location = new Location
+                {
+                    City = "Phoenix",
+                    Country = "USA"
+                },
+            };
+
+            var query = new SearchParameters("Stark", "company_name")
+            {
+                Prefix = true
+            };
+            var response = await _client.Search<Company>("companies", query);
+
+            using (var scope = new AssertionScope())
+            {
+                response.Found.Should().Be(1);
+                response.Hits.First().Document.Should().BeEquivalentTo(expected);
+            }
+        }
+
+        [Fact, TestPriority(11)]
+        public async Task Search_query_with_prefix_list_should_work()
+        {
+            var expected = new Company
+            {
+                Id = "124",
+                CompanyName = "Stark Industries",
+                NumEmployees = 6000,
+                Location = new Location
+                {
+                    City = "Phoenix",
+                    Country = "USA"
+                },
+            };
+
+            var query = new SearchParameters("Stark", "company_name,location.country")
+            {
+                PrefixList = new List<bool> { true, false }
+            };
+            var response = await _client.Search<Company>("companies", query);
+
+            using (var scope = new AssertionScope())
+            {
+                response.Found.Should().Be(1);
+                response.Hits.First().Document.Should().BeEquivalentTo(expected);
+            }
+        }
+
     [Fact, TestPriority(11)]
     public async Task Search_facet_by_country()
     {