Merge #528

528: Implements show ranking scores in search query r=curquiza a=massijay

# Pull Request

## Related issue
Fixes #458 

## What does this PR do?
- Implements show ranking scores in search query
- Does not implement a user friendly way to retrieve the score in the response (impossible to do without making breaking changes, see also #315, #426) users have to add the field in their classes themselves

## PR checklist
Please check if your PR fulfills the following requirements:
- [x] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
- [x] Have you read the contributing guidelines?
- [x] Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!


Co-authored-by: Massimiliano Cristarella <m.cristarella@outlook.com>
Co-authored-by: Massimiliano Cristarella <massijay@outlook.com>
Co-authored-by: Clémentine U. - curqui <clementine@meilisearch.com>

.code-samples.meilisearch.yaml

@@ -738,9 +738,15 @@ search_parameter_guide_matching_strategy_1: |-
 search_parameter_guide_matching_strategy_2: |-
   SearchQuery params = new SearchQuery() { MatchingStrategy = "all" };
   await client.Index("movies").SearchAsync<Game>("big fat liar", params);
+search_parameter_guide_show_ranking_score_1: |-
+  var params = new SearchQuery()
+  {
+    ShowRankingScore = true
+  };
+  await client.Index("movies").SearchAsync<MovieWithRankingScore>("dragon", params);
 get_proximity_precision_settings_1: |-
   await client.Index("books").GetProximityPrecisionAsync();
 update_proximity_precision_settings_1: |-
   await client.Index("books").UpdateProximityPrecisionAsync("byAttribute");
 reset_proximity_precision_settings_1: |-
-  await client.Index("books").ResetProximityPrecisionAsync();
+  await client.Index("books").ResetProximityPrecisionAsync();

src/Meilisearch/SearchQuery.cs

@@ -98,6 +98,12 @@ public class SearchQuery
         [JsonPropertyName("matchingStrategy")]
         public string MatchingStrategy { get; set; }
 
+        /// <summary>
+        /// Gets or sets showRankingScore parameter. It defines wheter the global ranking score of a document (between 0 and 1) is returned or not.
+        /// </summary>
+        [JsonPropertyName("showRankingScore")]
+        public bool? ShowRankingScore { get; set; }
+
         // pagination:
 
         /// <summary>

tests/Meilisearch.Tests/Movie.cs

@@ -46,4 +46,14 @@ public class FormattedMovie
 #pragma warning disable SA1300
         public Movie _Formatted { get; set; }
     }
+
+    public class MovieWithRankingScore
+    {
+        public string Id { get; set; }
+
+        public string Name { get; set; }
+
+        public string Genre { get; set; }
+        public double? _RankingScore { get; set; }
+    }
 }

tests/Meilisearch.Tests/SearchTests.cs

@@ -492,5 +492,16 @@ public async Task CustomSearchWithMatchingStrategyLast()
 
             Assert.True(movies.Hits.Count() > 1);
         }
+
+        [Fact]
+        public async Task CustomSearchWithShowRankingScore()
+        {
+            var searchQuery = new SearchQuery()
+            {
+                ShowRankingScore = true
+            };
+            var movies = await _basicIndex.SearchAsync<MovieWithRankingScore>("iron man", searchQuery);
+            Assert.NotNull(movies.Hits.First()._RankingScore);
+        }
     }
 }