(refactor): linq predicate test improvement

src/MaksIT.Core.Tests/Webapi/Models/PagedRequestTests.cs

@@ -144,6 +144,20 @@ public class PagedRequestTests {
     Assert.Single(filtered); // Assuming only "John" starts with "Jo"
   }
 
+  [Fact]
+  public void BuildFilterExpression_ShouldHandleEqualsAndContainsOperators() {
+    var queryable = GetTestQueryable();
+    var request = new PagedRequest {
+      Filters = "Age == \"31\" && (Name.Contains(\"Jo\"))"
+    };
+
+    var predicate = request.BuildFilterExpression<TestEntity>();
+    var filtered = queryable.Where(predicate).ToList();
+
+    Assert.Contains(filtered, t => t.Name.StartsWith("Jo"));
+    Assert.Single(filtered); // Assuming only "John" starts with "Jo"
+  }
+
   [Fact]
   public void BuildFilterExpression_ShouldHandleEndsWithOperator() {
     var queryable = GetTestQueryable();

src/MaksIT.Core/MaksIT.Core.csproj

@@ -8,7 +8,7 @@
 
     <!-- NuGet package metadata -->
     <PackageId>MaksIT.Core</PackageId>
-    <Version>1.3.1</Version>
+    <Version>1.3.3</Version>
     <Authors>Maksym Sadovnychyy</Authors>
     <Company>MAKS-IT</Company>
     <Product>MaksIT.Core</Product>

src/MaksIT.Core/Webapi/Models/PagedRequest.cs

@@ -15,16 +15,35 @@ public class PagedRequest : RequestModelBase {
     if (string.IsNullOrWhiteSpace(Filters))
       return x => true; // Returns an expression that doesn't filter anything.
 
-    // Adjust Filters to make Contains, StartsWith, EndsWith, ==, and != case-insensitive
-    string adjustedFilters = Filters
-        .Replace(".Contains(", ".ToLower().Contains(")
-        .Replace(".StartsWith(", ".ToLower().StartsWith(")
-        .Replace(".EndsWith(", ".ToLower().EndsWith(")
-        .Replace("==", ".ToLower() ==")
-        .Replace("!=", ".ToLower() !=");
+    // Get the type of T
+    var type = typeof(T);
 
-    // Ensure values are also transformed to lowercase
-    adjustedFilters = Regex.Replace(adjustedFilters, "\"([^\"]+)\"", m => $"\"{m.Groups[1].Value.ToLower()}\"");
+    // Adjust Filters to make Contains, StartsWith, EndsWith, ==, and != case-insensitive
+    string adjustedFilters = Filters;
+
+    // Regex to find property names and methods
+    adjustedFilters = Regex.Replace(adjustedFilters, @"(\w+)\.(Contains|StartsWith|EndsWith)\(\""(.*?)\""\)", m => {
+      var propertyName = m.Groups[1].Value;
+      var method = m.Groups[2].Value;
+      var value = m.Groups[3].Value;
+      var property = type.GetProperty(propertyName);
+      if (property != null && property.PropertyType == typeof(string)) {
+        return $"{propertyName}.ToLower().{method}(\"{value.ToLower()}\")";
+      }
+      return m.Value;
+    });
+
+    // Regex to find equality and inequality comparisons
+    adjustedFilters = Regex.Replace(adjustedFilters, @"(\w+)\s*(==|!=)\s*\""(.*?)\""", m => {
+      var propertyName = m.Groups[1].Value;
+      var comparison = m.Groups[2].Value;
+      var value = m.Groups[3].Value;
+      var property = type.GetProperty(propertyName);
+      if (property != null && property.PropertyType == typeof(string)) {
+        return $"{propertyName}.ToLower() {comparison} \"{value.ToLower()}\"";
+      }
+      return m.Value;
+    });
 
     // Parse the adjusted filter string into a dynamic lambda expression
     var predicate = DynamicExpressionParser.ParseLambda<T, bool>(