(feature): New expression extension methods

src/MaksIT.Core.Tests/Extensions/ExpressionExtensionsTests.cs

@@ -6,14 +6,15 @@ using MaksIT.Core.Extensions;
 namespace MaksIT.Core.Tests.Extensions;
 
 public class ExpressionExtensionsTests {
+
   [Fact]
-  public void CombineWith_ShouldCombineTwoPredicates() {
+  public void AndAlso_ShouldCombineTwoPredicatesWithAndCondition() {
     // Arrange
     Expression<Func<TestEntity, bool>> firstPredicate = x => x.Age > 18;
     Expression<Func<TestEntity, bool>> secondPredicate = x => (x.Name ?? "").StartsWith("A");
 
     // Act
-    var combinedPredicate = firstPredicate.CombineWith(secondPredicate);
+    var combinedPredicate = firstPredicate.AndAlso(secondPredicate);
     var compiledPredicate = combinedPredicate.Compile();
 
     // Assert
@@ -22,10 +23,98 @@ public class ExpressionExtensionsTests {
     Assert.False(compiledPredicate(new TestEntity { Age = 20, Name = "Bob" }));
   }
 
+  [Fact]
+  public void OrElse_ShouldCombineTwoPredicatesWithOrCondition() {
+    // Arrange
+    Expression<Func<TestEntity, bool>> firstPredicate = x => x.Age > 18;
+    Expression<Func<TestEntity, bool>> secondPredicate = x => (x.Name ?? "").StartsWith("A");
+
+    // Act
+    var combinedPredicate = firstPredicate.OrElse(secondPredicate);
+    var compiledPredicate = combinedPredicate.Compile();
+
+    // Assert
+    Assert.True(compiledPredicate(new TestEntity { Age = 20, Name = "Alice" }));
+    Assert.True(compiledPredicate(new TestEntity { Age = 17, Name = "Alice" }));
+    Assert.True(compiledPredicate(new TestEntity { Age = 20, Name = "Bob" }));
+    Assert.False(compiledPredicate(new TestEntity { Age = 17, Name = "Bob" }));
+  }
+
+  [Fact]
+  public void Not_ShouldNegatePredicate() {
+    // Arrange
+    Expression<Func<TestEntity, bool>> predicate = x => x.Age > 18;
+
+    // Act
+    var negatedPredicate = predicate.Not();
+    var compiledPredicate = negatedPredicate.Compile();
+
+    // Assert
+    Assert.False(compiledPredicate(new TestEntity { Age = 20 }));
+    Assert.True(compiledPredicate(new TestEntity { Age = 17 }));
+  }
+
+  [Fact]
+  public void AndAlso_ShouldHandleNullValues() {
+    // Arrange
+    Expression<Func<TestEntity, bool>> firstPredicate = x => x.Name != null;
+    Expression<Func<TestEntity, bool>> secondPredicate = x => (x.Name ?? "").Length > 3;
+
+    // Act
+    var combinedPredicate = firstPredicate.AndAlso(secondPredicate);
+    var compiledPredicate = combinedPredicate.Compile();
+
+    // Assert
+    Assert.False(compiledPredicate(new TestEntity { Name = null }));
+    Assert.True(compiledPredicate(new TestEntity { Name = "John" }));
+  }
+
+  [Fact]
+  public void Not_ShouldThrowExceptionForNullExpression() {
+    // Act & Assert
+    Assert.Throws<ArgumentNullException>(() => ExpressionExtensions.Not<TestEntity>(null!));
+  }
+
+  [Fact]
+  public void AndAlso_ShouldThrowExceptionForNullExpression() {
+    // Arrange
+    Expression<Func<TestEntity, bool>> firstPredicate = null!;
+    Expression<Func<TestEntity, bool>> secondPredicate = x => x.Age > 18;
+
+    // Act & Assert
+    Assert.Throws<ArgumentNullException>(() => firstPredicate.AndAlso(secondPredicate));
+  }
+
+  [Fact]
+  public void OrElse_ShouldThrowExceptionForNullExpression() {
+    // Arrange
+    Expression<Func<TestEntity, bool>> firstPredicate = x => x.Age > 18;
+    Expression<Func<TestEntity, bool>> secondPredicate = null!;
+
+    // Act & Assert
+    Assert.Throws<ArgumentNullException>(() => firstPredicate.OrElse(secondPredicate));
+  }
+
+  [Fact]
+  public void Batch_ShouldDivideCollectionIntoBatchesOfGivenSize() {
+    // Arrange
+    var source = Enumerable.Range(1, 10);
+    int batchSize = 3;
+
+    // Act
+    var batches = source.Batch(batchSize).ToList();
+
+    // Assert
+    Assert.Equal(4, batches.Count);
+    Assert.Equal(new List<int> { 1, 2, 3 }, batches[0]);
+    Assert.Equal(new List<int> { 4, 5, 6 }, batches[1]);
+    Assert.Equal(new List<int> { 7, 8, 9 }, batches[2]);
+    Assert.Equal(new List<int> { 10 }, batches[3]);
+  }
+
   private class TestEntity {
     public Guid Id { get; set; }
     public int Age { get; set; }
     public string? Name { get; set; }
   }
-}
+}
-

src/MaksIT.Core.Tests/MaksIT.Core.Tests.csproj

@@ -10,13 +10,13 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="coverlet.collector" Version="6.0.2">
+    <PackageReference Include="coverlet.collector" Version="6.0.3">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
-    <PackageReference Include="xunit" Version="2.9.2" />
+    <PackageReference Include="xunit" Version="2.9.3" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.0.1">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>

src/MaksIT.Core/Extensions/ExpressionExtensions.cs

@@ -1,14 +1,14 @@
-using System;
+using System.Linq.Expressions;
-using System.Collections.Generic;
-using System.Linq;
-using System.Linq.Expressions;
 
 
 namespace MaksIT.Core.Extensions;
 
 public static class ExpressionExtensions {
 
-  public static Expression<Func<T, bool>> CombineWith<T>(this Expression<Func<T, bool>> first, Expression<Func<T, bool>> second) {
+  public static Expression<Func<T, bool>> AndAlso<T>(this Expression<Func<T, bool>> first, Expression<Func<T, bool>> second) {
+    ArgumentNullException.ThrowIfNull(first);
+    ArgumentNullException.ThrowIfNull(second);
+
     var parameter = first.Parameters[0];
     var visitor = new SubstituteParameterVisitor(second.Parameters[0], parameter);
     var secondBody = visitor.Visit(second.Body);
@@ -17,6 +17,27 @@ public static class ExpressionExtensions {
     return Expression.Lambda<Func<T, bool>>(combinedBody, parameter);
   }
 
+  public static Expression<Func<T, bool>> OrElse<T>(this Expression<Func<T, bool>> first, Expression<Func<T, bool>> second) {
+    ArgumentNullException.ThrowIfNull(first);
+    ArgumentNullException.ThrowIfNull(second);
+
+    var parameter = first.Parameters[0];
+    var visitor = new SubstituteParameterVisitor(second.Parameters[0], parameter);
+    var secondBody = visitor.Visit(second.Body);
+    var combinedBody = Expression.OrElse(first.Body, secondBody);
+
+    return Expression.Lambda<Func<T, bool>>(combinedBody, parameter);
+  }
+
+  public static Expression<Func<T, bool>> Not<T>(this Expression<Func<T, bool>> expression) {
+    if (expression == null) throw new ArgumentNullException(nameof(expression));
+
+    var parameter = expression.Parameters[0];
+    var body = Expression.Not(expression.Body);
+
+    return Expression.Lambda<Func<T, bool>>(body, parameter);
+  }
+
   private class SubstituteParameterVisitor : ExpressionVisitor {
     private readonly ParameterExpression _oldParameter;
     private readonly ParameterExpression _newParameter;
@@ -31,4 +52,21 @@ public static class ExpressionExtensions {
       return node == _oldParameter ? _newParameter : base.VisitParameter(node);
     }
   }
+
+  public static IEnumerable<List<T>> Batch<T>(this IEnumerable<T> source, int batchSize) {
+    var batch = new List<T>(batchSize);
+    foreach (var item in source) {
+      batch.Add(item);
+      if (batch.Count == batchSize) {
+        yield return batch;
+        batch = new List<T>(batchSize);
+      }
+    }
+    if (batch.Any()) {
+      yield return batch;
+    }
+  }
+
+
+
 }

src/MaksIT.Core/MaksIT.Core.csproj

@@ -8,7 +8,7 @@
 
     <!-- NuGet package metadata -->
     <PackageId>MaksIT.Core</PackageId>
-    <Version>1.3.4</Version>
+    <Version>1.3.5</Version>
     <Authors>Maksym Sadovnychyy</Authors>
     <Company>MAKS-IT</Company>
     <Product>MaksIT.Core</Product>

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

@@ -13,14 +13,18 @@ public class PagedRequest : RequestModelBase {
   public bool IsAscending { get; set; } = true;
 
   public Expression<Func<T, bool>> BuildFilterExpression<T>() {
-    if (string.IsNullOrWhiteSpace(Filters))
+    return BuildFilterExpression<T>(Filters);
+  }
+
+  public virtual Expression<Func<T, bool>> BuildFilterExpression<T>(string? filters) {
+    if (string.IsNullOrWhiteSpace(filters))
       return x => true; // Returns an expression that doesn't filter anything.
 
     // Get the type of T
     var type = typeof(T);
 
     // Adjust Filters to make Contains, StartsWith, EndsWith, ==, and != case-insensitive
-    string adjustedFilters = Filters;
+    string adjustedFilters = filters;
 
     // Regex to find property names and methods
     adjustedFilters = Regex.Replace(adjustedFilters, @"(\w+)\.(Contains|StartsWith|EndsWith)\(\""(.*?)\""\)", m => {