initial commit

ConfigBackEnd/Extensions/IQueryableExtensions.cs

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+namespace Indotalent.ConfigBackEnd.Extensions;
+
+using Indotalent.Data.Interfaces;
+using Indotalent.Shared.Models;
+using Microsoft.EntityFrameworkCore;
+using System.Linq.Expressions;
+
+public static class IQueryableExtensions
+{
+    public static IQueryable<T> WhereIf<T>(
+        this IQueryable<T> query,
+        bool condition,
+        Expression<Func<T, bool>> predicate)
+    {
+        return condition ? query.Where(predicate) : query;
+    }
+
+    public static async Task<PagedList<T>> ToPagedListAsync<T>(
+            this IQueryable<T> query,
+            int skip,
+            int top)
+    {
+        top = top <= 0 ? 5 : top;
+        skip = skip < 0 ? 0 : skip;
+
+        var count = await query.CountAsync();
+
+        var items = await query
+            .Skip(skip)
+            .Take(top)
+            .ToListAsync();
+
+        return new PagedList<T>(items, count, skip, top);
+    }
+
+    public static IQueryable<T> OrderByPropertyName<T>(
+        this IQueryable<T> query,
+        string? propertyName,
+        bool isDescending)
+    {
+        if (string.IsNullOrWhiteSpace(propertyName)) return query;
+
+        var parameter = Expression.Parameter(typeof(T), "x");
+        var property = Expression.Property(parameter, propertyName);
+        var lambda = Expression.Lambda(property, parameter);
+
+        var methodName = isDescending ? "OrderByDescending" : "OrderBy";
+        var resultExpression = Expression.Call(
+            typeof(Queryable),
+            methodName,
+            new Type[] { typeof(T), property.Type },
+            query.Expression,
+            Expression.Quote(lambda));
+
+        return query.Provider.CreateQuery<T>(resultExpression);
+    }
+
+    public static IQueryable<T> NotDeletedOnly<T>(this IQueryable<T> query)
+        where T : class, IHasIsDeleted
+    {
+        return query.Where(x => !x.IsDeleted);
+    }
+}