Adding an example showing reuse of predicates

ardalis · Dec 11, 2023 · b11148c · b11148c
1 parent de3c012
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diff --git a/sample/Ardalis.Sample.Domain/Specs/AdultCustomersByNameSpec.cs b/sample/Ardalis.Sample.Domain/Specs/AdultCustomersByNameSpec.cs
@@ -0,0 +1,12 @@
+using Ardalis.Specification;
+
+namespace Ardalis.Sample.Domain.Specs;
+
+public class AdultCustomersByNameSpec : Specification<Customer>
+{
+    public AdultCustomersByNameSpec(string nameSubstring)
+    {
+        Query.Where(c => CustomerPredicates.IsAdult(c) &&
+             CustomerPredicates.NameIncludes(c, nameSubstring));
+    }
+}
diff --git a/sample/Ardalis.Sample.Domain/Specs/CustomerPredicates.cs b/sample/Ardalis.Sample.Domain/Specs/CustomerPredicates.cs
@@ -0,0 +1,9 @@
+namespace Ardalis.Sample.Domain.Specs;
+
+public static class CustomerPredicates
+{
+    public static Func<Customer, bool> IsAdult => customer => customer.Age >= 18;
+    public static Func<Customer, int, bool> IsAtLeastYearsOld => (customer, years) => customer.Age >= years;
+    public static Func<Customer, string, bool> NameIncludes => 
+        (customer, nameString) => customer.Name.Contains(nameString, StringComparison.CurrentCultureIgnoreCase);
+}