XSpecification.Linq 1.0.0

XSpecification is an implementation of Specification pattern for Linq and Elasticsearch

Setup

Formalize your filter

public class LinqTestFilter
{
   public int Id { get; set; }
   public RangeFilter<int> RangeId { get; set; }
}

Create your scpecification

public class LinqTestSpec : SpecificationBase<LinqTestModel, LinqTestFilter>
{
    public LinqTestSpec(ILogger<LinqTestSpec> logger, IOptions<Options> options)
        : base(logger, options)
    {
        HandleField(f => f.Explicit, m => m.UnmatchingProperty);
    }
}

Add XSpecification to your DI in Startup.cs or Program.cs

services.AddLinqSpecification();
//or optionally disable auto property handling
services.AddLinqSpecification(o =>
            {
                o.DisableAutoPropertyHandling = true;
            });
// add scpecification to your DI
services.AddSingleton<LinqTestSpec>();

Using in your code

// Inject from DI
var spec = serviceProvider.GetRequiredService<LinqTestSpec>();

var filter = new LinqTestFilter
{
    Date = DateTime.Today,
    Id = 123,
    Name = "qwe",
    ComplexName = new StringFilter("complex") { Contains = true },
    ListDate = new[] { DateTime.Today, DateTime.Today.AddDays(1) },
    ListId = new[] { 1, 2, 3 },
    ListName = new[] { "a", "b", "z" },
    NullableDate = DateTime.Today.AddDays(-1),
    RangeDate = new RangeFilter<DateTime> { Start = DateTime.Today, End = DateTime.Today.AddDays(1) },
    RangeId = new RangeFilter<int> { Start = 0, End = 5 }
};

var expression = spec.CreateFilterExpression(filter);

var data = dbcontext.Set<LinqTestModel>().Where(expression);

TODO

• Add extension points for new filter types
• Refactor Expression creation logic to Chain of responsipility
• Add Elasticsearch implementation