public void Build_SpecificationBuilder_ShouldTransformAllQueryStringToExpressionTree()
{
// arrange
var builder = new ContainerBuilder();
builder.RegisterModule <ProductSpecificationFactoryModule>();
builder.RegisterModule <SpecificationModule>();
builder.RegisterType <ProductSpecificationBuilder>().As <ISpecificationBuilder <Product> >().InstancePerLifetimeScope();
builder.RegisterType <ProductSpecificationBuilderClient>().InstancePerLifetimeScope();
// queryString Dummy
NameValueCollection qsDummy = HttpUtility.ParseQueryString("?category=1&subcategory=3&keyword=test&reviewscore=3&maxprice=300&minprice=200");
// expectedResult
ISpecification <Product> expectedSpecification = new BaseSpecification <Product>()
.And(new IncludeCategorySpecification("1"))
.And(new IncludeSubCategorySpecification("3"))
.And(new IncludeKeyWordSpecification("test"))
.And(new IncludeReviewScoreSpecification("3"))
.And(new PriceIsLessThanOrEqualSpecification("300"))
.And(new PriceIsMoreThanOrEqualSpecification("200"));
using (var container = builder.Build())
using (var scope = container.BeginLifetimeScope())
{
ProductSpecificationBuilderClient client = scope.Resolve <ProductSpecificationBuilderClient>();
Expression <Func <Product, bool> > result = client.Build(qsDummy);
// you can display content of expression tree. just use ToString()
//Expression<Func<int, bool>> expression = n => n > 5 && n < 3;
//_output.WriteLine(expression.ToString());
_output.WriteLine(result.ToString());
// assert
Assert.Equal(expectedSpecification.ToExpression().ToString(), result.ToString());
}
}
public IEnumerable <TEntity> Find(BaseSpecification <TEntity> specification)
{
return(_context.Query <TEntity>()
.Where(specification.ToExpression()));
}