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Merge pull request #95 from kevindost/fix/accessing-null-members

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Fix issue where sorting or filtering a collection fails on accesssing null members.
This commit is contained in:
Ashish Patel 2020-10-23 02:00:48 +05:30 committed by GitHub
commit b47ed62f77
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4 changed files with 150 additions and 32 deletions
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64
Sieve/Extensions/OrderByDynamic.cs
View File

@ -1,36 +1,62 @@
using System;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
namespace Sieve.Extensions
{
public static partial class LinqExtentions
public static partial class LinqExtensions
{
public static IQueryable<TEntity> OrderByDynamic<TEntity>(this IQueryable<TEntity> source, string fullPropertyName, PropertyInfo propertyInfo,
bool desc, bool useThenBy)
public static IQueryable<TEntity> OrderByDynamic<TEntity>(
this IQueryable<TEntity> source,
string fullPropertyName,
bool desc,
bool useThenBy)
{
string command = desc ?
(useThenBy ? "ThenByDescending" : "OrderByDescending") :
(useThenBy ? "ThenBy" : "OrderBy");
var type = typeof(TEntity);
var parameter = Expression.Parameter(type, "p");
var lambda = GenerateLambdaWithSafeMemberAccess<TEntity>(fullPropertyName);
dynamic propertyValue = parameter;
if (fullPropertyName.Contains("."))
var command = desc
? (useThenBy ? "ThenByDescending" : "OrderByDescending")
: (useThenBy ? "ThenBy" : "OrderBy");
var resultExpression = Expression.Call(
typeof(Queryable),
command,
new Type[] { typeof(TEntity), lambda.ReturnType },
source.Expression,
Expression.Quote(lambda));
return source.Provider.CreateQuery<TEntity>(resultExpression);
}
private static Expression<Func<TEntity, object>> GenerateLambdaWithSafeMemberAccess<TEntity>(string fullPropertyName)
{
var parameter = Expression.Parameter(typeof(TEntity), "e");
Expression propertyValue = parameter;
Expression nullCheck = null;
foreach (var name in fullPropertyName.Split('.'))
{
var parts = fullPropertyName.Split('.');
for (var i = 0; i < parts.Length - 1; i++)
propertyValue = Expression.PropertyOrField(propertyValue, name);
if (propertyValue.Type.IsNullable())
{
propertyValue = Expression.PropertyOrField(propertyValue, parts[i]);
nullCheck = GenerateOrderNullCheckExpression(propertyValue, nullCheck);
}
}
var propertyAccess = Expression.MakeMemberAccess(propertyValue, propertyInfo);
var orderByExpression = Expression.Lambda(propertyAccess, parameter);
var resultExpression = Expression.Call(typeof(Queryable), command, new Type[] { type, propertyInfo.PropertyType },
source.Expression, Expression.Quote(orderByExpression));
return source.Provider.CreateQuery<TEntity>(resultExpression);
var expression = nullCheck == null
? propertyValue
: Expression.Condition(nullCheck, Expression.Default(propertyValue.Type), propertyValue);
var converted = Expression.Convert(expression, typeof(object));
return Expression.Lambda<Func<TEntity, object>>(converted, parameter);
}
private static Expression GenerateOrderNullCheckExpression(Expression propertyValue, Expression nullCheckExpression)
{
return nullCheckExpression == null
? Expression.Equal(propertyValue, Expression.Default(propertyValue.Type))
: Expression.OrElse(nullCheckExpression, Expression.Equal(propertyValue, Expression.Default(propertyValue.Type)));
}
}
}

12
Sieve/Extensions/TypeExtensions.cs Normal file
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@ -0,0 +1,12 @@
using System;
namespace Sieve.Extensions
{
public static partial class TypeExtensions
{
public static bool IsNullable(this Type type)
{
return !type.IsValueType || Nullable.GetUnderlyingType(type) != null;
}
}
}

44
Sieve/Services/SieveProcessor.cs
View File

@ -170,21 +170,27 @@ namespace Sieve.Services
}
Expression outerExpression = null;
var parameterExpression = Expression.Parameter(typeof(TEntity), "e");
var parameter = Expression.Parameter(typeof(TEntity), "e");
foreach (var filterTerm in model.GetFiltersParsed())
{
Expression innerExpression = null;
foreach (var filterTermName in filterTerm.Names)
{
var (fullName, property) = GetSieveProperty<TEntity>(false, true, filterTermName);
var (fullPropertyName, property) = GetSieveProperty<TEntity>(false, true, filterTermName);
if (property != null)
{
var converter = TypeDescriptor.GetConverter(property.PropertyType);
Expression propertyValue = parameter;
Expression nullCheck = null;
dynamic propertyValue = parameterExpression;
foreach (var part in fullName.Split('.'))
foreach (var name in fullPropertyName.Split('.'))
{
propertyValue = Expression.PropertyOrField(propertyValue, part);
propertyValue = Expression.PropertyOrField(propertyValue, name);
if (propertyValue.Type.IsNullable())
{
nullCheck = GenerateFilterNullCheckExpression(propertyValue, nullCheck);
}
}
if (filterTerm.Values == null) continue;
@ -217,6 +223,11 @@ namespace Sieve.Services
expression = Expression.Not(expression);
}
if (nullCheck != null)
{
expression = Expression.AndAlso(nullCheck, expression);
}
if (innerExpression == null)
{
innerExpression = expression;
@ -251,7 +262,14 @@ namespace Sieve.Services
}
return outerExpression == null
? result
: result.Where(Expression.Lambda<Func<TEntity, bool>>(outerExpression, parameterExpression));
: result.Where(Expression.Lambda<Func<TEntity, bool>>(outerExpression, parameter));
}
private static Expression GenerateFilterNullCheckExpression(Expression propertyValue, Expression nullCheckExpression)
{
return nullCheckExpression == null
? Expression.NotEqual(propertyValue, Expression.Default(propertyValue.Type))
: Expression.AndAlso(nullCheckExpression, Expression.NotEqual(propertyValue, Expression.Default(propertyValue.Type)));
}
private static Expression GetExpression(TFilterTerm filterTerm, dynamic filterValue, dynamic propertyValue)
@ -311,7 +329,7 @@ namespace Sieve.Services
if (property != null)
{
result = result.OrderByDynamic(fullName, property, sortTerm.Descending, useThenBy);
result = result.OrderByDynamic(fullName, sortTerm.Descending, useThenBy);
}
else
{
@ -373,12 +391,12 @@ namespace Sieve.Services
bool isCaseSensitive)
{
return Array.Find(typeof(TEntity).GetProperties(), p =>
{
return p.GetCustomAttribute(typeof(SieveAttribute)) is SieveAttribute sieveAttribute
&& (canSortRequired ? sieveAttribute.CanSort : true)
&& (canFilterRequired ? sieveAttribute.CanFilter : true)
&& ((sieveAttribute.Name ?? p.Name).Equals(name, isCaseSensitive ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase));
});
{
return p.GetCustomAttribute(typeof(SieveAttribute)) is SieveAttribute sieveAttribute
&& (!canSortRequired || sieveAttribute.CanSort)
&& (!canFilterRequired || sieveAttribute.CanFilter)
&& (sieveAttribute.Name ?? p.Name).Equals(name, isCaseSensitive ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase);
});
}
private IQueryable<TEntity> ApplyCustomMethod<TEntity>(IQueryable<TEntity> result, string name, object parent, object[] parameters, object[] optionalParameters = null)

62
SieveUnitTests/General.cs
View File

@ -466,5 +466,67 @@ namespace SieveUnitTests
result = _processor.Apply(model, _posts);
Assert.AreEqual(1, result.Count());
}
[TestMethod]
public void FilteringNullsWorks()
{
var posts = new List<Post>
{
new Post() {
Id = 1,
Title = null,
LikeCount = 0,
IsDraft = false,
CategoryId = null,
TopComment = null,
FeaturedComment = null
},
}.AsQueryable();
var model = new SieveModel()
{
Filters = "FeaturedComment.Text!@=Some value",
};
var result = _processor.Apply(model, posts);
Assert.AreEqual(0, result.Count());
}
[TestMethod]
public void SortingNullsWorks()
{
var posts = new List<Post>
{
new Post() {
Id = 1,
Title = null,
LikeCount = 0,
IsDraft = false,
CategoryId = null,
TopComment = new Comment { Id = 1 },
FeaturedComment = null
},
new Post() {
Id = 2,
Title = null,
LikeCount = 0,
IsDraft = false,
CategoryId = null,
TopComment = null,
FeaturedComment = null
},
}.AsQueryable();
var model = new SieveModel()
{
Sorts = "TopComment.Id",
};
var result = _processor.Apply(model, posts);
Assert.AreEqual(2, result.Count());
var sortedPosts = result.ToList();
Assert.AreEqual(sortedPosts[0].Id, 2);
Assert.AreEqual(sortedPosts[1].Id, 1);
}
}
}