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Add filtering on null.

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This commit is contained in:
Kevin Dost 2020-10-23 18:15:58 +02:00
parent b47ed62f77
commit f39944d0e4
2 changed files with 61 additions and 14 deletions
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39
Sieve/Services/SieveProcessor.cs
View File

@ -56,6 +56,7 @@ namespace Sieve.Services
where TFilterTerm : IFilterTerm, new()
where TSortTerm : ISortTerm, new()
{
private const string nullFilterValue = "null";
private readonly IOptions<SieveOptions> _options;
private readonly ISieveCustomSortMethods _customSortMethods;
private readonly ISieveCustomFilterMethods _customFilterMethods;
@ -179,15 +180,14 @@ namespace Sieve.Services
var (fullPropertyName, property) = GetSieveProperty<TEntity>(false, true, filterTermName);
if (property != null)
{
var converter = TypeDescriptor.GetConverter(property.PropertyType);
Expression propertyValue = parameter;
Expression nullCheck = null;
foreach (var name in fullPropertyName.Split('.'))
var names = fullPropertyName.Split('.');
for (var i = 0; i < names.Length; i++)
{
propertyValue = Expression.PropertyOrField(propertyValue, name);
propertyValue = Expression.PropertyOrField(propertyValue, names[i]);
if (propertyValue.Type.IsNullable())
if (i != names.Length - 1 && propertyValue.Type.IsNullable())
{
nullCheck = GenerateFilterNullCheckExpression(propertyValue, nullCheck);
}
@ -195,15 +195,13 @@ namespace Sieve.Services
if (filterTerm.Values == null) continue;
var converter = TypeDescriptor.GetConverter(property.PropertyType);
foreach (var filterTermValue in filterTerm.Values)
{
dynamic constantVal = converter.CanConvertFrom(typeof(string))
? converter.ConvertFrom(filterTermValue)
: Convert.ChangeType(filterTermValue, property.PropertyType);
Expression filterValue = GetClosureOverConstant(constantVal, property.PropertyType);
var isFilterTermValueNull = filterTermValue.ToLower() == nullFilterValue;
var filterValue = isFilterTermValueNull
? Expression.Constant(null, property.PropertyType)
: ConvertStringValueToConstantExpression(filterTermValue, property, converter);
if (filterTerm.OperatorIsCaseInsensitive)
{
@ -223,9 +221,13 @@ namespace Sieve.Services
expression = Expression.Not(expression);
}
if (nullCheck != null)
var filterValueNullCheck = !isFilterTermValueNull && propertyValue.Type.IsNullable()
? GenerateFilterNullCheckExpression(propertyValue, nullCheck)
: nullCheck;
if (filterValueNullCheck != null)
{
expression = Expression.AndAlso(nullCheck, expression);
expression = Expression.AndAlso(filterValueNullCheck, expression);
}
if (innerExpression == null)
@ -272,6 +274,15 @@ namespace Sieve.Services
: Expression.AndAlso(nullCheckExpression, Expression.NotEqual(propertyValue, Expression.Default(propertyValue.Type)));
}
private Expression ConvertStringValueToConstantExpression(string value, PropertyInfo property, TypeConverter converter)
{
dynamic constantVal = converter.CanConvertFrom(typeof(string))
? converter.ConvertFrom(value)
: Convert.ChangeType(value, property.PropertyType);
return GetClosureOverConstant(constantVal, property.PropertyType);
}
private static Expression GetExpression(TFilterTerm filterTerm, dynamic filterValue, dynamic propertyValue)
{
switch (filterTerm.OperatorParsed)

36
SieveUnitTests/General.cs
View File

@ -528,5 +528,41 @@ namespace SieveUnitTests
Assert.AreEqual(sortedPosts[0].Id, 2);
Assert.AreEqual(sortedPosts[1].Id, 1);
}
[TestMethod]
public void FilteringOnNullWorks()
{
var posts = new List<Post>
{
new Post() {
Id = 1,
Title = null,
LikeCount = 0,
IsDraft = false,
CategoryId = null,
TopComment = null,
FeaturedComment = null
},
new Post() {
Id = 2,
Title = null,
LikeCount = 0,
IsDraft = false,
CategoryId = null,
TopComment = null,
FeaturedComment = new Comment { Id = 1, Text = null }
},
}.AsQueryable();
var model = new SieveModel()
{
Filters = "FeaturedComment.Text==null",
};
var result = _processor.Apply(model, posts);
Assert.AreEqual(1, result.Count());
var filteredPosts = result.ToList();
Assert.AreEqual(filteredPosts[0].Id, 2);
}
}
}