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select works just need to add null checks.

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This commit is contained in:
David Lebée 2018-03-21 22:15:45 -05:00
parent 57fbee664e
commit 8f35c2a377
4 changed files with 77 additions and 30 deletions
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26
PoweredSoft.DynamicLinq.Test/SelectTests.cs
View File

@ -14,15 +14,19 @@ namespace PoweredSoft.DynamicLinq.Test
[TestMethod] [TestMethod]
public void TestSelect() public void TestSelect()
{ {
var regularSyntax = TestData.Authors var regularSyntaxA = TestData.Authors
.AsQueryable() .AsQueryable()
.Select(t => new .Select(t => new
{ {
Id = t.Id, Id = t.Id,
AuthorFirstName = t.FirstName, AuthorFirstName = t.FirstName,
AuthorLastName = t.LastName, AuthorLastName = t.LastName,
Posts = t.Posts.ToList() Posts = t.Posts.ToList(),
}).ToList(); Comments = t.Posts.Select(t2 => t2.Comments).ToList(),
Comments2 = t.Posts.SelectMany(t2 => t2.Comments).ToList()
});
//var regularSyntax = regularSyntaxA.ToList();
var dynamicSyntax = TestData.Authors var dynamicSyntax = TestData.Authors
.AsQueryable() .AsQueryable()
@ -32,8 +36,12 @@ namespace PoweredSoft.DynamicLinq.Test
t.Path("FirstName", "AuthorFirstName"); t.Path("FirstName", "AuthorFirstName");
t.Path("LastName", "AuthorLastName"); t.Path("LastName", "AuthorLastName");
t.PathToList("Posts"); t.PathToList("Posts");
}).ToDynamicClassList(); t.PathToList("Posts.Comments");
t.PathToList("Posts.Comments", "Comments2", SelectCollectionHandling.SelectMany);
})
.ToDynamicClassList();
/*
Assert.AreEqual(regularSyntax.Count, dynamicSyntax.Count); Assert.AreEqual(regularSyntax.Count, dynamicSyntax.Count);
for(var i = 0; i < regularSyntax.Count; i++) for(var i = 0; i < regularSyntax.Count; i++)
{ {
@ -41,7 +49,15 @@ namespace PoweredSoft.DynamicLinq.Test
Assert.AreEqual(regularSyntax[i].AuthorFirstName, dynamicSyntax[i].GetDynamicPropertyValue<string>("AuthorFirstName")); Assert.AreEqual(regularSyntax[i].AuthorFirstName, dynamicSyntax[i].GetDynamicPropertyValue<string>("AuthorFirstName"));
Assert.AreEqual(regularSyntax[i].AuthorLastName, dynamicSyntax[i].GetDynamicPropertyValue<string>("AuthorLastName")); Assert.AreEqual(regularSyntax[i].AuthorLastName, dynamicSyntax[i].GetDynamicPropertyValue<string>("AuthorLastName"));
Helpers.QueryableAssert.AreEqual(regularSyntax[i].Posts.AsQueryable(), dynamicSyntax[i].GetDynamicPropertyValue<List<Post>>("Posts").AsQueryable()); Helpers.QueryableAssert.AreEqual(regularSyntax[i].Posts.AsQueryable(), dynamicSyntax[i].GetDynamicPropertyValue<List<Post>>("Posts").AsQueryable());
} //Helpers.QueryableAssert.AreEqual(regularSyntax[i].Comments.AsQueryable(), dynamicSyntax[i].GetDynamicPropertyValue<List<Comment>>("Comments").AsQueryable());
}*/
}
[TestMethod]
public void SelectNullChecking()
{
// TODO: null checking in select operations :D
throw new Exception("TODO");
} }
} }
} }

6
PoweredSoft.DynamicLinq/Constants.cs
View File

@ -53,6 +53,12 @@ namespace PoweredSoft.DynamicLinq
Path Path
} }
public enum SelectCollectionHandling
{
Select,
SelectMany
}
internal static class Constants internal static class Constants
{ {
internal static readonly MethodInfo GroupByMethod = typeof(Queryable).GetMethods().First(t => t.Name == "GroupBy"); internal static readonly MethodInfo GroupByMethod = typeof(Queryable).GetMethods().First(t => t.Name == "GroupBy");

8
PoweredSoft.DynamicLinq/Fluent/Select/SelectBuilder.cs
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@ -11,6 +11,7 @@ namespace PoweredSoft.DynamicLinq.Fluent
public string Path { get; set; } public string Path { get; set; }
public string PropertyName { get; set; } public string PropertyName { get; set; }
public SelectTypes SelectType { get; set; } public SelectTypes SelectType { get; set; }
public SelectCollectionHandling SelectCollectionHandling { get; set; }
} }
public class SelectBuilder : IQueryBuilder public class SelectBuilder : IQueryBuilder
@ -133,7 +134,7 @@ namespace PoweredSoft.DynamicLinq.Fluent
return this; return this;
} }
public SelectBuilder PathToList(string path, string propertyName = null) public SelectBuilder PathToList(string path, string propertyName = null, SelectCollectionHandling selectCollectionHandling = SelectCollectionHandling.Select)
{ {
if (propertyName == null) if (propertyName == null)
propertyName = path.Split('.').LastOrDefault(); propertyName = path.Split('.').LastOrDefault();
@ -144,7 +145,8 @@ namespace PoweredSoft.DynamicLinq.Fluent
{ {
Path = path, Path = path,
PropertyName = propertyName, PropertyName = propertyName,
SelectType = SelectTypes.PathToList SelectType = SelectTypes.PathToList,
SelectCollectionHandling = selectCollectionHandling
}); });
return this; return this;
@ -155,7 +157,7 @@ namespace PoweredSoft.DynamicLinq.Fluent
if (Empty) if (Empty)
throw new Exception("No select specified, please specify at least one select path"); throw new Exception("No select specified, please specify at least one select path");
var partsTuple = Parts.Select(t => (selectType: t.SelectType, propertyName: t.PropertyName, path: t.Path)).ToList(); var partsTuple = Parts.Select(t => (selectType: t.SelectType, propertyName: t.PropertyName, path: t.Path, selectCollectionHandling: t.SelectCollectionHandling)).ToList();
return QueryableHelpers.Select(Query, partsTuple, DestinationType); return QueryableHelpers.Select(Query, partsTuple, DestinationType);
} }
} }

57
PoweredSoft.DynamicLinq/Helpers/QueryableHelpers.cs
View File

@ -118,7 +118,7 @@ namespace PoweredSoft.DynamicLinq.Helpers
return result; return result;
} }
public static IQueryable Select(IQueryable query, List<(SelectTypes selectType, string propertyName, string path)> parts, Type destinationType = null) public static IQueryable Select(IQueryable query, List<(SelectTypes selectType, string propertyName, string path, SelectCollectionHandling selectCollectionHandling)> parts, Type destinationType = null)
{ {
// create parameter. // create parameter.
var queryType = query.ElementType; var queryType = query.ElementType;
@ -129,7 +129,7 @@ namespace PoweredSoft.DynamicLinq.Helpers
var partExpressions = new List<(Expression expression, string propertyName)>(); var partExpressions = new List<(Expression expression, string propertyName)>();
parts.ForEach(part => parts.ForEach(part =>
{ {
var partBodyExpression = CreateSelectExpression(query, parameter, part.selectType, part.path); var partBodyExpression = CreateSelectExpression(query, parameter, part.selectType, part.path, part.selectCollectionHandling);
fields.Add((partBodyExpression.Type, part.propertyName)); fields.Add((partBodyExpression.Type, part.propertyName));
partExpressions.Add((partBodyExpression, part.propertyName)); partExpressions.Add((partBodyExpression, part.propertyName));
}); });
@ -146,11 +146,11 @@ namespace PoweredSoft.DynamicLinq.Helpers
return result; return result;
} }
private static Expression CreateSelectExpressionForGrouping(IQueryable query, ParameterExpression parameter, SelectTypes selectType, string path) private static Expression CreateSelectExpressionForGrouping(IQueryable query, ParameterExpression parameter, SelectTypes selectType, string path, SelectCollectionHandling selectCollectionHandling)
{ {
if (selectType == SelectTypes.Key) if (selectType == SelectTypes.Key)
{ {
return ResolvePathForExpression(parameter, path); return ResolvePathForExpression(parameter, path, selectCollectionHandling);
} }
else if (selectType == SelectTypes.Count) else if (selectType == SelectTypes.Count)
{ {
@ -193,23 +193,23 @@ namespace PoweredSoft.DynamicLinq.Helpers
throw new NotSupportedException($"unkown select type {selectType}"); throw new NotSupportedException($"unkown select type {selectType}");
} }
private static Expression CreateSelectExpression(IQueryable query, ParameterExpression parameter, SelectTypes selectType, string path) private static Expression CreateSelectExpression(IQueryable query, ParameterExpression parameter, SelectTypes selectType, string path, SelectCollectionHandling selectCollectionHandling)
{ {
if (!IsGrouping(query)) if (!IsGrouping(query))
return CreateSelectExpressionRegular(query, parameter, selectType, path); return CreateSelectExpressionRegular(query, parameter, selectType, path, selectCollectionHandling);
return CreateSelectExpressionForGrouping(query, parameter, selectType, path); return CreateSelectExpressionForGrouping(query, parameter, selectType, path, selectCollectionHandling);
} }
private static Expression CreateSelectExpressionRegular(IQueryable query, ParameterExpression parameter, SelectTypes selectType, string path) private static Expression CreateSelectExpressionRegular(IQueryable query, ParameterExpression parameter, SelectTypes selectType, string path, SelectCollectionHandling selectCollectionHandling)
{ {
if (selectType == SelectTypes.Path) if (selectType == SelectTypes.Path)
{ {
return ResolvePathForExpression(parameter, path); return ResolvePathForExpression(parameter, path, selectCollectionHandling);
} }
else if (selectType == SelectTypes.PathToList) else if (selectType == SelectTypes.PathToList)
{ {
var expr = ResolvePathForExpression(parameter, path); var expr = ResolvePathForExpression(parameter, path, selectCollectionHandling);
var notGroupedType = expr.Type.GenericTypeArguments.FirstOrDefault(); var notGroupedType = expr.Type.GenericTypeArguments.FirstOrDefault();
if (notGroupedType == null) if (notGroupedType == null)
throw new Exception($"Path must be a Enumerable<T> but its a {expr.Type}"); throw new Exception($"Path must be a Enumerable<T> but its a {expr.Type}");
@ -241,20 +241,43 @@ namespace PoweredSoft.DynamicLinq.Helpers
return result; return result;
} }
internal static Expression InternalResolvePathExpression(ParameterExpression param, List<string> parts, SelectCollectionHandling selectCollectionHandling)
{
var isLast = parts.Count == 1;
var currentPart = parts.First();
var memberExpression = Expression.PropertyOrField(param, currentPart);
if (isLast)
return memberExpression;
if (!IsEnumerable(memberExpression))
return InternalResolvePathExpression(param, parts.Skip(1).ToList(), selectCollectionHandling);
// enumerable.
var listGenericArgumentType = memberExpression.Type.GetGenericArguments().First();
// sub param.
var innerParam = Expression.Parameter(listGenericArgumentType);
var innerExpression = InternalResolvePathExpression(innerParam, parts.Skip(1).ToList(), selectCollectionHandling);
var lambda = Expression.Lambda(innerExpression, innerParam);
if (selectCollectionHandling == SelectCollectionHandling.Select)
return Expression.Call(typeof(Enumerable), "Select", new Type[] { listGenericArgumentType, innerExpression.Type }, memberExpression, lambda);
return Expression.Call(typeof(Enumerable), "SelectMany", new Type[] { listGenericArgumentType, innerExpression.Type.GenericTypeArguments.First() }, memberExpression, lambda);
}
/// <summary> /// <summary>
/// Returns the right expression for a path supplied. /// Returns the right expression for a path supplied.
/// </summary> /// </summary>
/// <param name="param">Expression.Parameter(typeOfClassOrInterface)</param> /// <param name="param">Expression.Parameter(typeOfClassOrInterface)</param>
/// <param name="path">the path you wish to resolve example Contact.Profile.FirstName</param> /// <param name="path">the path you wish to resolve example Contact.Profile.FirstName</param>
/// <returns></returns> /// <returns></returns>
public static Expression ResolvePathForExpression(ParameterExpression param, string path) public static Expression ResolvePathForExpression(ParameterExpression param, string path, SelectCollectionHandling selectCollectionHandling = SelectCollectionHandling.Select)
{ {
Expression body = param; var parts = path.Split('.').ToList();
foreach (var member in path.Split('.')) return InternalResolvePathExpression(param, parts, selectCollectionHandling);
{
body = Expression.PropertyOrField(body, member);
}
return body;
} }
public static ConstantExpression GetConstantSameAsLeftOperator(Expression member, object value) public static ConstantExpression GetConstantSameAsLeftOperator(Expression member, object value)