Fix duplicate JOIN statements when expanding an IQueryable that already has a join #1040
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ElizabethOkerio
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Sep 5, 2023
src/Microsoft.AspNetCore.OData/Query/Expressions/SelectExpandBinder.cs
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| } | ||
| else if (isSourceNullable) | ||
| { | ||
| object defaultValue = prop.PropertyType.IsValueType ? Activator.CreateInstance(prop.PropertyType) : null; |
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what about if the property type doesn't have the default constructor?
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All value types have a default constructor. So I don't think there will ever be a case where the property type does not have a default constructor. https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/language-specification/types#833-default-constructors
src/Microsoft.AspNetCore.OData/Query/Expressions/SelectExpandBinder.cs
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test/Microsoft.AspNetCore.OData.Tests/Query/Expressions/SelectExpandBinderTest.cs
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| foreach (var sp in structuralProperties) | ||
| { | ||
| if (prop.CanWrite && model.GetClrPropertyName(sp) == prop.Name) | ||
| { | ||
| MemberExpression propertyExpression = Expression.Property(source, prop); | ||
| bindings.Add(Expression.Bind(prop, propertyExpression)); | ||
| Expression propertyValue = Expression.Property(source, prop); |
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can we create a test case to test a big schema, for example, more than 1k properties for an entity type?
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Is it possible to have an entity type with more than 1k properties?
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wachugamaina
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Mar 8, 2024
| Orders = new List<QueryOrder>() | ||
| }; | ||
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| QueryOrder order1 = new QueryOrder { Id = 42, Title = "The order", Customer = customer1 }; |
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Let us stick to var for consistency.
wachugamaina
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Mar 8, 2024
| @@ -82,7 +84,19 @@ public SelectExpandBinderTest() | |||
| QueryOrder order = new QueryOrder { Id = 42, Title = "The order", Customer = customer }; | |||
| customer.Orders.Add(order); | |||
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| QueryCustomer customer1 = new QueryCustomer | |||
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Let us stick to var for consistency.
wachugamaina
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Mar 8, 2024
| // as observed here: https://github.com/OData/AspNetCoreOData/issues/497 | ||
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| Expression updatedExpression = null; | ||
| if (IsEfQueryProvider(context)) |
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var updatedExpression = source;
if (IsEfQueryProvider(context))
{
updatedExpression = RemoveNonStructuralProperties(context, source, structuredType);
}
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Fixes #1035
In this fix #993 we added a fix to remove duplicate joins from the generated sql. This involved making updates to the Instance property of the expression to be created and only including structural properties.
The changes led to this being generated:
Instead of this:
These changes did not take into consideration query settings. I've added checks for nullability and handling null propagation and creating a conditional expression.