An error was generated for warning 'Microsoft.EntityFrameworkCore.Query.InvalidIncludePathError': Unable to find navigation specified in string based include path

Question: What does this error mean? "InvalidOperationException: An error was generated for warning 'Microsoft.EntityFrameworkCore.Query.InvalidIncludePathError': Unable to find navigation 'CartItems' specified in string based include path 'CartItems'. This exception can be suppressed or logged by passing event ID 'CoreEventId.InvalidIncludePathError' to the 'ConfigureWarnings' method in 'DbContext.OnConfiguring' or 'AddDbContext'.
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Answer: There is a possibility that you have used an Include directive wrong. See the notes below to make sure that you have provided the Navigation in the Data Model. What I mean by "Navigation" is take a look at the code below:

public class SomeMainModel {
public string id {get; set;}
public List<MySubModel> mySubModel {get; set} = new List(MySubModel);
}

public class partial MySubModel {
//Properties come here
}


This way you could now use the "Include" in your LINQ Queries like so:

var myWholeModel = _context.MyMainModel.Include(a=> a.MySubModel).ToList();

[Note]: Make sure that you step through your code and make sure that data is retrieved.

I hope this helped you, if it did please leave a comment below.


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Jki said:

You have to make sure that the MySubModal has a property name called SomeMainModelId for navigation to work.


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