c# - Foreign key "The property X on entity type Y could not be found" Entity Framework Core -

i've started working ef. have simple models page , related pages.

public class page {     public int id { get; set; }     [required]     public string urlname { get; set; }     [required]     public string title { get; set; }     public list<relatedpages> relpages1 { get; set; }     public list<relatedpages> relpages2 { get; set; } } public class relatedpages {     public int id { get; set; }     public int page1id { get; set; }     public page page1 { get; set; }     public int page2id { get; set; }     public page page2 { get; set; } } 

this in dbcontext:

protected override void onmodelcreating(modelbuilder modelbuilder) {     modelbuilder.entity<page>().hasindex(x => x.urlname).isunique();      modelbuilder.entity<relatedpages>().hasone(x => x.page1).withmany(x => x.relpages1).hasforeignkey(x => x.page1id);     modelbuilder.entity<relatedpages>().hasone(x => x.page2).withmany(x => x.relpages2).hasforeignkey(x => x.page2id); } 

though when try execute command

dbcontext.pages.where(x => x.relpages1 != null); 

i have exception

invalidoperationexception: property 'page1id' on entity type 'page' not found. ensure property exists , has been included in model.

this appears bug in ef core. can file issues @ https://github.com/aspnet/entityframework/issues.

if trying query set of pages have @ least 1 relpages1, linq query doesn't have same bug , returns expect result is:

dbcontext.pages.where(x => x.relpages1.count() > 0)