entity framework - EF Migration Clear Cache -

public class {     public int id { get; set; }      public virtual icollection<ahistory> ahistorys { get; set; } }  public class ahistory {     public int aid { get; set; }      public virtual a {get; set; } } 

i renammed ahistories ahistory.

add-migration histomig 

ahistories: entitytype: entityset 'ahistories' based on type 'ahistory' has no keys defined.

so error mention old name no longer exists in solution.

what should ?

i've clean visual studio solution no effects.

i tried comment out navigation property, add migration, rollback migration, uncomment add migration ; still erros.

i've done search through vs solution on string "ahistories" 0 occurence found.

based on esg comment, i've added :

public class defaultcontext : dbcontext {     protected override void onmodelcreating(dbmodelbuilder modelbuilder)     {         modelbuilder.configurations.add(new ahistorymapping());          public dbset<ahistory> ahistorys { get; set; }     } }  public class ahistorymapping : entitytypeconfiguration<ahistory> {     public ahistorymapping()     {         haskey(ah => ah.aid);     } } 

it works !

edit

actually doesn't "work"... compiles result not expecting.

this code creates table unique identifier named fundid , foreign key named fund_id.

i've change code

public class ahistorymapping : entitytypeconfiguration<ahistory> {     public ahistorymapping()     {         hasrequired(ah => ah.a)         .withmany(a => a.ahistorys)         .hasforeignkey(ah => ah.aid);     } } 

it doesn't compile anymore. message again.

ahistory: : entitytype 'ahistory' has no key defined. define key entitytype. ahistorys: entitytype: entityset 'ahistorys' based on type 'ahistory' has no keys defined.

edit 2

it turns out ef require primary key. here solution :

public class ahistorymapping : entitytypeconfiguration<ahistory> {     public ahistorymapping()     {         haskey(ah => new { ah.aid, ah.date });         hasrequired(ah => ah.a)         .withmany(a => a.ahistorys)         .hasforeignkey(ah => ah.aid);     } }