public static string CreateOneToManyAssociation(this TableData table, TableData foreignTable, string columnNames, string foreignColumnNames, string constraintName)
{
// create an IEnumerable<> with the type of the (main) table's type builder
var typedEnumerableType = typeof(IEnumerable <>).MakeGenericType(table.TypeBuilder);
// use the table's name as property name
var propertyName = $"{table.ExplorerItem.Text}";
var i = 1;
while (!foreignTable.PropertyAndFieldNames.Add(propertyName))
{
propertyName = $"{table.ExplorerItem.Text}{i++}";
}
// create a property in the foreign key's target table
var property = foreignTable.TypeBuilder.DefineProperty(propertyName, typedEnumerableType);
// create a getter for the property
var propertyGetter = foreignTable.TypeBuilder.DefineGetter(property);
// obtain ResolveOneToMany method
var resolveOneToManyMethod = typeof(Entity).GetMethod("ResolveOneToMany", BindingFlags.Instance | BindingFlags.NonPublic).MakeGenericMethod(table.TypeBuilder);
// "implement" the method to obtain and return the value by calling 'ResolveOneToMany'
var ilGenerator = propertyGetter.GetILGenerator();
// call the method and return the value
ilGenerator.Emit(OpCodes.Ldarg_0);
ilGenerator.Emit(OpCodes.Ldstr, property.Name);
ilGenerator.Emit(OpCodes.Call, resolveOneToManyMethod);
ilGenerator.Emit(OpCodes.Ret);
property.SetGetMethod(propertyGetter);
// add the 'AssociationAttribute' to the property
property.AddAssociationAttribute(foreignColumnNames, columnNames, table.Name);
// create the explorer item
var explorerItem = new ExplorerItem(propertyName, ExplorerItemKind.CollectionLink, ExplorerIcon.OneToMany)
{
HyperlinkTarget = table.ExplorerItem,
ToolTipText = $"{table.ExplorerItem.Text} ({constraintName})"
};
foreignTable.ExplorerItem.Children.Add(explorerItem);
// create 'backward' association
table.CreateManyToOneAssociation(foreignTable, foreignColumnNames, columnNames, constraintName, true);
return(propertyName);
}
