protected internal IEnumerable <object> GetRelationObjects(QuerySpec filter, TableSchema.Relation parentRelation, object parentObject)
{
var relations = Schema.BuildPreloadRelationSet();
var objects = from o in DataProvider.GetObjects(filter.Native, Schema)
select Ir.WithLoadedRelations(Schema.UpdateObject(Activator.CreateInstance(Schema.ObjectType), o), relations);
if (parentRelation?.ReverseRelation != null)
{
objects = from o in objects select parentRelation.ReverseRelation.SetField(o, parentObject);
}
if (filter.Code != null)
{
objects = from o in objects where filter.Code.IsFilterMatch(o) select o;
}
objects = objects.Select(o =>
{
Fire_ObjectRead(o);
return(o);
});
return(objects);
}
public virtual TableSchema.Field GetRelationField(TableSchema.Relation relation)
{
//if (relation.LocalSchema.PrimaryKeys.Length < 1 || relation.ForeignSchema.PrimaryKeys.Length < 1)
// return null;
string relationKeyName = (relation.IsToOne ? ManyToOneLocalKeyName : OneToManyForeignKeyName)
.Replace(RELATION_CLASS_PRIMARYKEY, relation.ForeignSchema.PrimaryKeys.Length > 0 ? relation.ForeignSchema.PrimaryKeys[0].FieldName : "?")
.Replace(RELATION_CLASS_NAME, relation.ForeignSchema.ObjectType.Name)
.Replace(CLASS_PRIMARYKEY, relation.LocalSchema.PrimaryKeys.Length > 0 ? relation.LocalSchema.PrimaryKeys[0].FieldName : "?")
.Replace(CLASS_NAME, relation.LocalSchema.ObjectType.Name);
return(relation.IsToOne ? relation.LocalSchema.FieldsByFieldName[relationKeyName] : relation.ForeignSchema.FieldsByFieldName[relationKeyName]);
}
private static LambdaExpression CreateToManyFilterExpression(TableSchema.Relation relation, Expression localExpression, LambdaExpression filterLambda, ParameterExpression lambdaParameter)
{
Expression exp1 = Expression.MakeMemberAccess(localExpression, relation.LocalField.FieldInfo);
Expression exp2 = Expression.MakeMemberAccess(lambdaParameter, relation.ForeignField.FieldInfo);
if (exp2.Type != exp1.Type)
{
exp2 = Expression.Convert(exp2, exp1.Type);
}
var expression = Expression.Equal(exp1, exp2);
if (filterLambda != null)
{
expression = Expression.AndAlso(filterLambda.Body, expression);
}
return(Expression.Lambda(expression, lambdaParameter));
}
