public override ISqlElement VisitIsReference(IsReferenceExpression expression)
{
var result = base.VisitIsReference(expression);
var tableMapping = mappingSource.ResolveTableOrNull(expression.ObjectName);
if (tableMapping == null)
{
const string messageFormat = "operator [Ссылка] has unknown object name [{0}]";
throw new InvalidOperationException(string.Format(messageFormat, expression.ObjectName));
}
return(result);
}
public override ISqlElement VisitIsReference(IsReferenceExpression expression)
{
var queryRoot = queryEntityRegistry.Get(expression.Argument.Table);
var propertyNames = expression.Argument.Name.Split('.');
var propertiesEnumerator = new PropertiesEnumerator(propertyNames, queryRoot, queryEntityAccessor);
var referencedProperties = propertiesEnumerator.Enumerate();
if (referencedProperties.Count != 1)
{
const string messageFormat = "operator IsReference property [{0}] has many " +
"variants which is not supported currently";
throw new InvalidOperationException(string.Format(messageFormat,
expression.Argument.Name));
}
var property = referencedProperties[0];
var entity = property.nestedEntities.SingleOrDefault(x => x.mapping.QueryTableName == expression.ObjectName);
if (entity == null)
{
const string messageFormat = "can't find entity [{0}] for property [{1}]";
throw new InvalidOperationException(string.Format(messageFormat,
expression.ObjectName, expression.Argument.Name));
}
var unionCondition = queryEntityAccessor.GetUnionCondition(property, entity);
if (unionCondition == null)
{
const string messageFormat = "property [{0}] has only one possible type";
throw new InvalidOperationException(string.Format(messageFormat,
expression.Argument.Name));
}
if (queryRoot.additionalFields == null)
{
queryRoot.additionalFields = new List <SelectFieldExpression>();
}
var filterColumnName = nameGenerator.GenerateColumnName();
queryRoot.additionalFields.Add(new SelectFieldExpression
{
Expression = unionCondition,
Alias = filterColumnName
});
var result = new ColumnReferenceExpression
{
Name = filterColumnName,
Table = expression.Argument.Table
};
rewritten.Add(result);
return(result);
}
public virtual ISqlElement VisitIsReference(IsReferenceExpression expression)
{
expression.Argument = (ColumnReferenceExpression)VisitColumnReference(expression.Argument);
return(expression);
}
public override ISqlElement VisitIsReference(IsReferenceExpression expression)
{
NotSupported(expression, expression.Argument, expression.ObjectName);
return(expression);
}