private static IEnumerable <object> ColumnReferences(UnpredictableColumnSource.UnpredictableColumn column, List <SnapshotTableDifferences> tableDiffs)
{
foreach (var refCol in column.ReferencingColumns)
{
var tableForValues = tableDiffs.SingleOrDefault(d => d.TableDefinition.TableName == refCol.SourceTable.TableName);
if (tableForValues != null)
{
foreach (var value in ColumnValues(column.Column.Name, tableForValues))
{
yield return(value);
}
}
}
}
private static ColumnValueSet ColumnValues(UnpredictableColumnSource table, List <SnapshotTableDifferences> tableDiffs, UnpredictableColumnSource.UnpredictableColumn column)
{
var tableForValues = tableDiffs.SingleOrDefault(d => d.TableDefinition.TableName == table.Table.TableName);
List <object> values = null;
if (tableForValues != null)
{
values = ColumnValues(column.Column.Name, tableForValues).ToList();
}
var references = ColumnReferences(column, tableDiffs).Distinct().ToList();
return(new ColumnValueSet(table.Table, column.Column, values ?? new List <object>(), references ?? new List <object>()));
}