public static bool IndexHasChanged(SchemaChanges changes, SubObjectState <UniqueIndexType, UniqueIndexType.State> current)
{
if (current == null)
{
return(true);
}
var desired = changes.Desired.Get(current);
// The index doesn't exist in the desired schema at all
if (desired == null)
{
return(true);
}
// It's changed from primary key to not or vice versa
if (desired.State.IsPrimaryKey != current.State.IsPrimaryKey)
{
return(true);
}
// The index fields are different
if (IndexState.IndexStateHasChanged(changes, current.ParentIdentifier, current.State.IndexState, desired.State.IndexState))
{
return(true);
}
return(false);
}
internal static bool IndexStateHasChanged(SchemaChanges changes, Identifier table, IndexState current, IndexState desired)
{
// The table might need to be dropped entirely to reorder the columns
if (FieldType.IsFieldReorderPossiblyNeeded(changes, table))
{
return(true);
}
// The sequence of field names don't match
if (!Enumerable.SequenceEqual(desired.FieldNames, current.FieldNames, changes.DbDriver.DbStringComparer))
{
return(true);
}
// Something custom about the index has changed
if (!changes.SchemaDriver.IsIndexCustomStateEqual(current.CustomState, desired.CustomState))
{
return(true);
}
// Any of the fields in the index are changing
if (current.Fields.Any(field => FieldType.FieldHasChanged(changes, table, field)))
{
return(true);
}
return(false);
}
public State(bool isPrimaryKey, IEnumerable <Identifier> fields, IndexCustomState customState)
{
this.isPrimaryKey = isPrimaryKey;
this.indexState = new IndexState(fields, customState);
}