protected virtual IEnumerable <MigrationOperation> Remove(IForeignKey source, ModelDifferContext diffContext)
{
var sourceExtensions = MetadataExtensions.Extensions(source);
var declaringRootEntityType = source.DeclaringEntityType.RootType();
var sourceEntityTypeExtensions = MetadataExtensions.Extensions(declaringRootEntityType);
var dropTableOperation = diffContext.FindDrop(declaringRootEntityType);
if (dropTableOperation == null)
{
yield return(new DropForeignKeyOperation
{
Schema = sourceEntityTypeExtensions.Schema,
Table = sourceEntityTypeExtensions.Table,
Name = sourceExtensions.Name
});
}
}
protected virtual IReadOnlyList <MigrationOperation> Sort(
[NotNull] IEnumerable <MigrationOperation> operations,
[NotNull] ModelDifferContext diffContext)
{
Check.NotNull(operations, nameof(operations));
var dropForeignKeyOperations = new List <MigrationOperation>();
var dropOperations = new List <MigrationOperation>();
var dropColumnOperations = new List <MigrationOperation>();
var dropTableOperations = new List <DropTableOperation>();
var createSchemaOperations = new List <MigrationOperation>();
var createSequenceOperations = new List <MigrationOperation>();
var createTableOperations = new List <CreateTableOperation>();
var alterOperations = new List <MigrationOperation>();
var renameOperations = new List <MigrationOperation>();
var renameIndexOperations = new List <MigrationOperation>();
var renameTableOperations = new List <MigrationOperation>();
var leftovers = new List <MigrationOperation>();
foreach (var operation in operations)
{
var type = operation.GetType();
if (type == typeof(DropForeignKeyOperation))
{
dropForeignKeyOperations.Add(operation);
}
else if (_dropOperationTypes.Contains(type))
{
dropOperations.Add(operation);
}
else if (type == typeof(DropColumnOperation))
{
dropColumnOperations.Add(operation);
}
else if (type == typeof(DropTableOperation))
{
dropTableOperations.Add((DropTableOperation)operation);
}
else if (type == typeof(CreateSchemaOperation))
{
createSchemaOperations.Add(operation);
}
else if (type == typeof(CreateSequenceOperation))
{
createSequenceOperations.Add(operation);
}
else if (type == typeof(CreateTableOperation))
{
createTableOperations.Add((CreateTableOperation)operation);
}
else if (_alterOperationTypes.Contains(type))
{
alterOperations.Add(operation);
}
else if (_renameOperationTypes.Contains(type))
{
renameOperations.Add(operation);
}
else if (type == typeof(RenameIndexOperation))
{
renameIndexOperations.Add(operation);
}
else if (type == typeof(RenameTableOperation))
{
renameTableOperations.Add(operation);
}
else
{
Debug.Assert(false, "Unexpected operation type: " + operation.GetType());
leftovers.Add(operation);
}
}
var createTableGraph = new Multigraph <CreateTableOperation, AddForeignKeyOperation>();
createTableGraph.AddVertices(createTableOperations);
foreach (var createTableOperation in createTableOperations)
{
foreach (var addForeignKeyOperation in createTableOperation.ForeignKeys)
{
if (addForeignKeyOperation.Table == addForeignKeyOperation.ReferencedTable &&
addForeignKeyOperation.Schema == addForeignKeyOperation.ReferencedSchema)
{
continue;
}
var principalCreateTableOperation = createTableOperations.FirstOrDefault(
o => o.Name == addForeignKeyOperation.ReferencedTable &&
o.Schema == addForeignKeyOperation.ReferencedSchema);
if (principalCreateTableOperation != null)
{
createTableGraph.AddEdge(principalCreateTableOperation, createTableOperation, addForeignKeyOperation);
}
}
}
createTableOperations = createTableGraph.TopologicalSort(
(principalCreateTableOperation, createTableOperation, addForeignKeyOperations) =>
{
foreach (var addForeignKeyOperation in addForeignKeyOperations)
{
createTableOperation.ForeignKeys.Remove(addForeignKeyOperation);
alterOperations.Add(addForeignKeyOperation);
}
return(true);
}).ToList();
var dropTableGraph = new Multigraph <DropTableOperation, IForeignKey>();
dropTableGraph.AddVertices(dropTableOperations);
foreach (var dropTableOperation in dropTableOperations)
{
var entityType = diffContext.GetMetadata(dropTableOperation);
foreach (var foreignKey in entityType.GetForeignKeysInHierarchy())
{
var principalRootEntityType = foreignKey.PrincipalEntityType.RootType();
if (entityType == principalRootEntityType)
{
continue;
}
var principalDropTableOperation = diffContext.FindDrop(principalRootEntityType);
if (principalDropTableOperation != null)
{
dropTableGraph.AddEdge(dropTableOperation, principalDropTableOperation, foreignKey);
}
}
}
var newDiffContext = new ModelDifferContext();
dropTableOperations = dropTableGraph.TopologicalSort(
(dropTableOperation, principalDropTableOperation, foreignKeys) =>
{
dropForeignKeyOperations.AddRange(foreignKeys.SelectMany(c => Remove(c, newDiffContext)));
return(true);
}).ToList();
return(dropForeignKeyOperations
.Concat(dropOperations)
.Concat(dropColumnOperations)
.Concat(dropTableOperations)
.Concat(createSchemaOperations)
.Concat(createSequenceOperations)
.Concat(createTableOperations)
.Concat(alterOperations)
.Concat(renameOperations)
.Concat(renameIndexOperations)
.Concat(renameTableOperations)
.Concat(leftovers)
.ToArray());
}