public static MigrationSet MakePlan(IDatabase database, ChangeGoal spec, params IMigrationLoader[] migrationLoaders)
{
var targetVersion = FindTrueTargetVersion(spec.TargetVersion, migrationLoaders);
User.Notify(DescribePlan(spec.CurrentVersion, targetVersion));
var plan = PlanToGetFromCurrentToTarget(spec, targetVersion);
return new MigrationSet(plan, database, migrationLoaders);
}
private static ChangePlan PlanToGetFromCurrentToTarget(ChangeGoal spec, int targetVersion)
{
if (targetVersion >= spec.CurrentVersion)
{
var firstMigrationToApply = spec.CurrentVersion + 1;
return new ChangePlan(Do.Apply,
Enumerable.Range(firstMigrationToApply, targetVersion - firstMigrationToApply + 1));
}
else
{
var firstMigrationToApply = spec.CurrentVersion;
return new ChangePlan(Do.Unapply,
Enumerable.Range(targetVersion + 1, firstMigrationToApply - targetVersion).Reverse());
}
}
public ChangePlanner(IDatabase database, ChangeGoal request)
{
this._database = database;
this._request = request;
}
