Add 'truncate' option to sequelize.sync.

[dkushner]

Fixes #2670.

[mickhansen]

@dkushner how is this exactly related to sync? Wouldn't this simply be a standalone truncate method?

[mickhansen]

(and i actually believe we have truncate support via truncate: true for deletes)

[mickhansen]

@janmeier will this doc syntax work?

[janmeier]

Nope

[dkushner]

@janmeier Adding some more commits to move the functionality out of sync(). What about the syntax breaks the docs? I'll make sure not to do it again.

[dkushner]

@mickhansen, it definitely can be a stand-alone truncate method. Would that be preferable? I was trying to avoid disrupting the existing API as much as possible. I also have a number of conceptual objections to the use of sync({ force: true }) given that Sequelize models do not represent an authoritative source for a database schema (and should not).

[mickhansen]

@dkushner well in my opinion it doesn't just make a lot of sense in sync since that carries a different meaning.

I neither fully disagree or agree with your objections to sync({force: true}), it's great for its few usecases - but no, it's obviously not the solution you want after you go out of the experimental phase.

[dkushner]

@mickhansen, I just saw your comment regarding the Model.delete({ truncate: true }) implementation. Since sequelize.sync() essentially just goes through the list of DAOs and calls sync() on each one, would this be an appropriate behaviour for sequelize.truncate()?

For example, it would just be something like:

return Promise.reduce(this.modelManager.daos, function(ag, dao) {
    return dao.delete({}, { truncate: true });
}, null);

Perhaps this is contrived, but a way to simply clear all rows of the database without affecting the schema seems useful to me. Thoughts?

[mickhansen]

@dkushner Utility methods are fine to have. sequelize.truncate() would be fine :)
Your proposed solution for implementing a top level truncate method could work, although i'd probably just use Promise.map.

[mickhansen]

Needs a rebase @dkushner, didn't see that you moved it to it's own method.

[dkushner]

@mickhansen, gotcha. My bad on that.

[mickhansen]

Ping @dkushner

[janmeier]

No response, closing