How to create migration files?

[dachary (Loïc Dachary)]

I would like to create a new table (to store the graph for vote delegation). Should I create a migration file similar to db/migrate/20120311170118_create_users.rb manually ? Or is it enough to update the == Schema Information at the end of the model file ? I naively tried that and run rake db:migrate but it did not work

[Overgrow (OG)]

No, you need to create migrate file and run it with db:migrate (see ActiveRecord docs )

[Falco]

Note that if you are developing a plugin, discourse provides a PluginStore to help you avoid migrations, since undoing then when the plugin gets uinstalled is a open problem.

[dachary (Loïc Dachary)]

@Overgrow

No, you need to create migrate file and run it with db:migrate

Thanks, I’m glad I did not miss something

[dachary (Loïc Dachary)]

@Falco

discourse provides a PluginStore to help you avoid migrations

cool. Is there a plugin I could read to see how it’s used ? I found something on rubydoc.

[Falco]

Canned replies is recent and does it very clearly:

https://github.com/discourse/discourse-canned-replies/blob/master/plugin.rb

[Overgrow (OG)]

@Falco

Note that if you are developing a plugin, discourse provides a PluginStore to help you avoid migrations, since undoing then when the plugin gets uinstalled is a open problem.

OK, thanks… I see …