Alters email column to citext type

[rmarronnier]

Fixes #9

Inspired by : http://shuber.io/case-insensitive-unique-constraints-in-postgres/

Do not merge this as it is :

• I believe there must be a more elegant solution (Create a CIString type in Avram to automatically create a citext column type and use it in Authentic ?)
• There is no spec written to test this
• There is no error handling

Edit : https://www.postgresql.org/docs/current/citext.html

[jwoertink]

We now have support for citext https://github.com/luckyframework/avram/pull/608 This migration, however, is actually for the specs for Authentic. Generated apps would use this migration. So we'd need to update both spots as well as I'd like to see a spec on this shard to just ensure that having a citext email will actually work with different case emails.

Thanks for the suggestion on this!

[rmarronnier]

Thanks for the migration pointer ! I'll take care of this in the next days.

Right off the bat, the two specs to be added I can think of are :

• Ensure that a user can't sign up with John@example.com if an account with john@example.com already exists
• Ensure that a user can login with John@example.com to the john@example.com account

[jwoertink]

Yup! Those two specs would be great! Thanks

[rmarronnier]

While trying to write the specs, I realized :

• The existing Authentic specs don't rely on the User db table. The migration and the db are totally unused until now.
• A FakeAuthenticatable object is used in the specs, mostly for password and session utilities testing.
• The SignUp and SignIn actions and operations code are not in this repository (but in lucky-cli) We have to create a UserFactory to really test how the db handle the citext column. It's the easy part (already done but not pushed).

We have nevertheless some decisions to make :

• Should we test the SignUp and SignIn operations ? I couldn't find on the lucky website the relevant documentation to test only operations in specs. Do you have an existing example ?
• Should we test the SignUp and SignIn actions ? If so, only the API actions ? For the web actions, should we use lucky flow ?

[rmarronnier]

Also, copy-pasting code from the lucky-cli repo to test seems to me it could bite us later if we forget to update both repo. Is there any way to move all Authentic specific code from lucky-cli to the Authentic repo and make lucky-cli rely on Authentic shard for code generation ?