Comments on: Ruby on Rails Migrations

By: Aryk Grosz

Aryk Grosz — Wed, 13 Jun 2007 06:03:15 +0000

You said that the migration does the same thing as the sql statements. When I use “:float” it doesn’t truncate the decimals to two places like you wanted to in your first example. How do you get migrations to do that?

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By: peter

peter — Fri, 23 Jun 2006 10:51:14 +0000

Well, as for the types, the possible values are:

Fixnum -> int, integer Float -> decimal, numeric, float, double Date -> interval, date String -> blob, clob, text, char, varchar, string Time -> datetime, time

(On the left side is the Ruby object, on the right the equivalent SQL)

AFAIK, tha available options are: (cut'n' paste from the API)

* :limit: Requests a maximum column length 
   (:string, :text, :binary or :integer columns only)
* :default: The column’s default value.
   You cannot explicitely set the default value to NULL. 
   Simply leave off this option if you want a NULL default value.
* :null: Allows or disallows NULL values in the column. 
   This option could have been named :null_allowed.

Hope this helps.

By: Mike

Mike — Fri, 23 Jun 2006 04:32:33 +0000

Quick question from a newbie - where can I find a list of the the values/ datatypes for all my options when creating tables (i.e. :string, :limit, :datetime). I am sure it is in the api, but just can’t think of the right terminology to look it up under. I actually have the first version of Agile Web

Any help would be greatly appreciated - thanks!

Mike

By: Jeff Rasmussen’s Healthcare IT Blog » RoR Migration Tool

Jeff Rasmussen’s Healthcare IT Blog » RoR Migration Tool — Wed, 07 Jun 2006 07:28:02 +0000

[...] Ruby on Rails Migrations Although migrations are a very cool feature of Ruby on Rails, they are not covered in any of the basic books on RoR i have encountered so far (Agile Web Development with Rails, Ruby for Rails Programmers). [...]

By: Ruby, Rails, Web2.0 » Blog Archive » Ruby on Rails Migrations Reloaded

Ruby, Rails, Web2.0 » Blog Archive » Ruby on Rails Migrations Reloaded — Sun, 21 May 2006 21:56:34 +0000

[...] Ruby on Rails Migrations Reloaded [...]

By: peter

peter — Thu, 04 May 2006 06:02:03 +0000

Thanks for the comment, cremes!
I am in the process of learning migrations (and Rails) so i am happy to hear any comments/corrections.

This blog reflects my observations during learning rails, so it is definitely not an attempt for a ‘The guru has spoken’ style stuff, but rather an ‘Everything is new to a newborn baby’ style collection of experiences

I have just bought AWDwR - which uses migrations from the beginning - and also waiting for Rails Recipes paperback, so hopefully i will improve my (migrations) skills significantly in the future…