Forum: Ruby on Rails Problem with db_schema_import and MySQL timestamp!

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MiKael N. (Guest)
on 2006-02-23 16:31
(Received via mailing list)
This post concerns a SQL error while I try to import a schema into MySQL
with timestamp dates.

To reproduce try these commands:

mickey@bunny:~/dev/rails/timeonrails$ rake db_schema_dump
(in /home/mickey/dev/rails/timeonrails)

mickey@bunny:~/dev/rails/timeonrails$ cat db/schema.rb
# This file is autogenerated. Instead of editing this file, please use
# migrations feature of ActiveRecord to incrementally modify your
database, and
# then regenerate this schema definition.

ActiveRecord::Schema.define() do

  create_table "categories", :force => true do |t|
    t.column "name", :string, :limit => 20
    t.column "description", :text
    t.column "created_on", :timestamp, :limit => 14
    t.column "updated_on", :timestamp, :limit => 14


Then, when I try to re-import the same schema, I get a SQL error:

mickey@bunny:~/dev/rails/timeonrails$ rake db_schema_import
(in /home/mickey/dev/rails/timeonrails)
rake aborted!
Mysql::Error: You have an error in your SQL syntax.  Check the manual
corresponds to your MySQL server version for the right syntax to use
near '(14),
`updated_on` datetime(14)) ENGINE=InnoDB' at line 1: CREATE TABLE
(`id` int(11) DEFAULT NULL auto_increment PRIMARY KEY, `name`
`description` text, `created_on` datetime(14), `updated_on`

After executing the import with --trace option it looks like the problem
coming from mysql_adapter.rb file, where any reference to :timestamp is
replaced by :datetime, but the 'datetime' SQL command does not accept an
argument (14)!

PS: Another consequence of this error is that the table is dropped at
the same
time, that is not a good news!

I propose the following patch:

mickey@bunny:~/.../vendor/.../active_record/connection_adapters$ diff
./mysql_adapter.rb ./mysql_adapter-patched.rb

 2006-02-23 12:30:19.000000000 +0100
 2006-02-23 12:29:50.000000000 +0100
@@ -103,7 +103,7 @@
           :integer     => { :name => "int", :limit => 11 },
           :float       => { :name => "float" },
           :datetime    => { :name => "datetime" },
-          :timestamp   => { :name => "datetime" },
+          :timestamp   => { :name => "timestamp" },
           :time        => { :name => "time" },
           :date        => { :name => "date" },
           :binary      => { :name => "blob" },

I don't know if it's a good idea, I am not an expert on MySQL.
So, I'm waiting for yours advises...

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