This may help…
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From: Deirdre Saoirse M. [email protected]
Subject: Re: [Rails] ActiveRecord without Rails
Date: Tue, 8 Nov 2005 14:24:34 -0800
On Nov 7, 2005, at 11:58 AM, CLung wrote:
Anyone know of a good site that has info/examples of using
ActiveRecord without Rails? I’ve done a few Googles but cannot
seem to get a whole lot back.
Here’s a working entire example from a post to a Ruby list.
I’ve been needing to do some ActiveRecord work outside of rails
proper lately, mostly to do things like import a bunch of existing
records from another database.
I wrote a variant of this for BayCon (who exported from Filemaker,
thus the return rather than newline between records), then wound up
needing it on another project too.
So, here’s a short example. Note that I am using my rails db
connection and I keep this script somewhere in my Rails tree (/lib
or /db, depending), so that’s why I’m not passing a YAML file for the
connection configuration.
[excluding bit about database.yml because this is a rails list]
…and here’s the db table we’re looking at inserting into:
CREATE TABLE users (
id int(11) NOT NULL auto_increment,
username varchar(50) NOT NULL,
first_name varchar(50) NOT NULL,
last_name varchar(50) NOT NULL,
password varchar(80) NOT NULL,
email varchar(75),
created_at timestamp,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
…and here’s the script as a whole.
#!/usr/bin/env ruby
require ‘rubygems’
require_gem ‘activerecord’
if I used the User class in the rails app, it’d have to follow all
the current
validations rather than the non-existent ones in actual existing
data. Thus,
create a little class without that problem.
class ImportUser < ActiveRecord::Base
set_table_name “users”
end
Read database config via YAML
@dbs = YAML::load(ERB.new(IO.read(“…/config/database.yml”)).result)
to slurp records into production db, change this line to production.
curr_db = @dbs[“development”]
these parameters are mysql-specific, figure out how to improve
ActiveRecord::Base.establish_connection(:adapter => curr_db
[“adapter”], :database => curr_db[“database”],
:host => curr_db[“host”], :username => curr_db
[“username”], :password => curr_db[“password”])
read each line from file, split into values, and insert into
database
assumption: data file is one level up from rails app
assumption 2: data is tab-delimited with a return between lines.
f = File.open(“…/…/users_export.tab”, “r”)
f.each_line(“\r”) do |line|
u = ImportUser.new
u.id, u.username, u.first_name, u.last_name, u.password, u.email =
line.chomp.split(“\t”)
u.save!
end
f.close
–
_Deirdre
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