Archive for the ‘Rails’ Category

Database Use with Rails

February 28th, 2010 | Author: David L. Whitehurst

I really like Ruby on Rails for personal application development. If I had more time, I would probably invest more of this time learning Rails to actually help small businesses develop applications. Anyhow, I have created an accounting program called “Books” that is really easy to use and I wanted to describe here how the database is used and created.

When you create your Rails application a ton of code is written for you. The key database file is called database.yml and it’s found in the project tree at /config/database.yml. Here’s my file. 

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# Licensed by Cape Henry Technologies Inc. 
# Cape Henry Technologies Inc. licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.    
 
# SQLite version 3.x
#   gem install sqlite3-ruby (not necessary on OS X Leopard)
 
 development:
  adapter: mysql
  encoding: utf8 
  database: books_development 
  pool: 5 
  username: root 
  password: 
  socket: /tmp/mysql.sock
 
#  adapter: sqlite3
#  database: db/numbers_development
#  pool: 5
#  timeout: 5000
 
# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
 
 test:
     adapter: mysql
     encoding: utf8 
     database: books_development 
     pool: 5 
     username: root 
     password: 
     socket: /tmp/mysql.sock
 
 production:
     adapter: mysql
     encoding: utf8 
     database: books_development 
     pool: 5 
     username: root 
     password: 
     socket: /tmp/mysql.sock

Notice the database name is “books_development” for all database schemas. I commit the project files to Github and tag versions. I then download a zip of the version I want and explode it into a directory called “books-2010″ and I then change the database.yml file database names to “books-2010″. This way when I run the application and actually use it, the production data is safely handled by this application source code I downloaded.

When I make the application public, one would download the version, and issue the following commands in the project root directory. 

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rake db:create <enter>
rake db:migrate <enter>
rake db:seed <enter>

The seed functionality is very cool in it’s own right. You can make up a file to preload reference data or in my case, initial accounts for your chart of accounts. Here’s a copy of seeds.rb and it’s found at /db/seeds.rb. 

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# This file should contain all the record creation needed to seed the database with its default values.
# The data can then be loaded with the rake db:seed (or created alongside the db with db:setup).
#
# Examples:
#   
#   cities = City.create([{ :name => 'Chicago' }, { :name => 'Copenhagen' }])
#   Major.create(:name => 'Daley', :city => cities.first)
 
 
general_ledger = GeneralLedger.create([
{
  :company_name => 'Acme Mousetraps Inc.',
  :address1 => '123 Pleasantville Road',
  :address2 => '',
  :city => 'Omaha',
  :state => 'Nebraska',
  :zip => '76499',
  :registered_agent => 'John Doe',
  :tax_id => '1234567890'
}
])
 
accounts = Account.create([
    {
      :acct_no => '100',
      :acct_name => 'Cash',
      :acct_type => 'A',
      :balance => '1000.00',
      :general_ledger_id => '1'
    },
    {
      :acct_no => '102',
      :acct_name => 'Accounts Receivable',
      :acct_type => 'A',
      :balance => '0.00',
      :general_ledger_id => '1'
 
    },
    {
      :acct_no => '109',
      :acct_name => 'Capital',
      :acct_type => 'A',
      :balance => '0.00',
      :general_ledger_id => '1'
 
    },
    {
      :acct_no => '103',
      :acct_name => 'Supplies',
      :acct_type => 'A',
      :balance => '0.00',
      :general_ledger_id => '1'
 
    },
    {
      :acct_no => '104',
      :acct_name => 'Equipment',
      :acct_type => 'A',
      :balance => '0.00',
      :general_ledger_id => '1'
 
    },
    {
      :acct_no => '202',
      :acct_name => 'Accounts Payable',
      :acct_type => 'L',
      :balance => '0.00',
      :general_ledger_id => '1'
 
    },
    {
      :acct_no => '202',
      :acct_name => 'Tax Payable',
      :acct_type => 'L',
      :balance => '0.00',
      :general_ledger_id => '1'
 
    },
    {
      :acct_no => '300',
      :acct_name => 'Drawing',
      :acct_type => 'L',
      :balance => '0.00',
      :general_ledger_id => '1'
 
    },
    {
      :acct_no => '500',
      :acct_name => 'Rent Expense',
      :acct_type => 'E',
      :balance => '0.00',
      :general_ledger_id => '1'
 
    },
    {
      :acct_no => '501',
      :acct_name => 'Supplies Expense',
      :acct_type => 'E',
      :balance => '0.00',
      :general_ledger_id => '1'
 
    },
    {
      :acct_no => '502',
      :acct_name => 'Books Expense',
      :acct_type => 'E',
      :balance => '0.00',
      :general_ledger_id => '1'
 
    },
    {
      :acct_no => '503',
      :acct_name => 'Meals Expense',
      :acct_type => 'E',
      :balance => '0.00',
      :general_ledger_id => '1'
 
    },
    {
      :acct_no => '504',
      :acct_name => 'Auto Expense',
      :acct_type => 'E',
      :balance => '0.00',
      :general_ledger_id => '1'
 
    },
    {
      :acct_no => '505',
      :acct_name => 'Misc Expense',
      :acct_type => 'E',
      :balance => '0.00',
      :general_ledger_id => '1'
 
    },
    {
      :acct_no => '506',
      :acct_name => 'Electric Expense',
      :acct_type => 'E',
      :balance => '0.00',
      :general_ledger_id => '1'
 
    },
    {
      :acct_no => '507',
      :acct_name => 'Internet Expense',
      :acct_type => 'E',
      :balance => '0.00',
      :general_ledger_id => '1'
 
    },
    {
      :acct_no => '508',
      :acct_name => 'Liability Insurance Expense',
      :acct_type => 'E',
      :balance => '0.00',
      :general_ledger_id => '1'
 
    },
    {
      :acct_no => '509',
      :acct_name => 'Medical Insurance Expense',
      :acct_type => 'E',
      :balance => '0.00',
      :general_ledger_id => '1'
 
    }
 
])

The third rake command you issue, finds this files and pre-loads your database with this data.

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