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jacob-s-son/application_setting.rb

Created May 23, 2012 16:06
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Simple active record class to store in database some application settings adjustable by users
Raw
application_setting.rb
class ApplicationSetting < ActiveRecord::Base
belongs_to :setting_type
validates_presence_of :code, :name, :value, :setting_type
validates_uniqueness_of :code
attr_accessible :code, :name, :value, :setting_type, :setting_type_id
class << self
#for usage like ApplicationSetting["some_setting_code"]
def [] key
find_by_code(key).try :value
end
end
def value
#setting type could be decimal, integer, string
case setting_type.name
when "decimal" then BigDecimal( read_attribute(:value).to_s )
when "integer" then read_attribute(:value).to_i
else read_attribute(:value)
end
end
end
Raw
application_setting_test.rb
require 'test_helper'
class ApplicationSettingTest < ActiveSupport::TestCase
test "should return value of a setting when setting's coe is passed in []" do
assert_equal ApplicationSetting["SUFFICIENT_USER_LEVEL"], 8 #this setting is seeded in our application
end
test "should return nil if no setting found" do
assert_equal ApplicationSetting["lala"], nil
end
test "should convert value string to interger, if setting_type is integer" do
as = ApplicationSetting.new(:code => "code", :name => "name", :setting_type => SettingType.find_by_name("integer"), :value => "5")
assert_equal as.value.class, Fixnum
assert_equal as.value, 5
end
test "should convert value string to BigDecimal, if setting_type is decimal" do
as = ApplicationSetting.new(:code => "code", :name => "name", :setting_type => SettingType.find_by_name("decimal"), :value => "5.78")
assert_equal as.value.class, BigDecimal
assert_equal as.value, 5.78
end
test "should return plain value if setting_type is other than decimal or integer" do
as = ApplicationSetting.new(:code => "code", :name => "name", :setting_type => SettingType.find_by_name("string"), :value => "5.78")
assert_equal as.value.class, String
assert_equal as.value, "5.78"
end
test "should return nil if value attribute is nil" do
as = ApplicationSetting.new(:code => "code", :name => "name", :setting_type => SettingType.find_by_name("string"), :value => nil)
assert_equal as.value.class, NilClass
assert_equal as.value, nil
end
end
Raw
migration_create_application_setting.rb
class CreateApplicationSettings < ActiveRecord::Migration
def change
create_table :application_settings do |t|
t.integer :setting_type_id
t.string :code
t.string :value
t.string :name
t.timestamps
end
end
end
Raw
migration_create_setting_types.rb
class CreateSettingTypes < ActiveRecord::Migration
def change
create_table :setting_types do |t|
t.string :name
t.timestamps
end
end
end
Raw
migration_indeces_for_application_settings.rb
class SettingsFkIndeces < ActiveRecord::Migration
def up
add_index :application_settings, :code, :unique => true
add_index :application_settings, :setting_type_id
end
def down
remove_index :application_settings, :column_name =>:code
remove_index :application_settings, :column_name =>:setting_type_id
end
end
Raw
setting_type.rb
class SettingType < ActiveRecord::Base
has_many :application_settings
end
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