Class: Omniconf::Adapter::ActiveRecord

Inherits:
Base
  • Object
show all
Defined in:
lib/omniconf/adapters/active_record.rb

Instance Attribute Summary

Attributes inherited from Base

#configuration, #source_id

Instance Method Summary collapse

Methods inherited from Base

#reload_configuration!

Constructor Details

#initialize(id, params) ⇒ ActiveRecord

Returns a new instance of ActiveRecord.



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# File 'lib/omniconf/adapters/active_record.rb', line 6

def initialize id, params
  @source_id = id
  defaults = {
    :model => 'ConfigValue'
  }
  defaults.merge!({
    :environment => Rails.env,
    :config_file => File.join(Rails.root, 'config/database.yml')
  }) if defined? Rails
  @params = defaults.merge params
end

Instance Method Details

#load_configuration! ⇒ Object 



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# File 'lib/omniconf/adapters/active_record.rb', line 18

def load_configuration!
  setup

  # create an empty config in case ActiveRecord raises
  @configuration = Configuration.new self

  begin
    records = @model.all
  rescue ::ActiveRecord::StatementInvalid => e
    Omniconf.logger.warn "Could not load #{@params[:model]} model, ignoring this configuration source."
    return
  end

  # build the configuration hash from DB (nesting on dots)
  hash = {}
  records.map do |record|
    key, value = record.key.split('.'), record.value
    el = key[0..-2].inject(hash) {|r,e| r[e] ||= {} }
    raise unless el[key.last].nil?
    el[key.last] = value
  end
  @configuration = Configuration.new self, hash

  Omniconf.merge_configuration! @source_id
end

#set_value(key, value) ⇒ Object 



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# File 'lib/omniconf/adapters/active_record.rb', line 44

def set_value(key, value)
  key = key.join('.')
  if item = @model.find_by_key(key)
    item.value = value
  else
    item = @model.new(:key => key, :value => value)
  end
  item.save!
  item.value
end

#setup ⇒ Object 



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# File 'lib/omniconf/adapters/active_record.rb', line 55

def setup
  # define the ActiveRecord model if missing
  unless Object.const_defined? @params[:model]
    unless ::ActiveRecord::Base.connected?
      ::ActiveRecord::Base.configurations = YAML::load(IO.read(@params[:config_file]))
      ::ActiveRecord::Base.establish_connection(@params[:environment])
    end

    klass = Class.new ::ActiveRecord::Base do
      validates_uniqueness_of :key
      serialize :value
    end

    Object.const_set @params[:model], klass
  end

  @model ||= @params[:model].constantize
end