Class: BlueprintConfig::Backend::ActiveRecord

Inherits:
Base
  • Object
show all
Defined in:
lib/blueprint_config/backend/active_record.rb

Constant Summary collapse

MISSING_TABLE_WARNING = 
<<-WARNING.gsub(/^ */, '')
  =======================================================================
  Settings table not found. Please add the configuration table by running:

  bundle exec rails generate blueprint_config:install
  bundle exec rake db:migrate
  =======================================================================
WARNING
MISSING_ATTRIBUTES_WARNING = 
<<-WARNING.gsub(/^ */, '')
  =======================================================================
  Settings table is missing required attributes: %s

  You can create a migration and adjust it to your needs by running:
  bundle exec rails generate blueprint_config:install
  =======================================================================
WARNING
REQUIRED_ATTRIBUTES = 
%w[key value type updated_at].freeze

Instance Method Summary collapse

Methods inherited from Base

#nest_hash, #source

Constructor Details

#initialize(options = {}) ⇒ ActiveRecord

Returns a new instance of ActiveRecord.



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# File 'lib/blueprint_config/backend/active_record.rb', line 30

def initialize(options = {})
  @options = options
  @updated_at = nil
  @last_checked_at = nil
  @configured = true
  @mutex = Thread::Mutex.new
end

Instance Method Details

#fresh? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/blueprint_config/backend/active_record.rb', line 102

def fresh?
  # if database is not create/configured yet - don't try to refresh settings from it
  return true unless @configured
  return true if @last_checked_at.present? && @last_checked_at > 1.second.ago

  @mutex.synchronize do
    @last_checked_at = Time.now
  end
  max_updated_at = Setting.maximum(:updated_at)

  # if there is no settings in the database - don't try to refresh settings from it'
  return true if max_updated_at.blank?

  @updated_at.present? && @updated_at >= max_updated_at
end

#has_required_attributes? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/blueprint_config/backend/active_record.rb', line 79

def has_required_attributes?
  Setting.reset_column_information
  return true if REQUIRED_ATTRIBUTES - Setting.attribute_names == []

  @configured = false

  missing = (REQUIRED_ATTRIBUTES - Setting.attribute_names).join(', ')
  unless @options[:silence_warnings]
    puts MISSING_ATTRIBUTES_WARNING % missing
    if defined?(Rails)
      Rails.logger.warn(MISSING_TABLE_WARNING)
    end
  end

  false
end

#load_keys ⇒ Object 



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# File 'lib/blueprint_config/backend/active_record.rb', line 38

def load_keys
  @configured = true

  return {} unless table_exist?
  return {} unless has_required_attributes?

  update_timestamp

  data = Setting.all.map { |s| { s.key => s.parsed_value } }.reduce(:merge) || {}
  return data.transform_keys(&:to_sym) unless @options[:nest]

  nest_hash(data, @options[:nest_separator] || '.')
rescue ::ActiveRecord::NoDatabaseError, ::ActiveRecord::ConnectionNotEstablished
  # database is not created yet
  @configured = false
  {}
rescue ::ActiveRecord::StatementInvalid => e
  @configured = false
  unless @options[:silence_warnings]
    puts "Failed to load seetings from database: #{e.message}"
    Rails.logger.warn(e.message) if defined?(Rails)
  end
  {}
end

#table_exist? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/blueprint_config/backend/active_record.rb', line 63

def table_exist?
  Setting.reset_column_information
  return true if Setting.table_exists?

  @configured = false

  unless @options[:silence_warnings]
    puts MISSING_TABLE_WARNING
    if defined?(Rails)
      Rails.logger.warn(MISSING_TABLE_WARNING)
    end
  end

  false
end

#update_timestamp ⇒ Object 



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# File 'lib/blueprint_config/backend/active_record.rb', line 96

def update_timestamp
  @mutex.synchronize do
    @updated_at = Setting.maximum(:updated_at)
  end
end