Class: Harmonize::Strategies::BasicCrudStrategy::Modifier

Inherits:
Object
  • Object
show all
Defined in:
lib/harmonize/strategies/basic_crud_strategy.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(source, target, strategy) ⇒ Modifier

Returns a new instance of Modifier.



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# File 'lib/harmonize/strategies/basic_crud_strategy.rb', line 51

def initialize(source, target, strategy)
  @source     = source
  @target     = target
  @error      = nil # any error that occured during modification
  @type       = nil # [ create, update, destroy ]
  @targets    = strategy.targets
  @log        = strategy.harmonize_log
  @key        = strategy.harmonizer.key
end

Class Method Details

.destroy(target, strategy) ⇒ Object 



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# File 'lib/harmonize/strategies/basic_crud_strategy.rb', line 47

def self.destroy(target, strategy)
  new(nil, target, strategy).destroy
end

.modify(source, strategy) ⇒ Object 



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# File 'lib/harmonize/strategies/basic_crud_strategy.rb', line 43

def self.modify(source, strategy)
  new(source, nil, strategy).modify
end

Instance Method Details

#create_log_entry ⇒ Object 



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# File 'lib/harmonize/strategies/basic_crud_strategy.rb', line 113

def create_log_entry
  @log.modifications.create(
    :instance_id       => @target.id,
    :modification_type => @type,
    :instance_errors   => @error,
    :before_time       => @before,
    :after_time        => @after
  )
end

#destroy ⇒ Object 



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# File 'lib/harmonize/strategies/basic_crud_strategy.rb', line 69

def destroy
  log do
    @type = 'destroy'
    @target.destroy
    @modified = true
  end
end

#find_or_initialize_target ⇒ Object 



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# File 'lib/harmonize/strategies/basic_crud_strategy.rb', line 77

def find_or_initialize_target
  target_relation = @targets.where( @key => @source[@key] )
  @target = target_relation.first || target_relation.build
  @type   = @target.new_record? ? 'create' : 'update'
end

#log ⇒ Object 



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# File 'lib/harmonize/strategies/basic_crud_strategy.rb', line 94

def log
  @before = DateTime.now
  yield
  @after  = DateTime.now
rescue *model_errors => e
  @error = e.message
ensure
  if @error
    @type  = 'error'
    @after = nil
  end
  create_log_entry if @modified || @error
end

#model_errors ⇒ Object 



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# File 'lib/harmonize/strategies/basic_crud_strategy.rb', line 108

def model_errors
  return [ ActiveRecord::UnknownAttributeError, ActiveRecord::ActiveRecordError ] if defined?(::ActiveRecord)
  return [ Mongoid::MongoidError ] if defined?(::ActiveRecord)
end

#modify ⇒ Object 



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# File 'lib/harmonize/strategies/basic_crud_strategy.rb', line 61

def modify
  log do
    find_or_initialize_target
    update_target_attributes
    save_target
  end
end

#save_target ⇒ Object 



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# File 'lib/harmonize/strategies/basic_crud_strategy.rb', line 88

def save_target
  unless @target.save
    @error = @target.errors.full_messages
  end
end

#update_target_attributes ⇒ Object 



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# File 'lib/harmonize/strategies/basic_crud_strategy.rb', line 83

def update_target_attributes
  @target.attributes = @source
  @modified = @target.changed?
end