Class: Ruote::Exp::RestoreExpression

Inherits:
FlowExpression show all
Includes:
MergeMixin
Defined in:
lib/ruote/exp/fe_restore.rb

Overview

Restores the fields of the current workitem. That means usually copying them from a saved version in a variable or in a separate field.

restore :from_var => 'v'

or

restore :from_f => 'customer.address.street', :to_f => 'delivery.street'

(yes, this sets the field ‘street’ inside of the field ‘delivery’)

set_fields

This expressions has a ‘set_fields’ alias. It can be handy (and readable) to set a bunch of workitem fields in one sweep somewhere in a process :

Ruote.process_definition :name => 'working hard' do
  sequence do
    set_fields :val => { 'customer' => { 'name' => 'Fred', 'age' => 40 } }
    participant :ref => 'delivery'
    participant :ref => 'invoincing'
  end
end

Constant Summary

Constants inherited from FlowExpression

FlowExpression::COMMON_ATT_KEYS

Instance Attribute Summary

Attributes inherited from FlowExpression

#context, #error, #h

Instance Method Summary collapse

Methods included from MergeMixin

#merge_workitem, #merge_workitems

Methods inherited from FlowExpression

#ancestor?, #att, #attribute, #attribute_text, #attributes, #cancel, #compile_atts, #compile_variables, do_action, #do_apply, #do_cancel, #do_fail, #do_pause, #do_persist, #do_reply, #do_resume, #do_unpersist, #expand_atts, #fei, fetch, from_h, #handle_on_error, #has_attribute, #initial_persist, #initialize, #iterative_var_lookup, #launch_sub, #lookup_on_error, #lookup_val, #lookup_val_prefix, #lookup_variable, #name, names, #parent, #parent_id, #persist_or_raise, #reply_to_parent, #set_variable, #to_h, #tree, #tree_children, #try_persist, #try_unpersist, #unpersist_or_raise, #unset_variable, #update_tree, #variables

Methods included from WithMeta

#class_def, included

Methods included from WithH

included

Constructor Details

This class inherits a constructor from Ruote::Exp::FlowExpression

Instance Method Details

#apply ⇒ Object 



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# File 'lib/ruote/exp/fe_restore.rb', line 63

def apply

  from =
    has_attribute(*%w[ v var variable ].map { |k| "from_#{k}" }) ||
    has_attribute(*%w[ f fld field ].map { |k| "from_#{k}" }) ||
    has_attribute(*%w[ val value ])

  _, to_f = determine_tos
    # note : to_v is discarded (the underscore)

  from = 'from_var' if from == 'from_v'

  afrom = attribute(from)

  fields = if from.match(/var/)
    lookup_variable(afrom)
  elsif from.match(/f/)
    Ruote.lookup(h.applied_workitem['fields'], afrom)
  else # val
    afrom
  end

  if to_f
    Ruote.set(h.applied_workitem['fields'], to_f, fields)
  else
    h.applied_workitem['fields'] = fields
  end

  # TODO : merge strategies

  reply_to_parent(h.applied_workitem)
end

#reply(workitem) ⇒ Object 



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# File 'lib/ruote/exp/fe_restore.rb', line 96

def reply(workitem)

  # empty, never called
end