Class: Disposable::Twin::Collection

Inherits:
Array
  • Object
show all
Includes:
Changed
Defined in:
lib/disposable/twin/collection.rb

Overview

Provides collection semantics like add, delete, and more for twin collections. Tracks additions and deletions in #added and #deleted.

Defined Under Namespace

Modules: Changed, Semantics

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Changed

#changed?

Constructor Details

#initialize(twinner, items) ⇒ Collection

Returns a new instance of Collection.



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# File 'lib/disposable/twin/collection.rb', line 10

def initialize(twinner, items)
  super(items)
  @twinner  = twinner # DISCUSS: twin items here?
  @original = items
end

Instance Attribute Details

#original ⇒ Object (readonly)

TODO: test me and rethink me.



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# File 'lib/disposable/twin/collection.rb', line 15

def original
  @original
end

Class Method Details

.for_models(twinner, models) ⇒ Object 



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# File 'lib/disposable/twin/collection.rb', line 6

def self.for_models(twinner, models)
  new(twinner, models.collect { |model| twinner.(model) })
end

Instance Method Details

#<<(model) ⇒ Object

Note that this expects a model, untwinned.



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# File 'lib/disposable/twin/collection.rb', line 18

def <<(model)
  super(twin = @twinner.(model))
  added << twin
  # this will return the model, anyway.
end

#added ⇒ Object

DISCUSS: am i a public concept, hard-wired into Collection?



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# File 'lib/disposable/twin/collection.rb', line 57

def added
  @added ||= []
end

#delete(twin) ⇒ Object

Remove an item from a collection. This will not destroy the model.



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# File 'lib/disposable/twin/collection.rb', line 32

def delete(twin)
  super(twin).tap do |res|
    deleted << twin if res
  end
end

#deleted ⇒ Object

DISCUSS: am i a public concept, hard-wired into Collection?



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# File 'lib/disposable/twin/collection.rb', line 62

def deleted
  @deleted ||= []
end

#destroy(twin) ⇒ Object

Deletes twin from collection and destroys it in #save.



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# File 'lib/disposable/twin/collection.rb', line 39

def destroy(twin)
  delete(twin)
  to_destroy << twin
end

#destroyed ⇒ Object

DISCUSS: am i a public concept, hard-wired into Collection?



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# File 'lib/disposable/twin/collection.rb', line 67

def destroyed
  @destroyed ||= []
end

#insert(index, model) ⇒ Object

Note that this expects a model, untwinned.



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# File 'lib/disposable/twin/collection.rb', line 25

def insert(index, model)
  super(index, twin = @twinner.(model))
  added << twin
  twin
end

#save ⇒ Object

only gets called when Collection::Semantics mixed in.



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# File 'lib/disposable/twin/collection.rb', line 44

def save # only gets called when Collection::Semantics mixed in.
  destroy!
end