Module: EmbeddedRecord

Defined in:
lib/embedded_record.rb

Defined Under Namespace

Modules: Record

Constant Summary collapse

VERSION = 
"0.0.5"

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(klass) ⇒ Object 



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# File 'lib/embedded_record.rb', line 4

def self.included(klass)
  klass.extend self
end

Instance Method Details

#embed_record(name, options = {}) ⇒ Object

Options:

- :class - Class to embed
- :scope - Boolean wheter to install ActiveRecord scope



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# File 'lib/embedded_record.rb', line 12

def embed_record(name, options = {})
  klass = options[:class] || EmbeddedRecord.constantize(name.to_s)
  attr = "#{name}_mask"
  all = klass.all

  define_method name do
    if val = send(attr)
      klass.all[val]
    elsif klass.null_record
      klass.null_record
    end
  end

  define_method "#{name}_id" do
    if val = send(attr)
      klass.all[val].id
    end
  end

  define_method "#{name}_id=" do |id|
    type_method = embed_id_type_method(klass)
    index = klass.all.index { |obj| obj.id == id.send(type_method) }
    send "#{attr}=", index
    index
  end

  if options[:scope] == true
    embed_record_scope name
  end
end

#embed_record_scope(name) ⇒ Object 



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# File 'lib/embedded_record.rb', line 84

def embed_record_scope(name)
  klass = EmbeddedRecord.constantize(name)

  send :scope, :"with_#{name}", lambda { |*ids|
    masks = ids.map { |id| klass.find(id).index }
    where("#{name}_mask in (?)", masks)
  }
end

#embed_records(name, options = {}) ⇒ Object

Options:

- class - Class of record
- singular - singular form of name

Example:

class Shirt
  embed_records :colors, :class => Color, :singular => :color
end



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# File 'lib/embedded_record.rb', line 54

def embed_records(name, options = {})
  singular = options[:singular] || EmbeddedRecord.singularize(name.to_s)
  klass = options[:class] || EmbeddedRecord.constantize(singular.to_s)
  all_ids = klass.all.map { |obj| obj.id }
  attr = "#{name}_mask"

  define_method "#{singular}_ids=" do |ids|
    type_method = embed_id_type_method(klass)
    ids = ids.map(&type_method)
    self.send "#{attr}=",
      (ids & all_ids).map { |r| 2**all_ids.index(r) }.inject(0, :+)
  end

  define_method "#{singular}_ids" do
    all_ids.reject { |r| ((send(attr) || 0) & 2**all_ids.index(r)).zero? }
  end

  define_method name do
    ids = send("#{singular}_ids")

    klass.all.select do |obj|
      ids.include? obj.id
    end
  end

  if options[:scope] == true
    embed_records_scope name
  end
end

#embed_records_scope(name) ⇒ Object 



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# File 'lib/embedded_record.rb', line 93

def embed_records_scope(name)
  klass = EmbeddedRecord.constantize(name)

  send :scope, :"with_#{name}", lambda { |*ids|
    masks = ids.map { |id| 2 ** klass.find(id).index }.join(" | ")
    where("#{name}_mask & (?)", masks)
  }
end