Class: MetaModel::Command::Build::Translator

Inherits:
Object
  • Object
show all
Defined in:
lib/metamodel/command/build/translator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(models, associations) ⇒ Translator

Returns a new instance of Translator.



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# File 'lib/metamodel/command/build/translator.rb', line 12

def initialize(models, associations)
  @models = models
  @associations = associations
end

Instance Attribute Details

#associations ⇒ Object (readonly)

Returns the value of attribute associations.



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# File 'lib/metamodel/command/build/translator.rb', line 10

def associations
  @associations
end

#models ⇒ Object (readonly)

Returns the value of attribute models.



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# File 'lib/metamodel/command/build/translator.rb', line 9

def models
  @models
end

Instance Method Details

#translate ⇒ Object

Raises:



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# File 'lib/metamodel/command/build/translator.rb', line 17

def translate
  name_model_hash = Hash[@models.collect { |model| [model.name, model] }]
  @associations.map! do |association|
    major_model = name_model_hash[association.major_model]
    major_model.associations << association
    association.major_model = major_model
    association.secondary_model = name_model_hash[association.secondary_model]
    size = association.through ? 3 : 2
    association.through = name_model_hash[association.through]
    raise Informative, "Associations not satisfied in `Metafile`" \
      unless [association.major_model, association.secondary_model, association.through].compact.size == size
    association
  end

  satisfy_constraint = @associations.reduce([]) do |remain, association|
    expect = remain.select { |assoc| assoc.expect_constraint? association }
    if expect.empty?
      remain << association
    else
      remain.delete expect.first
    end
    remain
  end
  raise Informative, "Unsatisfied constraints in #{satisfy_constraint.map \
    { |x| x.debug_description }}" \
    if satisfy_constraint.size > 0

  @associations.each do |association|
    major_model = association.major_model
    secondary_model = association.secondary_model
    case association.relation
    when :has_one, :has_many then
      name = association.through ? association.through.foreign_id : major_model.foreign_id
      property = Record::Property.new(name, :int, :foreign, :default => 0)
      secondary_model.properties << property
    when :belongs_to then
      name = association.through ? association.through.foreign_id : secondary_model.foreign_id
      property = Record::Property.new(name, :int, :foreign, :default => 0)
      major_model.properties << property
    end
  end

  @models.each do |model|
    model.properties.uniq! { |prop| [prop.name] }
  end
end