Class: ToyModel::AttributeObserver

Inherits:
Object
  • Object
show all
Defined in:
lib/toy-model/attribute_observer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(model) ⇒ AttributeObserver

Returns a new instance of AttributeObserver.



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# File 'lib/toy-model/attribute_observer.rb', line 6

def initialize model
  return unless model.respond_to?(:use_toy_model?) && model.use_toy_model?
  @model = model
  unless ActiveRecord::Base.connection.table_exists? @model.table_name
    Class.new(ActiveRecord::Migration).create_table(@model.table_name.to_sym) do |t|
      t.timestamps
    end
  end
  @model.attributes.each do |attribute|
    set_attribute(attribute)
    @model.attr_accessible attribute.column
    @model.attr_accessible :"#{attribute.column}_id" if attribute._as == :belongs_to
  end
  @model.reset_column_information
end

Instance Attribute Details

#attribute ⇒ Object

Returns the value of attribute attribute.



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# File 'lib/toy-model/attribute_observer.rb', line 4

def attribute
  @attribute
end

Instance Method Details

#add_attribute(attribute) ⇒ Object 



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# File 'lib/toy-model/attribute_observer.rb', line 28

def add_attribute attribute
  unless @model.column_names.include? attribute.to_table_column.to_s
    Class.new(ActiveRecord::Migration).add_column @model.table_name.to_sym, attribute.to_table_column, attribute.to_table_type
  end
end

#set_attribute(attribute) ⇒ Object 



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# File 'lib/toy-model/attribute_observer.rb', line 22

def set_attribute attribute
  return if attribute.skip_table_column?
  add_attribute attribute
  update_attribute attribute
end

#update_attribute(attribute) ⇒ Object 



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# File 'lib/toy-model/attribute_observer.rb', line 34

def update_attribute attribute
  column = @model.columns.select{|c| c.name == attribute.to_table_column.to_s}.first
  if column && column.type != attribute.to_table_type
    Class.new(ActiveRecord::Migration).change_column @model.table_name, attribute.to_table_column, attribute.to_table_type
  end
end