Module: DynamicModels

Included in:
ActionController::Base
Defined in:
lib/dynamic_models.rb

Instance Method Summary collapse

Instance Method Details

#base_model_class ⇒ Object 



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# File 'lib/dynamic_models.rb', line 30

def base_model_class
  base_model_class_name.camelize.constantize
end

#base_model_class_name ⇒ Object

the model class, inferred from the controller



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# File 'lib/dynamic_models.rb', line 26

def base_model_class_name
  params[:controller].split('/').last.singularize
end

#fetch_model ⇒ Object

returns a model using the id from the params



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# File 'lib/dynamic_models.rb', line 60

def fetch_model
  model_class.find params[:id]
end

#fetch_model_list ⇒ Object

returns an array of models (using the name of this controller)



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# File 'lib/dynamic_models.rb', line 65

def fetch_model_list
  if parent_model
    return parent_model.send("#{model_name.pluralize.downcase}")
  else
    return model_class.find(:all)
  end
end

#model_class ⇒ Object

the class we are working with, if an STI model then it will fail loudly on a type which inst descendant from the class which corresponds to this controller



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# File 'lib/dynamic_models.rb', line 35

def model_class
  klass = model_name.camelize.constantize
  if sti_model?
    raise "you can only pass a type which descends from #{params[:controller]}" unless klass.sti_model? and klass.parent == base_model_class
  end
  klass
end

#model_name ⇒ Object

model name from the controller or type parameter (for a model which is using STI)



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# File 'lib/dynamic_models.rb', line 21

def model_name
  sti_model? ? params[:type].underscore : base_model_class_name
end

#new_model(defaults = {}) ⇒ Object

returns a new model, it can be set with an optional hash



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# File 'lib/dynamic_models.rb', line 49

def new_model(defaults = {})
  new_model = model_class.new(defaults)
  # if there is a parent then associate it with the model
  if parent_model
    new_model.send("#{parent_model.class.name.underscore}=", parent_model)
  end
  # return the new model
  new_model
end

#parent_model ⇒ Object

looks for object_id notation, and returns a new model



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# File 'lib/dynamic_models.rb', line 6

def parent_model
  params.each do |name, value|
    if name =~ /(.+)_id$/
      return @parent_model ||= $1.camelize.constantize.find(value)
    end
  end
  nil
end

#plural_model_name ⇒ Object

plural form of the model name from the controller



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# File 'lib/dynamic_models.rb', line 44

def plural_model_name
  params[:controller].split('/').last
end

#sti_model? ⇒ Boolean

if we are using a type parameter, then we are dealing with an STI model

Returns:

  • (Boolean) 


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# File 'lib/dynamic_models.rb', line 16

def sti_model?
  params[:type].present?
end