Is there a way to get a collection of all the Mode

Question

Is there a way that you can get a collection of all of the Models in your Rails app?

Basically, can I do the likes of: -

Models.each do |model|
  puts model.class.name
end

Answer 1

Just in case anyone stumbles on this one, I've got another solution, not relying on dir reading or extending the Class class...

ActiveRecord::Base.send :subclasses

This will return an array of classes. So you can then do

ActiveRecord::Base.send(:subclasses).map(&:name)

Answer 2

I think @hnovick's solution is a cool one if you dont have table-less models. This solution would work in development mode as well

My approach is subtly different though -

ActiveRecord::Base.connection.tables.map{|x|x.classify.safe_constantize}.compact

classify is well supposed to give you the name of the class from a string properly. safe_constantize ensures that you can turn it into a class safely without throwing an exception. This is needed in case you have database tables which are not models. compact so that any nils in the enumeration are removed.

Answer 3

Yes there are many ways you can find all model names but what I did in my gem model_info is , it will give you all the models even included in the gems.

array=[], @model_array=[]
Rails.application.eager_load!
array=ActiveRecord::Base.descendants.collect{|x| x.to_s if x.table_exists?}.compact
array.each do |x|
  if  x.split('::').last.split('_').first != "HABTM"
    @model_array.push(x)
  end
  @model_array.delete('ActiveRecord::SchemaMigration')
end

then simply print this

@model_array

Answer 4

can check this

@models = ActiveRecord::Base.connection.tables.collect{|t| t.underscore.singularize.camelize}

Answer 5

ActiveRecord::Base.connection.tables.map do |model|
  model.capitalize.singularize.camelize
end

will return

["Article", "MenuItem", "Post", "ZebraStripePerson"]

Additional information If you want to call a method on the object name without model:string unknown method or variable errors use this

model.classify.constantize.attribute_names

Answer 6

I looked for ways to do this and ended up choosing this way:

in the controller:
    @data_tables = ActiveRecord::Base.connection.tables

in the view:
  <% @data_tables.each do |dt|  %>
  <br>
  <%= dt %>
  <% end %>
  <br>

source: http://portfo.li/rails/348561-how-can-one-list-all-database-tables-from-one-project