Countless Extra

This extra uses the Pagy::Countless subclass in order to avoid to execute an otherwise needed count query. It is especially useful when used with large DB tables, where Caching the count may not be an option.

Its usage is practically the same as the regular Pagy::Backend module (see the backend doc).

The pagination resulting from this extra has some limitation as documented in the Pagy::Countless Caveats doc.

Synopsis

See extras for general usage info.

In the pagy.rb initializer:

require 'pagy/extras/countless'

In a controller:

@pagy, @records  = pagy_countless(some_scope, ...)

Files

• countless.rb

Methods

All the methods in this module are prefixed with the "pagy_countless" string, to avoid any possible conflict with your own methods when you include the module in your controller. They are also all private, so they will not be available as actions. The methods prefixed with the "pagy_countless_get_" string are sub-methods/getter methods that are intended to be overridden, not used directly.

pagy_countless(collection, vars=nil)

This method is the same as the generic pagy method. (see the pagy doc)

pagy_countless_get_vars(_collection, vars)

This sub-method is similar to the pagy_get_vars sub-method, but it is called only by the pagy_countless method. (see the pagy_get_vars doc).

pagy_countless_get_items(collection, pagy)

This sub-method is similar to the pagy_get_items sub-method, but it is called only by the pagy_countless method. (see the pagy_get_items doc).

Notice: This method calls to_a on the collection in order to pop the eventual extra item from the result, so it returns an Array. That’s different than the regular pagy_get_items method which doesn’t need to call to_a on the collection.