Elasticsearch Rails Extra

This extra deals with the pagination of ElasticsearchRails response objects either by creating a Pagy object out of an (already paginated) ElasticsearchRails object or by creating the Pagy and ElasticsearchRails objects from the backend params.

Synopsis

See extras for general usage info.

Require the extra in the pagy.rb initializer:

require 'pagy/extras/elasticsearch_rails'

Passive mode

If you have an already paginated Elasticsearch::Model::Response::Response object, you can get the Pagy object out of it:

@response = Model.search('*', from: 0, size: 10, ...)
@pagy     = Pagy.new_from_elasticsearch_rails(@response, ...)

Active Mode

If you want Pagy to control the pagination, getting the page from the params, and returning both the Pagy and the Elasticsearch::Model::Response::Response objects automatically (from the backend params):

Extend your model:

extend Pagy::ElasticsearchRails

In a controller use pagy_search in place of search:

response         = Article.pagy_search(params[:q])
@pagy, @response = pagy_elasticsearch_rails(response, items: 10)

Files

• elasticsearch_rails.rb

Passive Mode

Pagy.new_from_elasticsearch_rails(response, …)

This constructor accepts an Elasticsearch::Model::Response::Response as the first argument, plus the usual optional variable hash. It sets the :items, :page and :count pagy variables extracted/calculated out of the Elasticsearch::Model::Response::Response object.

@response = Model.search('*', from: 0, size: 10, ...)
@pagy     = Pagy.new_from_elasticsearch_rails(@response, ...)

Notice: you have to take care of manually manage all the params for your search, however the method extracts/calculates the :items, :page and :count from the response object, so you don’t need to pass that again. If you prefer to manage the pagination automatically, see below.

Active mode

Pagy::ElasticsearchRails module

Extend your model with the Pagy::ElasticsearchRails micro-module:

extend Pagy::ElasticsearchRails

The Pagy::ElasticsearchRails adds the pagy_search class method that you must use in place of the standard search method when you want to paginate the search response.

pagy_search(…)

This method accepts the same arguments of the search method and you must use it in its place. This extra uses it in order to capture the arguments, automatically merging the calculated :from and :size options before passing them to the standard search method internally.

Variables

Variable	Description	Default
:elasticsearch_rails_search_method	customizable name of the search method	:pagy_search

Methods

This extra adds the pagy_elasticsearch_rails method to the Pagy::Backend to be used when you have to paginate a ElasticsearchRails object. It also adds a pagy_elasticsearch_rails_get_variables sub-method, used for easy customization of variables by overriding.

pagy_elasticsearch_rails(pagy_search_args, vars = {}})

This method is similar to the generic pagy method, but specialized for Elasticsearch Rails. (see the pagy doc)

It expects to receive a Model.pagy_search(...) result as the first argument and an optional hash of variables. It returns a paginated response.

You can use it in a couple of ways:

@pagy, @response = pagy_elasticsearch_rails(Model.pagy_search(params[:q]), ...)
...
records = @response.records
results = @response.results

# or directly with the collection you need (e.g. records)
@pagy, @records = pagy_elasticsearch_rails(Model.pagy_search(params[:q]).records, ...)

pagy_elasticsearch_rails_get_vars(array)

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