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# data_hash

data_hash plucks a hash of key-value pairs from the pagy object. It is useful for exporting pagination data to JavaScript frameworks like Vue.js, React.js, etc.

It works with all paginators

Controller
@pagy, @records = pagy(:offset, collection, **options)
pagy_hash       = @pagy.data_hash(data_keys: %i[page previous next previous_url next_url ...])
#=> { page: 3, previous: 2, next: 4, previous_url: ... } 
render json: { data: @records, pagy: pagy_hash }

>> include Pagy::Console
=> Object

>> @pagy, @records = pagy(:offset, collection.new, page: 3)
=> [#<Pagy::Offset:0x00007ff5843036e0 @count=1000, @from=41, @in=20, @in_range=true, @last=50, @limit=20, @next=4, @offset=40, @options={limit: 20, limit_key: "limit", page_key: "page", page: 3, count: 1000}, @page=3, @previous=2, @request=#<Pagy::Request:0x00007ff58497f230 @base_url="http://www.example.com", @cookie=nil, @jsonapi=nil, @path="/path", @query={example: "123"}>, @to=60>, [41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60]]

>> @pagy.data_hash(data_keys: %i[page previous next previous_url next_url])
=> {page: 3, previous: 2, next: 4, previous_url: "/path?example=123&page=2", next_url: "/path?example=123&page=4"}

data_keys
- For efficiency, always set the :data_keys option to restrict the output to ONLY the keys you need. Note that you can also add other pagy method names not included in the default list below:
  - :count
  - :first_url
  - :from
  - :in
  - :last
  - :last_url
  - :limit
  - :next
  - :next_url
  - :options
  - :page
  - :page_url
  - :pages
  - :previous
  - :previous_url
  - :to
  - :url_template

You may not need it for simple cases!

Consider using the available :*_url data_keys directly instead of relying on the :url_template.