Module: Kaminari::PaginatableWithoutCount

Defined in:
lib/kaminari/activerecord/active_record_relation_methods.rb,
lib/kaminari/activerecord/active_record_relation_methods.rb

Overview

A module that makes AR::Relation paginatable without having to cast another SELECT COUNT query

Defined Under Namespace

Modules: LimitValueSetter

Instance Method Summary collapse

Instance Method Details

#last_page? ⇒ Boolean

The page wouldn’t be the last page if there’s “limit + 1” record

Returns:

  • (Boolean) 


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# File 'lib/kaminari/activerecord/active_record_relation_methods.rb', line 109

def last_page?
  !out_of_range? && !@_has_next
end

#load ⇒ Object

Overwrite AR::Relation#load to actually load one more record to judge if the page has next page then store the result in @_has_next ivar



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# File 'lib/kaminari/activerecord/active_record_relation_methods.rb', line 90

def load
  if loaded? || limit_value.nil?
    super
  else
    set_limit_value limit_value + 1
    super
    set_limit_value limit_value - 1

    if @records.any?
      @records = @records.dup if (frozen = @records.frozen?)
      @_has_next = !!@records.delete_at(limit_value)
      @records.freeze if frozen
    end

    self
  end
end

#out_of_range? ⇒ Boolean

Empty relation needs no pagination

Returns:

  • (Boolean) 


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# File 'lib/kaminari/activerecord/active_record_relation_methods.rb', line 114

def out_of_range?
  load unless loaded?
  @records.empty?
end

#total_count ⇒ Object

Force to raise an exception if #total_count is called explicitly.



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# File 'lib/kaminari/activerecord/active_record_relation_methods.rb', line 120

def total_count
  raise "This scope is marked as a non-count paginable scope and can't be used in combination " \
        "with `#paginate' or `#page_entries_info'. Use #link_to_next_page or #link_to_previous_page instead."
end