Class: CursorPager::OrderValues

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Includes:
Enumerable
Defined in:
lib/cursor_pager/order_values.rb

Overview

OrderValue collection wrapper.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(collection = []) ⇒ OrderValues

Returns a new instance of OrderValues.



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# File 'lib/cursor_pager/order_values.rb', line 29

def initialize(collection = [])
  @collection = collection
end

Class Method Details

.from_relation(relation) ⇒ Object

A relation’s order_values can either be an empty array, an array including just one string, or an array of arel ordering nodes.



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# File 'lib/cursor_pager/order_values.rb', line 15

def self.from_relation(relation)
  arel_order_values = relation.order_values.uniq.reject(&:blank?)
  collection = arel_order_values.flat_map do |value|
    case value
    when Arel::Nodes::Ordering
      OrderValue.from_arel_node(relation, value)
    when String
      OrderValue.from_order_string(relation, value)
    end
  end

  new(collection)
end

Instance Method Details

#direction ⇒ Object 



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# File 'lib/cursor_pager/order_values.rb', line 33

def direction
  @collection.first&.direction
end

#order_string ⇒ Object 



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# File 'lib/cursor_pager/order_values.rb', line 37

def order_string
  @collection.map(&:order_string).join(", ")
end