Class: GraphQL::Connections::PrimaryKey::Base

Inherits:
Base
  • Object
show all
Defined in:
lib/graphql/connections/primary_key/base.rb

Overview

Base class for PrimaryKey pagination implementations

Direct Known Subclasses

Desc

Constant Summary collapse

COMPARABLE_METHODS = 
%i[
  gt lt lteq gteq
].freeze

Instance Attribute Summary

Attributes inherited from Base

#opaque_cursor

Instance Method Summary collapse

Methods inherited from Base

#nodes, #primary_key

Constructor Details

#initialize(*args, primary_key: nil, **kwargs) ⇒ Base

Returns a new instance of Base.



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# File 'lib/graphql/connections/primary_key/base.rb', line 12

def initialize(*args, primary_key: nil, **kwargs)
  @primary_key = primary_key

  super(*args, **kwargs)
end

Instance Method Details

#cursor_for(item) ⇒ Object 



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# File 'lib/graphql/connections/primary_key/base.rb', line 42

def cursor_for(item)
  cursor = serialize(item[primary_key])
  cursor = encode(cursor) if opaque_cursor
  cursor
end

#has_next_page ⇒ Object 



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# File 'lib/graphql/connections/primary_key/base.rb', line 30

def has_next_page
  return false if nodes.empty?

  if first
    items_exist?(type: :query, search: nodes.last[primary_key], page_type: :next)
  elsif before
    items_exist?(type: :cursor, search: before_cursor, page_type: :next)
  else
    false
  end
end

#has_previous_page ⇒ Object 



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# File 'lib/graphql/connections/primary_key/base.rb', line 18

def has_previous_page
  return false if nodes.empty?

  if last
    items_exist?(type: :query, search: nodes.first[primary_key], page_type: :previous)
  elsif after
    items_exist?(type: :cursor, search: after_cursor, page_type: :previous)
  else
    false
  end
end