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require 'active_support/core_ext/module/delegation'
# Pagination is used to navigate paginateable collections
module LHS::Pagination
class Base
DEFAULT_LIMIT = 100
delegate :_record, to: :data
attr_accessor :data
def initialize(data)
self.data = data
end
def total
data._raw.dig(*_record.total_key) || 0
end
# as standard in Rails' ActiveRecord count is not summing up, but using the number provided from data source
alias count total
def limit
data._raw.dig(*_record.limit_key(:body)) || DEFAULT_LIMIT
end
def offset
data._raw.dig(*_record.pagination_key(:body)) || self.class::DEFAULT_OFFSET
end
alias current_page offset
alias start offset
def pages_left
total_pages - current_page
end
def next_offset(_step = 1)
raise 'to be implemented in subclass'
end
def current_page
raise 'to be implemented in subclass'
end
def first_page
1
end
def last_page
total_pages
end
def next?
data._raw[:next].present?
end
def previous?
data._raw[:previous].present?
end
def prev_page
current_page - 1
end
def next_page
current_page + 1
end
def limit_value
limit
end
def total_pages
(total.to_f / limit).ceil
end
def self.page_to_offset(page, _limit)
page.to_i
end
end
end
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20 entries across 20 versions & 1 rubygems