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Contents
# Pagination is used to navigate paginateable collections
class LHS::Pagination
DEFAULT_LIMIT = 100
delegate :_record, to: :data
attr_accessor :data
def initialize(data)
self.data = data
end
# as standard in Rails' ActiveRecord count is not summing up, but using the number provided from data source
def count
total
end
def total
data._raw[_record.total_key.to_sym]
end
def limit
data._raw[_record.limit_key.to_sym] || LHS::Pagination::DEFAULT_LIMIT
end
def offset
data._raw[_record.pagination_key.to_sym].presence || 0
end
alias current_page offset
alias start offset
def pages_left
total_pages - current_page
end
def next_offset
fail 'to be implemented in subclass'
end
def current_page
fail 'to be implemented in subclass'
end
def first_page
1
end
def last_page
total_pages
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
class LHS::PagePagination < LHS::Pagination
def current_page
offset
end
def next_offset
current_page + 1
end
end
class LHS::StartPagination < LHS::Pagination
def current_page
(offset + limit - 1) / limit
end
def next_offset
offset + limit
end
def self.page_to_offset(page, limit = LHS::Pagination::DEFAULT_LIMIT)
(page.to_i - 1) * limit.to_i + 1
end
end
class LHS::OffsetPagination < LHS::Pagination
def current_page
(offset + limit) / limit
end
def next_offset
offset + limit
end
def self.page_to_offset(page, limit = LHS::Pagination::DEFAULT_LIMIT)
(page.to_i - 1) * limit.to_i
end
end
Version data entries
17 entries across 17 versions & 1 rubygems