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Contents
module Locomotive
module Concerns
module ContentEntry
module NextPrevious
# Return the next content entry based on the order defined in the parent content type.
#
# @param [ Object ] The next content entry or nil if not found
#
def next
next_or_previous :gt
end
# Return the previous content entry based on the order defined in the parent content type.
#
# @param [ Object ] The previous content entry or nil if not found
#
def previous
next_or_previous :lt
end
protected
# Retrieve the next or the previous entry following the order
# defined in the parent content type.
#
# @param [ Symbol ] :gt for the next element, :lt for the previous element
#
# @return [ Object ] The next or previous content entry or nil if none
#
def next_or_previous(matcher = :gt)
# the matchers is supposed to be fine for the default direction, meaning 'asc'
# if the direction is not ascending, we need to reverse the matcher
matcher = matcher == :gt ? :lt : :gt if self.content_type.order_direction != 'asc'
attribute = self.content_type.order_by_attribute
direction = matcher == :gt ? 'asc' : 'desc'
criterion = attribute.to_sym.send(matcher)
value = self.send(attribute.to_sym)
order_by = [attribute, direction]
self.class.next_or_previous({ criterion => value }, order_by).first
end
end
end
end
end
Version data entries
42 entries across 42 versions & 1 rubygems