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Contents
module Clevic
# Provides a nice way of getting to Sequel::Dataset's
# opts[:order] information
#
# Including class must call dataset= before calling order_attributes
module OrderedDataset
# returns a collection of [ attribute, (1|-1) ]
# where 1 is forward/asc (>) and -1 is backward/desc (<)
def order_attributes
if @order_attributes.nil?
@order_attributes =
dataset.opts[:order].map do |order_expr|
case order_expr
when Symbol
[ order_expr, 1 ]
when Sequel::SQL::OrderedExpression
[ order_expr.expression, order_expr.descending ? -1 : 1 ]
else
raise "unknown order_expr: #{order_expr.inspect}"
end
end
end
@order_attributes
end
attr_reader :dataset
# Set default dataset ordering to primary key if it doesn't
# already have an order.
def dataset=( other )
@dataset =
if other.opts[:order].nil?
other.order( other.model.primary_key )
else
other
end
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems