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Contents
# frozen_string_literal: true
require "attr_extras"
module SQL
# Example:
#
# indexed_case_stmt(:code, "DT", "AC", "XY")
#
# Will return the string:
#
# CASE code
# WHEN 'DT' THEN 1
# WHEN 'AC' THEN 2
# END
#
# Used for creating an explicit sort order in conjunction with a find:
#
# Description.where(code: codes).order(indexed_case_stmt(:code, codes))
#
class IndexedCaseStmt
pattr_initialize :column, :items
def generate
return if items.blank?
clauses = []
Array(items).each_with_index do |item, index|
clauses << "WHEN '#{item}' THEN #{index}"
end
"CASE #{column} #{clauses.join(' ')} END"
end
end
end
Version data entries
28 entries across 28 versions & 1 rubygems