module Sequel::DuplicateColumnsHandler

Constants

CALLER_ARGS

Public Instance Methods

on_duplicate_columns(handler = (raise Error, "Must provide either an argument or a block to on_duplicate_columns" unless block_given?; nil), &block) click to toggle source

Customize handling of duplicate columns for this dataset.

   # File lib/sequel/extensions/duplicate_columns_handler.rb
45 def on_duplicate_columns(handler = (raise Error, "Must provide either an argument or a block to on_duplicate_columns" unless block_given?; nil), &block)
46   raise Error, "Cannot provide both an argument and a block to on_duplicate_columns" if handler && block
47   clone(:on_duplicate_columns=>handler||block)
48 end

Private Instance Methods

columns=(cols) click to toggle source

Call handle_duplicate_columns if there are duplicate columns.

Calls superclass method
   # File lib/sequel/extensions/duplicate_columns_handler.rb
53 def columns=(cols)
54   if cols && cols.uniq.size != cols.size
55     handle_duplicate_columns(cols)
56   end
57   super
58 end
duplicate_columns_handler_type(cols) click to toggle source

Try to find dataset option for on_duplicate_columns. If not present on the dataset, use the on_duplicate_columns option on the database. If not present on the database, default to :warn.

   # File lib/sequel/extensions/duplicate_columns_handler.rb
75 def duplicate_columns_handler_type(cols)
76   handler = opts.fetch(:on_duplicate_columns){db.opts.fetch(:on_duplicate_columns, :warn)}
77 
78   if handler.respond_to?(:call)
79     handler.call(cols)
80   else
81     handler
82   end
83 end
handle_duplicate_columns(cols) click to toggle source

Invoke the appropriate behavior when duplicate columns are present.

   # File lib/sequel/extensions/duplicate_columns_handler.rb
61 def handle_duplicate_columns(cols)
62   message = "#{caller(*CALLER_ARGS).first}: One or more duplicate columns present in #{cols.inspect}"
63 
64   case duplicate_columns_handler_type(cols)
65   when :raise
66     raise DuplicateColumnError, message
67   when :warn
68     warn message
69   end
70 end