module Sequel::DuplicateColumnsHandler

Constants

CALLER_ARGS

:nocov:

Public Instance Methods

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

Customize handling of duplicate columns for this dataset.

   # File lib/sequel/extensions/duplicate_columns_handler.rb
47 def on_duplicate_columns(handler = (raise Error, "Must provide either an argument or a block to on_duplicate_columns" unless defined?(yield); nil), &block)
48   raise Error, "Cannot provide both an argument and a block to on_duplicate_columns" if handler && block
49   clone(:on_duplicate_columns=>handler||block)
50 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
55 def columns=(cols)
56   if cols && cols.uniq.size != cols.size
57     handle_duplicate_columns(cols)
58   end
59   super
60 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
77 def duplicate_columns_handler_type(cols)
78   handler = opts.fetch(:on_duplicate_columns){db.opts.fetch(:on_duplicate_columns, :warn)}
79 
80   if handler.respond_to?(:call)
81     handler.call(cols)
82   else
83     handler
84   end
85 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
63 def handle_duplicate_columns(cols)
64   message = "#{caller(*CALLER_ARGS).first}: One or more duplicate columns present in #{cols.inspect}"
65 
66   case duplicate_columns_handler_type(cols)
67   when :raise
68     raise DuplicateColumnError, message
69   when :warn
70     warn message
71   end
72 end