Class: RuboCop::Cop::Spbtv::Postgres::ChangeColumn

Inherits:
RuboCop::Cop
  • Object
show all
Defined in:
lib/rubocop/cop/spbtv/postgres/change_column.rb

Overview

Do not change column.

It is not strictly unsafe for all changes. Changing the length of a varchar, for example, does not lock a table. But if column type change requires a rewrite or not depends on the datatype, in this case this operation requires updating each row of the table. As workaround, you can add a new column with needed type, change the code to write to both columns, and backfill the new column.

Examples:

@bad
change_column :suppliers, :name, :string, limit: 80

Constant Summary collapse

MSG = 
'Do not change column.'.freeze

Instance Method Summary collapse

Instance Method Details

#on_send(node) ⇒ Object 



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# File 'lib/rubocop/cop/spbtv/postgres/change_column.rb', line 24

def on_send(node)
  _, _, * = *node
  if node.command?(:change_column)
    add_offense(node, :selector, MSG)
  end
end