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Any interest on "upgrade_table" for migration?
Reported by Felix Sun | July 19th, 2010 @ 04:07 AM
It's like the datamapper "rake db:autoupgrade".
Write this in your migration OR initializer of your plugin/gem if the plugin/gem require a table with some columns to exist.
ActiveRecord::Migration.upgrade_table :products do |t|
t.string :code, :null => false
t.string :name, :limit => 200
t.body :text
t.timestamps
end
In this example, the products table won't be dropped if there is
existing one in database,
If there are no "name" column, It will only add that column to the
table.
If it has the exactly the same thing in the database, it will do nothing.
If there are more interest on this, I will continue to make a patch for this, Else I'll just paste the code here:
require 'active_record/connection_adapters/abstract/schema_definitions'
require 'active_record/connection_adapters/abstract/schema_statements'
module ActiveRecord
module ConnectionAdapters # :nodoc:
module SchemaStatements
class SafeTable < Table
def initialize(table_name, base)
super(table_name, base)
@base.create_table(@table_name) unless @base.table_exists?(@table_name)
end
def column(column_name, type, options = {})
return super(column_name, type, options) unless @base.column_exists?(@table_name, column_name)
changed_properties = changed_properties(column_name, options)
return if changed_properties.empty?
change(column_name, type, options)
change_default(column_name, column_default) if changed_properties.include?(:default)
end
def timestamps
return super unless @base.column_exists?(@table_name, :created_at)
end
# Adds a column or columns of a specified type
# ===== Examples
# t.string(:goat)
# t.string(:goat, :sheep)
%w( string text integer float decimal datetime timestamp time date binary boolean ).each do |column_type|
class_eval <<-EOV, __FILE__, __LINE__ + 1
def #{column_type}(*args) # def string(*args)
options = args.extract_options! # options = args.extract_options!
column_names = args # column_names = args
#
column_names.each do |name| # column_names.each do |name|
column = ColumnDefinition.new(@base, name, '#{column_type}') # column = ColumnDefinition.new(@base, name, 'string')
if options[:limit] # if options[:limit]
column.limit = options[:limit] # column.limit = options[:limit]
elsif native['#{column_type}'.to_sym].is_a?(Hash) # elsif native['string'.to_sym].is_a?(Hash)
column.limit = native['#{column_type}'.to_sym][:limit] # column.limit = native['string'.to_sym][:limit]
end # end
column.precision = options[:precision] # column.precision = options[:precision]
column.scale = options[:scale] # column.scale = options[:scale]
column.default = options[:default] # column.default = options[:default]
column.null = options[:null] # column.null = options[:null]
self.column(name, column.sql_type, options) # self.column(name, column.sql_type, options)
end # end
end # end
EOV
end
private
def changed_properties(column_name, new_options={})
original_column = @base.columns(@table_name).detect {|c| c.name.to_s == column_name.to_s }
[:default, :limit, :null, :precision, :scale].select do |attr|
original_value = original_column.send(attr)
new_value = new_options[attr]
new_value && new_value.to_s != original_value.to_s
end
end
end
def upgrade_table(table_name)
yield SafeTable.new(table_name, self)
end
end # SchemaStatements
end # ConnectionAdapters
end # ActiveRecord
Comments and changes to this ticket
-
Santiago Pastorino February 2nd, 2011 @ 04:35 PM
- State changed from new to open
This issue has been automatically marked as stale because it has not been commented on for at least three months.
The resources of the Rails core team are limited, and so we are asking for your help. If you can still reproduce this error on the 3-0-stable branch or on master, please reply with all of the information you have about it and add "[state:open]" to your comment. This will reopen the ticket for review. Likewise, if you feel that this is a very important feature for Rails to include, please reply with your explanation so we can consider it.
Thank you for all your contributions, and we hope you will understand this step to focus our efforts where they are most helpful.
-
Santiago Pastorino February 2nd, 2011 @ 04:35 PM
- State changed from open to stale
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