aboutsummaryrefslogtreecommitdiffstats
path: root/activerecord/lib/active_record/schema_migration.rb
blob: dec7fee98642ea093dc67b6b775698a6a9c7bdd6 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
# frozen_string_literal: true

require "active_record/scoping/default"
require "active_record/scoping/named"

module ActiveRecord
  # This class is used to create a table that keeps track of which migrations
  # have been applied to a given database. When a migration is run, its schema
  # number is inserted in to the `SchemaMigration.table_name` so it doesn't need
  # to be executed the next time.
  class SchemaMigration < ActiveRecord::Base # :nodoc:
    class << self
      def _internal?
        true
      end

      def primary_key
        "version"
      end

      def table_name
        "#{table_name_prefix}#{schema_migrations_table_name}#{table_name_suffix}"
      end

      def create_table
        unless table_exists?
          version_options = connection.internal_string_options_for_primary_key

          connection.create_table(table_name, id: false) do |t|
            t.string :version, version_options
          end
        end
      end

      def drop_table
        connection.drop_table table_name, if_exists: true
      end

      def normalize_migration_number(number)
        "%.3d" % number.to_i
      end

      def normalized_versions
        all_versions.map { |v| normalize_migration_number v }
      end

      def all_versions
        order(:version).pluck(:version)
      end
    end

    def version
      super.to_i
    end
  end
end