aboutsummaryrefslogtreecommitdiffstats
path: root/activerecord/lib/active_record/migration/compatibility.rb
blob: 0edaaa0cf95891565132d8d914dd043c5f9bf025 (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
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
# frozen_string_literal: true

module ActiveRecord
  class Migration
    module Compatibility # :nodoc: all
      def self.find(version)
        version = version.to_s
        name = "V#{version.tr('.', '_')}"
        unless const_defined?(name)
          versions = constants.grep(/\AV[0-9_]+\z/).map { |s| s.to_s.delete("V").tr("_", ".").inspect }
          raise ArgumentError, "Unknown migration version #{version.inspect}; expected one of #{versions.sort.join(', ')}"
        end
        const_get(name)
      end

      V6_0 = Current

      class V5_2 < V6_0
      end

      class V5_1 < V5_2
        def change_column(table_name, column_name, type, options = {})
          if adapter_name == "PostgreSQL"
            clear_cache!
            sql = connection.send(:change_column_sql, table_name, column_name, type, options)
            execute "ALTER TABLE #{quote_table_name(table_name)} #{sql}"
            change_column_default(table_name, column_name, options[:default]) if options.key?(:default)
            change_column_null(table_name, column_name, options[:null], options[:default]) if options.key?(:null)
            change_column_comment(table_name, column_name, options[:comment]) if options.key?(:comment)
          else
            super
          end
        end

        def create_table(table_name, options = {})
          if adapter_name == "Mysql2"
            super(table_name, options: "ENGINE=InnoDB", **options)
          else
            super
          end
        end
      end

      class V5_0 < V5_1
        module TableDefinition
          def primary_key(name, type = :primary_key, **options)
            type = :integer if type == :primary_key
            super
          end

          def references(*args, **options)
            super(*args, type: :integer, **options)
          end
          alias :belongs_to :references
        end

        def create_table(table_name, options = {})
          if adapter_name == "PostgreSQL"
            if options[:id] == :uuid && !options.key?(:default)
              options[:default] = "uuid_generate_v4()"
            end
          end

          unless adapter_name == "Mysql2" && options[:id] == :bigint
            if [:integer, :bigint].include?(options[:id]) && !options.key?(:default)
              options[:default] = nil
            end
          end

          # Since 5.1 PostgreSQL adapter uses bigserial type for primary
          # keys by default and MySQL uses bigint. This compat layer makes old migrations utilize
          # serial/int type instead -- the way it used to work before 5.1.
          unless options.key?(:id)
            options[:id] = :integer
          end

          if block_given?
            super do |t|
              yield compatible_table_definition(t)
            end
          else
            super
          end
        end

        def change_table(table_name, options = {})
          if block_given?
            super do |t|
              yield compatible_table_definition(t)
            end
          else
            super
          end
        end

        def create_join_table(table_1, table_2, column_options: {}, **options)
          column_options.reverse_merge!(type: :integer)

          if block_given?
            super do |t|
              yield compatible_table_definition(t)
            end
          else
            super
          end
        end

        def add_column(table_name, column_name, type, options = {})
          if type == :primary_key
            type = :integer
            options[:primary_key] = true
          end
          super
        end

        def add_reference(table_name, ref_name, **options)
          super(table_name, ref_name, type: :integer, **options)
        end
        alias :add_belongs_to :add_reference

        private
          def compatible_table_definition(t)
            class << t
              prepend TableDefinition
            end
            t
          end
      end

      class V4_2 < V5_0
        module TableDefinition
          def references(*, **options)
            options[:index] ||= false
            super
          end
          alias :belongs_to :references

          def timestamps(**options)
            options[:null] = true if options[:null].nil?
            super
          end
        end

        def create_table(table_name, options = {})
          if block_given?
            super do |t|
              yield compatible_table_definition(t)
            end
          else
            super
          end
        end

        def change_table(table_name, options = {})
          if block_given?
            super do |t|
              yield compatible_table_definition(t)
            end
          else
            super
          end
        end

        def add_reference(*, **options)
          options[:index] ||= false
          super
        end
        alias :add_belongs_to :add_reference

        def add_timestamps(_, **options)
          options[:null] = true if options[:null].nil?
          super
        end

        def index_exists?(table_name, column_name, options = {})
          column_names = Array(column_name).map(&:to_s)
          options[:name] =
            if options[:name].present?
              options[:name].to_s
            else
              index_name(table_name, column: column_names)
            end
          super
        end

        def remove_index(table_name, options = {})
          options = { column: options } unless options.is_a?(Hash)
          options[:name] = index_name_for_remove(table_name, options)
          super(table_name, options)
        end

        private
          def compatible_table_definition(t)
            class << t
              prepend TableDefinition
            end
            super
          end

          def index_name_for_remove(table_name, options = {})
            index_name = index_name(table_name, options)

            unless index_name_exists?(table_name, index_name)
              if options.is_a?(Hash) && options.has_key?(:name)
                options_without_column = options.dup
                options_without_column.delete :column
                index_name_without_column = index_name(table_name, options_without_column)

                return index_name_without_column if index_name_exists?(table_name, index_name_without_column)
              end

              raise ArgumentError, "Index name '#{index_name}' on table '#{table_name}' does not exist"
            end

            index_name
          end
      end
    end
  end
end