aboutsummaryrefslogtreecommitdiffstats
path: root/railties/lib/rails/generators/generated_attribute.rb
blob: a8f7729fd34107771c150cff66bfac2cb506ad2c (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
# frozen_string_literal: true

require "active_support/time"

module Rails
  module Generators
    class GeneratedAttribute # :nodoc:
      INDEX_OPTIONS = %w(index uniq)
      UNIQ_INDEX_OPTIONS = %w(uniq)

      attr_accessor :name, :type
      attr_reader   :attr_options
      attr_writer   :index_name

      class << self
        def parse(column_definition)
          name, type, has_index = column_definition.split(":")

          # if user provided "name:index" instead of "name:string:index"
          # type should be set blank so GeneratedAttribute's constructor
          # could set it to :string
          has_index, type = type, nil if INDEX_OPTIONS.include?(type)

          type, attr_options = *parse_type_and_options(type)
          type = type.to_sym if type

          if type && reference?(type)
            if UNIQ_INDEX_OPTIONS.include?(has_index)
              attr_options[:index] = { unique: true }
            end
          end

          new(name, type, has_index, attr_options)
        end

        def reference?(type)
          [:references, :belongs_to].include? type
        end

        private

          # parse possible attribute options like :limit for string/text/binary/integer, :precision/:scale for decimals or :polymorphic for references/belongs_to
          # when declaring options curly brackets should be used
          def parse_type_and_options(type)
            case type
            when /(string|text|binary|integer)\{(\d+)\}/
              return $1, limit: $2.to_i
            when /decimal\{(\d+)[,.-](\d+)\}/
              return :decimal, precision: $1.to_i, scale: $2.to_i
            when /(references|belongs_to)\{(.+)\}/
              type = $1
              provided_options = $2.split(/[,.-]/)
              options = Hash[provided_options.map { |opt| [opt.to_sym, true] }]
              return type, options
            else
              return type, {}
            end
          end
      end

      def initialize(name, type = nil, index_type = false, attr_options = {})
        @name           = name
        @type           = type || :string
        @has_index      = INDEX_OPTIONS.include?(index_type)
        @has_uniq_index = UNIQ_INDEX_OPTIONS.include?(index_type)
        @attr_options   = attr_options
      end

      def field_type
        @field_type ||= case type
                        when :integer              then :number_field
                        when :float, :decimal      then :text_field
                        when :time                 then :time_select
                        when :datetime, :timestamp then :datetime_select
                        when :date                 then :date_select
                        when :text                 then :text_area
                        when :boolean              then :check_box
                        else
                          :text_field
        end
      end

      def default
        @default ||= case type
                     when :integer                     then 1
                     when :float                       then 1.5
                     when :decimal                     then "9.99"
                     when :datetime, :timestamp, :time then Time.now.to_s(:db)
                     when :date                        then Date.today.to_s(:db)
                     when :string                      then name == "type" ? "" : "MyString"
                     when :text                        then "MyText"
                     when :boolean                     then false
                     when :references, :belongs_to     then nil
                     else
                       ""
        end
      end

      def plural_name
        name.sub(/_id$/, "").pluralize
      end

      def singular_name
        name.sub(/_id$/, "").singularize
      end

      def human_name
        name.humanize
      end

      def index_name
        @index_name ||= if polymorphic?
          %w(id type).map { |t| "#{name}_#{t}" }
        else
          column_name
        end
      end

      def column_name
        @column_name ||= reference? ? "#{name}_id" : name
      end

      def foreign_key?
        !!(name =~ /_id$/)
      end

      def reference?
        self.class.reference?(type)
      end

      def polymorphic?
        attr_options[:polymorphic]
      end

      def required?
        attr_options[:required]
      end

      def has_index?
        @has_index
      end

      def has_uniq_index?
        @has_uniq_index
      end

      def password_digest?
        name == "password" && type == :digest
      end

      def token?
        type == :token
      end

      def inject_options
        (+"").tap { |s| options_for_migration.each { |k, v| s << ", #{k}: #{v.inspect}" } }
      end

      def inject_index_options
        has_uniq_index? ? ", unique: true" : ""
      end

      def options_for_migration
        @attr_options.dup.tap do |options|
          if required?
            options.delete(:required)
            options[:null] = false
          end

          if reference? && !polymorphic?
            options[:foreign_key] = true
          end
        end
      end
    end
  end
end