aboutsummaryrefslogtreecommitdiffstats
path: root/activerecord/lib/active_record/counter_cache.rb
blob: aad30b40eabafb4fba3da3dcd4a50c0cdc095c3b (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
# frozen_string_literal: true

module ActiveRecord
  # = Active Record Counter Cache
  module CounterCache
    extend ActiveSupport::Concern

    module ClassMethods
      # Resets one or more counter caches to their correct value using an SQL
      # count query. This is useful when adding new counter caches, or if the
      # counter has been corrupted or modified directly by SQL.
      #
      # ==== Parameters
      #
      # * +id+ - The id of the object you wish to reset a counter on.
      # * +counters+ - One or more association counters to reset. Association name or counter name can be given.
      # * <tt>:touch</tt> - Touch timestamp columns when updating.
      #   Pass +true+ to touch +updated_at+ and/or +updated_on+. Pass a symbol to
      #   touch that column or an array of symbols to touch just those ones.
      #
      # ==== Examples
      #
      #   # For the Post with id #1, reset the comments_count
      #   Post.reset_counters(1, :comments)
      #
      #   # Like above, but also touch the +updated_at+ and/or +updated_on+
      #   # attributes.
      #   Post.reset_counters(1, :comments, touch: true)
      def reset_counters(id, *counters, touch: nil)
        object = find(id)

        counters.each do |counter_association|
          has_many_association = _reflect_on_association(counter_association)
          unless has_many_association
            has_many = reflect_on_all_associations(:has_many)
            has_many_association = has_many.find { |association| association.counter_cache_column && association.counter_cache_column.to_sym == counter_association.to_sym }
            counter_association = has_many_association.plural_name if has_many_association
          end
          raise ArgumentError, "'#{name}' has no association called '#{counter_association}'" unless has_many_association

          if has_many_association.is_a? ActiveRecord::Reflection::ThroughReflection
            has_many_association = has_many_association.through_reflection
          end

          foreign_key  = has_many_association.foreign_key.to_s
          child_class  = has_many_association.klass
          reflection   = child_class._reflections.values.find { |e| e.belongs_to? && e.foreign_key.to_s == foreign_key && e.options[:counter_cache].present? }
          counter_name = reflection.counter_cache_column

          updates = { counter_name => object.send(counter_association).count(:all) }

          if touch
            names = touch if touch != true
            updates.merge!(touch_attributes_with_time(*names))
          end

          unscoped.where(primary_key => object.id).update_all(updates)
        end

        true
      end

      # A generic "counter updater" implementation, intended primarily to be
      # used by #increment_counter and #decrement_counter, but which may also
      # be useful on its own. It simply does a direct SQL update for the record
      # with the given ID, altering the given hash of counters by the amount
      # given by the corresponding value:
      #
      # ==== Parameters
      #
      # * +id+ - The id of the object you wish to update a counter on or an array of ids.
      # * +counters+ - A Hash containing the names of the fields
      #   to update as keys and the amount to update the field by as values.
      # * <tt>:touch</tt> option - Touch timestamp columns when updating.
      #   If attribute names are passed, they are updated along with updated_at/on
      #   attributes.
      #
      # ==== Examples
      #
      #   # For the Post with id of 5, decrement the comment_count by 1, and
      #   # increment the action_count by 1
      #   Post.update_counters 5, comment_count: -1, action_count: 1
      #   # Executes the following SQL:
      #   # UPDATE posts
      #   #    SET comment_count = COALESCE(comment_count, 0) - 1,
      #   #        action_count = COALESCE(action_count, 0) + 1
      #   #  WHERE id = 5
      #
      #   # For the Posts with id of 10 and 15, increment the comment_count by 1
      #   Post.update_counters [10, 15], comment_count: 1
      #   # Executes the following SQL:
      #   # UPDATE posts
      #   #    SET comment_count = COALESCE(comment_count, 0) + 1
      #   #  WHERE id IN (10, 15)
      #
      #   # For the Posts with id of 10 and 15, increment the comment_count by 1
      #   # and update the updated_at value for each counter.
      #   Post.update_counters [10, 15], comment_count: 1, touch: true
      #   # Executes the following SQL:
      #   # UPDATE posts
      #   #    SET comment_count = COALESCE(comment_count, 0) + 1,
      #   #    `updated_at` = '2016-10-13T09:59:23-05:00'
      #   #  WHERE id IN (10, 15)
      def update_counters(id, counters)
        unscoped.where!(primary_key => id).update_counters(counters)
      end

      # Increment a numeric field by one, via a direct SQL update.
      #
      # This method is used primarily for maintaining counter_cache columns that are
      # used to store aggregate values. For example, a +DiscussionBoard+ may cache
      # posts_count and comments_count to avoid running an SQL query to calculate the
      # number of posts and comments there are, each time it is displayed.
      #
      # ==== Parameters
      #
      # * +counter_name+ - The name of the field that should be incremented.
      # * +id+ - The id of the object that should be incremented or an array of ids.
      # * <tt>:touch</tt> - Touch timestamp columns when updating.
      #   Pass +true+ to touch +updated_at+ and/or +updated_on+. Pass a symbol to
      #   touch that column or an array of symbols to touch just those ones.
      #
      # ==== Examples
      #
      #   # Increment the posts_count column for the record with an id of 5
      #   DiscussionBoard.increment_counter(:posts_count, 5)
      #
      #   # Increment the posts_count column for the record with an id of 5
      #   # and update the updated_at value.
      #   DiscussionBoard.increment_counter(:posts_count, 5, touch: true)
      def increment_counter(counter_name, id, touch: nil)
        update_counters(id, counter_name => 1, touch: touch)
      end

      # Decrement a numeric field by one, via a direct SQL update.
      #
      # This works the same as #increment_counter but reduces the column value by
      # 1 instead of increasing it.
      #
      # ==== Parameters
      #
      # * +counter_name+ - The name of the field that should be decremented.
      # * +id+ - The id of the object that should be decremented or an array of ids.
      # * <tt>:touch</tt> - Touch timestamp columns when updating.
      #   Pass +true+ to touch +updated_at+ and/or +updated_on+. Pass a symbol to
      #   touch that column or an array of symbols to touch just those ones.
      #
      # ==== Examples
      #
      #   # Decrement the posts_count column for the record with an id of 5
      #   DiscussionBoard.decrement_counter(:posts_count, 5)
      #
      #   # Decrement the posts_count column for the record with an id of 5
      #   # and update the updated_at value.
      #   DiscussionBoard.decrement_counter(:posts_count, 5, touch: true)
      def decrement_counter(counter_name, id, touch: nil)
        update_counters(id, counter_name => -1, touch: touch)
      end
    end

    private
      def _create_record(attribute_names = self.attribute_names)
        id = super

        each_counter_cached_associations do |association|
          if send(association.reflection.name)
            association.increment_counters
          end
        end

        id
      end

      def destroy_row
        affected_rows = super

        if affected_rows > 0
          each_counter_cached_associations do |association|
            foreign_key = association.reflection.foreign_key.to_sym
            unless destroyed_by_association && destroyed_by_association.foreign_key.to_sym == foreign_key
              if send(association.reflection.name)
                association.decrement_counters
              end
            end
          end
        end

        affected_rows
      end

      def each_counter_cached_associations
        _reflections.each do |name, reflection|
          yield association(name.to_sym) if reflection.belongs_to? && reflection.counter_cache_column
        end
      end
  end
end