Merge pull request rails#51174 from Shopify/connection-less-quoting

Don't require an active connection for table and column quoting

activerecord/lib/active_record/attribute_methods/primary_key.rb

@@ -92,7 +92,7 @@ def composite_primary_key? # :nodoc:
           # Returns a quoted version of the primary key name, used to construct
           # SQL statements.
           def quoted_primary_key
-            @quoted_primary_key ||= connection.quote_column_name(primary_key)
+            @quoted_primary_key ||= adapter_class.quote_column_name(primary_key)
           end
 
           def reset_primary_key # :nodoc:

activerecord/lib/active_record/connection_adapters/abstract/quoting.rb

@@ -7,6 +7,67 @@ module ActiveRecord
   module ConnectionAdapters # :nodoc:
     # = Active Record Connection Adapters \Quoting
     module Quoting
+      extend ActiveSupport::Concern
+
+      module ClassMethods # :nodoc:
+        # Regexp for column names (with or without a table name prefix).
+        # Matches the following:
+        #
+        #   "#{table_name}.#{column_name}"
+        #   "#{column_name}"
+        def column_name_matcher
+          /
+            \A
+            (
+              (?:
+                # table_name.column_name | function(one or no argument)
+                ((?:\w+\.)?\w+ | \w+\((?:|\g<2>)\))
+              )
+              (?:(?:\s+AS)?\s+\w+)?
+            )
+            (?:\s*,\s*\g<1>)*
+            \z
+          /ix
+        end
+
+        # Regexp for column names with order (with or without a table name prefix,
+        # with or without various order modifiers). Matches the following:
+        #
+        #   "#{table_name}.#{column_name}"
+        #   "#{table_name}.#{column_name} #{direction}"
+        #   "#{table_name}.#{column_name} #{direction} NULLS FIRST"
+        #   "#{table_name}.#{column_name} NULLS LAST"
+        #   "#{column_name}"
+        #   "#{column_name} #{direction}"
+        #   "#{column_name} #{direction} NULLS FIRST"
+        #   "#{column_name} NULLS LAST"
+        def column_name_with_order_matcher
+          /
+            \A
+            (
+              (?:
+                # table_name.column_name | function(one or no argument)
+                ((?:\w+\.)?\w+ | \w+\((?:|\g<2>)\))
+              )
+              (?:\s+ASC|\s+DESC)?
+              (?:\s+NULLS\s+(?:FIRST|LAST))?
+            )
+            (?:\s*,\s*\g<1>)*
+            \z
+          /ix
+        end
+
+        # Quotes the column name. Must be implemented by subclasses
+        def quote_column_name(column_name)
+          raise NotImplementedError
+        end
+
+        # Quotes the table name. Defaults to column name quoting.
+        def quote_table_name(table_name)
+          quote_column_name(table_name)
+        end
+      end
+
       # Quotes the column value to help prevent
       # {SQL injection attacks}[https://en.wikipedia.org/wiki/SQL_injection].
       def quote(value)
@@ -71,14 +132,14 @@ def quote_string(s)
         s.gsub("\\", '\&\&').gsub("'", "''") # ' (for ruby-mode)
       end
 
-      # Quotes the column name. Defaults to no quoting.
+      # Quotes the column name.
       def quote_column_name(column_name)
-        column_name.to_s
+        self.class.quote_column_name(column_name)
       end
 
-      # Quotes the table name. Defaults to column name quoting.
+      # Quotes the table name.
       def quote_table_name(table_name)
-        quote_column_name(table_name)
+        self.class.quote_table_name(table_name)
       end
 
       # Override to return the quoted table name for assignment. Defaults to
@@ -159,59 +220,6 @@ def sanitize_as_sql_comment(value) # :nodoc:
         comment
       end
 
-      def column_name_matcher # :nodoc:
-        COLUMN_NAME
-      end
-
-      def column_name_with_order_matcher # :nodoc:
-        COLUMN_NAME_WITH_ORDER
-      end
-
-      # Regexp for column names (with or without a table name prefix).
-      # Matches the following:
-      #
-      #   "#{table_name}.#{column_name}"
-      #   "#{column_name}"
-      COLUMN_NAME = /
-        \A
-        (
-          (?:
-            # table_name.column_name | function(one or no argument)
-            ((?:\w+\.)?\w+ | \w+\((?:|\g<2>)\))
-          )
-          (?:(?:\s+AS)?\s+\w+)?
-        )
-        (?:\s*,\s*\g<1>)*
-        \z
-      /ix
-
-      # Regexp for column names with order (with or without a table name prefix,
-      # with or without various order modifiers). Matches the following:
-      #
-      #   "#{table_name}.#{column_name}"
-      #   "#{table_name}.#{column_name} #{direction}"
-      #   "#{table_name}.#{column_name} #{direction} NULLS FIRST"
-      #   "#{table_name}.#{column_name} NULLS LAST"
-      #   "#{column_name}"
-      #   "#{column_name} #{direction}"
-      #   "#{column_name} #{direction} NULLS FIRST"
-      #   "#{column_name} NULLS LAST"
-      COLUMN_NAME_WITH_ORDER = /
-        \A
-        (
-          (?:
-            # table_name.column_name | function(one or no argument)
-            ((?:\w+\.)?\w+ | \w+\((?:|\g<2>)\))
-          )
-          (?:\s+ASC|\s+DESC)?
-          (?:\s+NULLS\s+(?:FIRST|LAST))?
-        )
-        (?:\s*,\s*\g<1>)*
-        \z
-      /ix
-
-      private_constant :COLUMN_NAME, :COLUMN_NAME_WITH_ORDER
-
       private
         def type_casted_binds(binds)
           binds.map do |value|

activerecord/lib/active_record/connection_adapters/mysql/quoting.rb

@@ -6,9 +6,52 @@ module ActiveRecord
   module ConnectionAdapters
     module MySQL
       module Quoting # :nodoc:
+        extend ActiveSupport::Concern
+
         QUOTED_COLUMN_NAMES = Concurrent::Map.new # :nodoc:
         QUOTED_TABLE_NAMES = Concurrent::Map.new # :nodoc:
 
+        module ClassMethods # :nodoc:
+          def column_name_matcher
+            /
+              \A
+              (
+                (?:
+                  # `table_name`.`column_name` | function(one or no argument)
+                  ((?:\w+\.|`\w+`\.)?(?:\w+|`\w+`) | \w+\((?:|\g<2>)\))
+                )
+                (?:(?:\s+AS)?\s+(?:\w+|`\w+`))?
+              )
+              (?:\s*,\s*\g<1>)*
+              \z
+            /ix
+          end
+
+          def column_name_with_order_matcher
+            /
+              \A
+              (
+                (?:
+                  # `table_name`.`column_name` | function(one or no argument)
+                  ((?:\w+\.|`\w+`\.)?(?:\w+|`\w+`) | \w+\((?:|\g<2>)\))
+                )
+                (?:\s+COLLATE\s+(?:\w+|"\w+"))?
+                (?:\s+ASC|\s+DESC)?
+              )
+              (?:\s*,\s*\g<1>)*
+              \z
+            /ix
+          end
+
+          def quote_column_name(name)
+            QUOTED_COLUMN_NAMES[name] ||= "`#{name.to_s.gsub('`', '``')}`".freeze
+          end
+
+          def quote_table_name(name)
+            QUOTED_TABLE_NAMES[name] ||= "`#{name.to_s.gsub('`', '``').gsub(".", "`.`")}`".freeze
+          end
+        end
+
         def cast_bound_value(value)
           case value
           when Rational
@@ -26,14 +69,6 @@ def cast_bound_value(value)
           end
         end
 
-        def quote_column_name(name)
-          QUOTED_COLUMN_NAMES[name] ||= "`#{super.gsub('`', '``')}`".freeze
-        end
-
-        def quote_table_name(name)
-          QUOTED_TABLE_NAMES[name] ||= -super.gsub(".", "`.`").freeze
-        end
-
         def unquoted_true
           1
         end
@@ -81,43 +116,6 @@ def type_cast(value) # :nodoc:
             super
           end
         end
-
-        def column_name_matcher
-          COLUMN_NAME
-        end
-
-        def column_name_with_order_matcher
-          COLUMN_NAME_WITH_ORDER
-        end
-
-        COLUMN_NAME = /
-          \A
-          (
-            (?:
-              # `table_name`.`column_name` | function(one or no argument)
-              ((?:\w+\.|`\w+`\.)?(?:\w+|`\w+`) | \w+\((?:|\g<2>)\))
-            )
-            (?:(?:\s+AS)?\s+(?:\w+|`\w+`))?
-          )
-          (?:\s*,\s*\g<1>)*
-          \z
-        /ix
-
-        COLUMN_NAME_WITH_ORDER = /
-          \A
-          (
-            (?:
-              # `table_name`.`column_name` | function(one or no argument)
-              ((?:\w+\.|`\w+`\.)?(?:\w+|`\w+`) | \w+\((?:|\g<2>)\))
-            )
-            (?:\s+COLLATE\s+(?:\w+|"\w+"))?
-            (?:\s+ASC|\s+DESC)?
-          )
-          (?:\s*,\s*\g<1>)*
-          \z
-        /ix
-
-        private_constant :COLUMN_NAME, :COLUMN_NAME_WITH_ORDER
       end
     end
   end