Clear schema cache when a table is created/dropped/renamed

Otherwise `Model.table_exists?` returns the staled cache result.

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

@@ -310,6 +310,8 @@ def create_table(table_name, id: :primary_key, primary_key: nil, force: nil, **o
 
         if force
           drop_table(table_name, force: force, if_exists: true)
+        else
+          schema_cache.clear_data_source_cache!(table_name.to_s)
         end
 
         result = execute schema_creation.accept td
@@ -499,6 +501,7 @@ def rename_table(table_name, new_name)
       # it can be helpful to provide these in a migration's +change+ method so it can be reverted.
       # In that case, +options+ and the block will be used by #create_table.
       def drop_table(table_name, options = {})
+        schema_cache.clear_data_source_cache!(table_name.to_s)
         execute "DROP TABLE#{' IF EXISTS' if options[:if_exists]} #{quote_table_name(table_name)}"
       end
 

activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb

@@ -289,6 +289,8 @@ def change_table_comment(table_name, comment_or_changes) # :nodoc:
       # Example:
       #   rename_table('octopuses', 'octopi')
       def rename_table(table_name, new_name)
+        schema_cache.clear_data_source_cache!(table_name.to_s)
+        schema_cache.clear_data_source_cache!(new_name.to_s)
         execute "RENAME TABLE #{quote_table_name(table_name)} TO #{quote_table_name(new_name)}"
         rename_table_indexes(table_name, new_name)
       end
@@ -309,6 +311,7 @@ def rename_table(table_name, new_name)
       # it can be helpful to provide these in a migration's +change+ method so it can be reverted.
       # In that case, +options+ and the block will be used by create_table.
       def drop_table(table_name, options = {})
+        schema_cache.clear_data_source_cache!(table_name.to_s)
         execute "DROP#{' TEMPORARY' if options[:temporary]} TABLE#{' IF EXISTS' if options[:if_exists]} #{quote_table_name(table_name)}#{' CASCADE' if options[:force] == :cascade}"
       end
 

activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb

@@ -55,6 +55,7 @@ def drop_database(name) #:nodoc:
         end
 
         def drop_table(table_name, options = {}) # :nodoc:
+          schema_cache.clear_data_source_cache!(table_name.to_s)
           execute "DROP TABLE#{' IF EXISTS' if options[:if_exists]} #{quote_table_name(table_name)}#{' CASCADE' if options[:force] == :cascade}"
         end
 
@@ -376,6 +377,8 @@ def primary_keys(table_name) # :nodoc:
         #   rename_table('octopuses', 'octopi')
         def rename_table(table_name, new_name)
           clear_cache!
+          schema_cache.clear_data_source_cache!(table_name.to_s)
+          schema_cache.clear_data_source_cache!(new_name.to_s)
           execute "ALTER TABLE #{quote_table_name(table_name)} RENAME TO #{quote_table_name(new_name)}"
           pk, seq = pk_and_sequence_for(new_name)
           if pk

activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb

@@ -218,6 +218,8 @@ def remove_index(table_name, options = {}) #:nodoc:
       # Example:
       #   rename_table('octopuses', 'octopi')
       def rename_table(table_name, new_name)
+        schema_cache.clear_data_source_cache!(table_name.to_s)
+        schema_cache.clear_data_source_cache!(new_name.to_s)
         exec_query "ALTER TABLE #{quote_table_name(table_name)} RENAME TO #{quote_table_name(new_name)}"
         rename_table_indexes(table_name, new_name)
       end

activerecord/test/cases/migration_test.rb

@@ -190,6 +190,7 @@ def test_add_table_with_decimals
 
     assert_not_predicate BigNumber, :table_exists?
     GiveMeBigNumbers.up
+    assert_predicate BigNumber, :table_exists?
     BigNumber.reset_column_information
 
     assert BigNumber.create(
@@ -482,6 +483,7 @@ def test_rename_table_with_prefix_and_suffix
     Thing.reset_table_name
     Thing.reset_sequence_name
     WeNeedThings.up
+    assert_predicate Thing, :table_exists?
     Thing.reset_column_information
 
     assert Thing.create("content" => "hello world")
@@ -502,8 +504,9 @@ def test_add_drop_table_with_prefix_and_suffix
     ActiveRecord::Base.table_name_suffix = "_suffix"
     Reminder.reset_table_name
     Reminder.reset_sequence_name
-    Reminder.reset_column_information
     WeNeedReminders.up
+    assert_predicate Reminder, :table_exists?
+    Reminder.reset_column_information
     assert Reminder.create("content" => "hello world", "remind_at" => Time.now)
     assert_equal "hello world", Reminder.first.content
 

activerecord/test/cases/migrator_test.rb

@@ -429,10 +429,10 @@ def test_migrator_db_has_no_schema_migrations_table
     _, migrator = migrator_class(3)
     migrator = migrator.new("valid")
 
-    ActiveRecord::Base.connection.drop_table "schema_migrations", if_exists: true
-    assert_not ActiveRecord::Base.connection.table_exists?("schema_migrations")
+    ActiveRecord::SchemaMigration.drop_table
+    assert_not_predicate ActiveRecord::SchemaMigration, :table_exists?
     migrator.migrate(1)
-    assert ActiveRecord::Base.connection.table_exists?("schema_migrations")
+    assert_predicate ActiveRecord::SchemaMigration, :table_exists?
   end
 
   def test_migrator_forward