Restore compatibility with Rails 6.0.2

Author: dr-itz

lib/arjdbc/postgresql/adapter.rb

@@ -384,7 +384,11 @@ def exec_insert(sql, name = nil, binds = [], pk = nil, sequence_name = nil)
     end
 
     def execute_batch(statements, name = nil)
-      execute(combine_multi_statements(statements), name)
+      if statements.is_a? Array
+        execute(combine_multi_statements(statements), name)
+      else
+        execute(statements, name)
+      end
     end
 
     def explain(arel, binds = [])
@@ -444,8 +448,13 @@ def build_insert_sql(insert) # :nodoc:
       sql
     end
 
-    def build_truncate_statements(table_names)
-      ["TRUNCATE TABLE #{table_names.map(&method(:quote_table_name)).join(", ")}"]
+    def build_truncate_statements(*table_names)
+      ["TRUNCATE TABLE #{table_names.flatten.map(&method(:quote_table_name)).join(", ")}"]
+    end
+
+    def truncate(table_name, name = nil)
+      ActiveRecord::Base.clear_query_caches_for_current_thread if @query_cache_enabled
+      execute("TRUNCATE TABLE #{quote_table_name(table_name)}", name)
     end
 
     def all_schemas

lib/arjdbc/sqlite3/adapter.rb

@@ -327,6 +327,15 @@ def build_truncate_statement(table_name)
       "DELETE FROM #{quote_table_name(table_name)}"
     end
 
+    def build_truncate_statements(*table_names)
+      table_names.flatten.map { |table_name| build_truncate_statement table_name }
+    end
+
+    def truncate(table_name, name = nil)
+      ActiveRecord::Base.clear_query_caches_for_current_thread if @query_cache_enabled
+      execute(build_truncate_statement(table_name), name)
+    end
+
     def check_version
       if database_version < "3.8.0"
         raise "Your version of SQLite (#{database_version}) is too old. Active Record supports SQLite >= 3.8."