如何将 ActiveModel 记录转储为 INSERT SQL 语句？

Question

之前在 Rails 6 中我一直在做：

    # I have an existing record
    record = MyRandomModel.take

    # Now I wanna get the INSERT SQL which would have been generated and executed on the DB in case it was a new record....

    model = record.class
    values = record.send(:attributes_with_values, record.send(:attributes_for_create, model.column_names))

    substitutes_and_binds = model.send(:_substitute_values, values)

    insert_manager = model.arel_table.create_insert
    insert_manager.insert substitutes_and_binds

    sql = model.connection.unprepared_statement do
      model.connection.to_sql(insert_manager)
    end

    puts sql
    #=> "INSERT...."

但是此过程在 Rails 7 中不起作用。它失败并出现以下错误：

NoMethodError: undefined method `_substitute_values' for MyRandomModel:Class

更新： 我已经走到这一步了：

  record = MyRandomModel.take
  model = record.class
  table = model.arel_table
  # Create an InsertManager object
  insert_manager = Arel::InsertManager.new(table)
  insert_manager.insert(
    record.send(:attributes_with_values, model.column_names).transform_keys { |name| table[name] }
  )
  insert_manager.to_sql

但是它会生成一个准备好的 INSERT 语句，但没有实际值...

Answer 1

好吧，我想我明白了：

  record = MyRandomModel.take
  model = record.class
  table = model.arel_table
  # Create an InsertManager object
  insert_manager = Arel::InsertManager.new(table)
  insert_manager.insert(
    record.send(:attributes_with_values, model.column_names).transform_keys { |name| table[name] }
  )
  model.connection.unprepared_statement do
    model.connection.to_sql(insert_manager)
  end