Question

我收到此错误

“错误的参数数量（给定0，预期为1）”

但是如果我在控制器或范围内运行pry我可以看到参数并且它们正在被传入。我已经到处搜索但是无法弄清楚为什么会发生这种情况。

控制器

def create
  if Conversation.between(params[:sender_id], params[:recipient_id]).present?
    @conversation = Conversation.between(params[:sender_id],
    params[:recipient_id]).first
  else
    @conversation = Conversation.create!(conversation_params)
  end
end

模型

scope :between, -> (sender_id, recipient_id) { where(sender_id: sender_id, recipient_id: recipient_id).or.where(sender_id: recipient_id, recipient_id: sender_id) }

就像我说的，如果我在任何一个地方撬开，我都能看到它们在那里并且它们被传入。也许它与我的范围有关？

Answer 1

您使用的是Rails 5吗？如果你是，我认为你错过了import sys, pygame pygame.init() width, height = 700, 700 screen = pygame.display.set_mode((width, height), pygame.RESIZABLE) clock = pygame.time.Clock() FPS = 120 x1 = 0 y1 = 0 xmb1 = False xmf1 = False ymb1 = False ymf1 = False squareh = 50 squarew = 50 squares = 3 BLACK = (0,0,0) WHITE = (255,255,255) while 1: for event in pygame.event.get(): if event.type == pygame.QUIT: pygame.display.quit() sys.exit() elif event.type == pygame.KEYDOWN: if event.key == pygame.K_LEFT: xmb1 = True if event.key == pygame.K_RIGHT: xmf1 = True if event.key == pygame.K_UP: ymb1 = True if event.key == pygame.K_DOWN: ymf1 = True elif event.type == pygame.KEYUP: if event.key == pygame.K_LEFT: xmb1 = False if event.key == pygame.K_RIGHT: xmf1 = False if event.key == pygame.K_UP: ymb1 = False if event.key == pygame.K_DOWN: ymf1 = False if x1 == 0: xmb1 = False if y1 == 0: ymb1 = False if x1 == width - squarew: xmfl = False if y1 == height - squareh: ymf1 == False if xmb1: x1 -= squares if xmf1: x1 += squares if ymb1: y1 -= squares if ymf1: y1 += squares screen.fill(BLACK) pygame.draw.rect(screen, WHITE, (x1, y1, squareh, squarew), 0) pygame.display.flip() clock.tick(FPS)的争论。如果您将范围更改为此类型，它应该可以正常工作。你的第二个where子句应该是or的参数。

or

official documentation显示如下：

scope :between, -> (sender_id, recipient_id) { where(sender_id: sender_id, recipient_id: recipient_id).or(where(sender_id: recipient_id, recipient_id: sender_id)) }

Answer 2

试试这个：

scope :between, ->(params) {where(sender_id: params[:sender_id], recipient_id: params[:recipient_id]).or.where(sender_id: params[:recipient_id], recipient_id: params[:sender_id])

然后你必须用：

来调用它

 Conversation.between( { sender_id: params[:sender_id], recipient_id: params[:recipient_id]).present?

未见范围通过参数

2 个答案: