关于 ruby?? on rails：未定义方法`_path

Undefined method `_path

我在创建名为"round"的新对象时遇到了一点问题。我收到以下错误：

NoMethodError in Rounds#new

undefined method `rounds_path'

rounds_controller.rb:

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def new
@round = Round.new
end

def create
@round = Round.new(round_params)
end

private

def round_params
params.require(round).permit(:tournament_id)
end

查看操作新：

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%h2 New round
= simple_form_for @round do |r|
= r.input :number, label: 'Round number'
= r.button :submit, class:"btn btn-primary"

Routes.rb:

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resources :tournaments do
resources :rounds
end

我认为问题在于嵌套，但我不知道具体在哪里。

Rails 猜测路线，这很有用。因为你只是绕过它路由到 rounds_path，所以你怀疑它是因为你已经嵌套了它。改变这个

1	= simple_form_for @round do \|r\|

到

1	= simple_form_for [@tournament, @round] do \|r\|

正如 Max 所说，您需要获得锦标赛。我假设您已经在控制器中使用 before_action 来完成此操作。然后我会亲自通过锦标赛创建回合

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class RoundsController

before_action :set_tournament

def new
@round = @tournament.rounds.new
end

def create
@round = @tournament.rounds.new(round_params)
end

private

def set_tournament
@tournament = Tournament.find(params[:tournament_id])
end

def round_params
params.require(:round).permit(:number)
end
end