Ruby on rails Rails-路由错误-从另一个模型调用模型

问题：我的目标是在用户页面下列出项目，并在此用户页面上列出的每个项目下呈现注释框。但是，当我尝试呈现注释框表单时，会出现路由错误。我知道这是因为它无法提取项目的ID。我的猜测与控制器有关，但还没有弄清楚。有人知道我如何解决这个问题吗？

Routing Error
No route matches {:controller=>"comments", :format=>nil, :project_id=>#<Project id: nil...>}

project.rb

has_many :projects

has_many :comments
belongs_to :user

belongs_to :project

resources :users do
  resources :projects do
    resources :comments
  end
end

resources :projects do
  resources :comments 
end

resources: comments

<%= render @projects %>

<%= project.content %>
<%= render 'comments/form' %>

<%= form_for([@project, @project.comments.build]) do |f| %>
    <div class="field">
    <%= f.text_area :content, :class => "span12", :rows => "3" %>
    </div>

    <%= f.hidden_field :user_id, :value => current_user.id %>

    <div class="actions">
    <%= f.submit "Add Comment", :class => "btn btn-header" %>
    </div>
<% end %>

def create
  @project = Project.find(params[:project_id])
  @comment = @project.comments.create!(params[:comment])

  if @comment.save
    redirect_to projects_user_path(@project.user)
  end   
end

<%= project.content %>
<%= render 'comments/form', project: project %>

<%= form_for([project, project.comments.build]) do |f| %>
...

comment.rb

has_many :projects

has_many :comments
belongs_to :user

belongs_to :project

resources :users do
  resources :projects do
    resources :comments
  end
end

resources :projects do
  resources :comments 
end

resources: comments

<%= render @projects %>

<%= project.content %>
<%= render 'comments/form' %>

<%= form_for([@project, @project.comments.build]) do |f| %>
    <div class="field">
    <%= f.text_area :content, :class => "span12", :rows => "3" %>
    </div>

    <%= f.hidden_field :user_id, :value => current_user.id %>

    <div class="actions">
    <%= f.submit "Add Comment", :class => "btn btn-header" %>
    </div>
<% end %>

def create
  @project = Project.find(params[:project_id])
  @comment = @project.comments.create!(params[:comment])

  if @comment.save
    redirect_to projects_user_path(@project.user)
  end   
end

<%= project.content %>
<%= render 'comments/form', project: project %>

<%= form_for([project, project.comments.build]) do |f| %>
...

routes.rb

has_many :projects

has_many :comments
belongs_to :user

belongs_to :project

resources :users do
  resources :projects do
    resources :comments
  end
end

resources :projects do
  resources :comments 
end

resources: comments

<%= render @projects %>

<%= project.content %>
<%= render 'comments/form' %>

<%= form_for([@project, @project.comments.build]) do |f| %>
    <div class="field">
    <%= f.text_area :content, :class => "span12", :rows => "3" %>
    </div>

    <%= f.hidden_field :user_id, :value => current_user.id %>

    <div class="actions">
    <%= f.submit "Add Comment", :class => "btn btn-header" %>
    </div>
<% end %>

def create
  @project = Project.find(params[:project_id])
  @comment = @project.comments.create!(params[:comment])

  if @comment.save
    redirect_to projects_user_path(@project.user)
  end   
end

<%= project.content %>
<%= render 'comments/form', project: project %>

<%= form_for([project, project.comments.build]) do |f| %>
...

view/users/projects.html.erb

has_many :projects

has_many :comments
belongs_to :user

belongs_to :project

resources :users do
  resources :projects do
    resources :comments
  end
end

resources :projects do
  resources :comments 
end

resources: comments

<%= render @projects %>

<%= project.content %>
<%= render 'comments/form' %>

<%= form_for([@project, @project.comments.build]) do |f| %>
    <div class="field">
    <%= f.text_area :content, :class => "span12", :rows => "3" %>
    </div>

    <%= f.hidden_field :user_id, :value => current_user.id %>

    <div class="actions">
    <%= f.submit "Add Comment", :class => "btn btn-header" %>
    </div>
<% end %>

def create
  @project = Project.find(params[:project_id])
  @comment = @project.comments.create!(params[:comment])

  if @comment.save
    redirect_to projects_user_path(@project.user)
  end   
end

<%= project.content %>
<%= render 'comments/form', project: project %>

<%= form_for([project, project.comments.build]) do |f| %>
...

上面的重定向错误

NoMethodError in CommentsController#create
undefined method `user'

试试这个：

查看/projects/_project.html.erb

has_many :projects

has_many :comments
belongs_to :user

belongs_to :project

resources :users do
  resources :projects do
    resources :comments
  end
end

resources :projects do
  resources :comments 
end

resources: comments

<%= render @projects %>

<%= project.content %>
<%= render 'comments/form' %>

<%= form_for([@project, @project.comments.build]) do |f| %>
    <div class="field">
    <%= f.text_area :content, :class => "span12", :rows => "3" %>
    </div>

    <%= f.hidden_field :user_id, :value => current_user.id %>

    <div class="actions">
    <%= f.submit "Add Comment", :class => "btn btn-header" %>
    </div>
<% end %>

def create
  @project = Project.find(params[:project_id])
  @comment = @project.comments.create!(params[:comment])

  if @comment.save
    redirect_to projects_user_path(@project.user)
  end   
end

<%= project.content %>
<%= render 'comments/form', project: project %>

<%= form_for([project, project.comments.build]) do |f| %>
...

查看/comments/_form.html.erb

has_many :projects

has_many :comments
belongs_to :user

belongs_to :project

resources :users do
  resources :projects do
    resources :comments
  end
end

resources :projects do
  resources :comments 
end

resources: comments

<%= render @projects %>

<%= project.content %>
<%= render 'comments/form' %>

<%= form_for([@project, @project.comments.build]) do |f| %>
    <div class="field">
    <%= f.text_area :content, :class => "span12", :rows => "3" %>
    </div>

    <%= f.hidden_field :user_id, :value => current_user.id %>

    <div class="actions">
    <%= f.submit "Add Comment", :class => "btn btn-header" %>
    </div>
<% end %>

def create
  @project = Project.find(params[:project_id])
  @comment = @project.comments.create!(params[:comment])

  if @comment.save
    redirect_to projects_user_path(@project.user)
  end   
end

<%= project.content %>
<%= render 'comments/form', project: project %>

<%= form_for([project, project.comments.build]) do |f| %>
...

...

你必须通过该项目才能形成分部

---

希望这有帮助

您的关联中存在错误。是

属于\u：用户

和

属于\u项目

的单数形式。谢谢。固定的。路由错误仍然存在。好的，现在它会发布到我的数据库，但是当我尝试在comments controller中将重定向设置为@comment.project时，我得到了一个NoMethodError。既然评论属于项目，为什么我不能将此重定向到？我编辑了上面的问题，显示：“重定向到项目用户路径（@project.user）”已添加到上面问题的底部。错误似乎出现在

user.find（params[：user\u id]）

中。检查服务器日志中的参数。这是因为

params[：project\u id]

为nil，

@project

为nil，

user

不是nil类的方法。