Calling a method from a view using link_to_function

Question

I'm trying to have an image that when clicked associates the selected guideline to a project. I'm using link_to_function which somewhat behaves but I can not get the method I am calling in the link_to_function to redirect to another page. Is there a better way to do this? Below is a bit of my code. I can paste in additional parts if necessary:

<% @guidelines.each do |guideline| %>
 <tr>
    <td align='center'><%= link_to_function image_tag("../../../images/icons/action_add.png"), add_guideline(guideline)  %></td>
          <td><%=h guideline.title %></td>

My GuidelinesController.helper method looks like this:

  def add_guideline(guideline)
           @project = Project.find(params[:project_id])
           @project.guidelines << guideline
           @project.save   

           redirect_to dashboard_path #doesn't work :(
    end

maček · Accepted Answer · 2010-04-22 16:35:08Z

1

The Problem

link_to_function is for adding Javascript to your links.

in your code, add_guideline is being called and its result is being passed as the second argument to your link_to_function call.

EDIT

Checkout how to Add more RESTful actions

You can add this to config/routes.rb

# overwrite map.resources :projects
map.resources :projects, :member => {
  :add_guideline    => :get,
  :create_guideline => :post
}

This will add the following routes

   add_guideline_project GET    /projects/:id/add_guideline(.:format)
create_guideline_project POST   /projects/:id/create_guideline(.:format)

In your view, you can use

<%= link_to(
  image_tag("/images/icons/action_add.png"),
  add_guideline_project_path(@project)
) %>

This will link to `ProjectsController#add_guideline`.

Here you can do what you've been trying:

# app/controllers/projects_controller.rb
def add_guideline
  @project = Project.find(params[:id])

  # render app/views/projects/add_guideline.html.erb
  # create your form in this view
end

def create_guideline
  @project = Project.find(params[:project_id])
  @guideline = Guideline.find(params[:guideline_id])
  @project.guidelines << @guideline
  redirect_to dashboard_path
end

edited Apr 22, 2010 at 16:35

answered Apr 22, 2010 at 14:33

maček

78k37 gold badges172 silver badges200 bronze badges

Sign up to request clarification or add additional context in comments.

10 Comments

Jeff Over a year ago

I tried that previously. What happens then is that if I click on the link the url turns from: localhost:3000/projects/3/guidelines to localhost:3000/projects/3/guidelines# The guideline is also not added to the project :(

Jeff Over a year ago

actually what I get is: No route matches "/projects//guidelines/new" with {:method=>:get}

Jeff Over a year ago

If I specify the id I am able to redirect. However it goes to guidelines/new where I can create a new guideline, which is not what I want to do. I want to add an existing guideline to an existing project.

maček Over a year ago

@Jeff, I updated the link_to line in my post. Since you didn't paste them, I don't know what variables you have in your view, so I was sort of expecting you to cover your bases on that. We're you expecting to do this with Ajax or something?

Jeff Over a year ago

I suppose so. The flow is basically this: Navigate to projects/3. click button to Add Existing Guideline. See list of existing guidelines on a new page. Click add button to add one of the guidelines to project/3. Redirect back to project/3.

|

Reuben Mallaby · Accepted Answer · 2010-04-22 14:52:00Z

0

The helper is evaluated and result returned before the page is rendered... link_to_function uses JavaScript client-side after the page has been rendered.

Guessing from your code, you should probably have an action in your controller that take project_id and guideline_id to add a guideline to a project. Your link should then reflect this such as projects_add_guideline_path(project, guideline) with the contents of your helper in the new action.

In view:

link_to projects_add_guideline_path(@project, guideline)

In controller:

def add_guideline_to_project
  @project = Project.find(params[:project_id])
  @guideline = Guideline.find(params[:guideline_id])
  @project.guidelines << @guideline
  @project.save   
  redirect_to dashboard_path 
end

answered Apr 22, 2010 at 14:52

Reuben Mallaby

5,7574 gold badges51 silver badges47 bronze badges

3 Comments

Jeff Over a year ago

Where does projects_add_guideline_path come from?

Jeff Over a year ago

in other words: undefined method `projects_add_guideline_path' for #<ActionView::Base:0x1037508d8>

Reuben Mallaby Over a year ago

Sorry, it was an example...you'll need to define a route in config/routes.rb

Jeff · Accepted Answer · 2010-04-22 17:35:58Z

0

I got this working by using

<%= link_to(image_tag("/images/icons/action_add.png"), add_guideline_to_project_path(@project, :guideline_id => guideline.id))  %></td>
    <td><%=h guideline.title %></td>

and this method:

  def add_guideline_to
    @project = Project.find(params[:id])
    @guideline = Guideline.find(params[:guideline_id])
    @project.guidelines << @guideline
    @project.save

    redirect_to @project
  end

I also updated my routes to include:

map.resources :projects, :member => {
  :add_guideline    => :get,
  :create_guideline => :post
}

Thanks everyone!

answered Apr 22, 2010 at 17:35

Jeff

2,8383 gold badges29 silver badges31 bronze badges

Collectives™ on Stack Overflow

Calling a method from a view using link_to_function

3 Answers 3

The Problem

EDIT

Checkout how to Add more RESTful actions

This will add the following routes

In your view, you can use

This will link to `ProjectsController#add_guideline`.

10 Comments

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

The Problem

EDIT

Checkout how to Add more RESTful actions

This will add the following routes

In your view, you can use

This will link to ProjectsController#add_guideline.

10 Comments

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related

This will link to `ProjectsController#add_guideline`.