Ruby NoMethodError - undefined method `blah_url' for BlahController

Question

I am calling this js from a link: ``` function createNewTopLevelEntry(){ var user_id = $("#user").val(); var header = prompt("Enter the name"); $.ajax( '/users/' + user_id + '/entries', { data: { entry: { header: header, user: user_id } }, type: 'POST', cache: false, dataType: 'json', success: displayTopLevelEntries }); } ``` It hits this controller: ``` def create @entry = Entry.new(params[:entry]) respond_to do |format| if @entry.save format.html { redirect_to @entry, notice: 'Entry was successfully created.' } format.json { render json: @entry, status: :created, location: @entry } else format.html { render action: "new" } format.json { render json: @entry.errors, status: :unprocessable_entity } end end end ``` This is the response on the server: ``` Started POST "/users/1/entries" for 127.0.0.1 at 2013-03-25 21:50:36 -0700 Processing by EntriesController#create as JSON Parameters: {"entry"=>{"header"=>"Hi", "user"=>"1"}, "user_id"=>"1"} (0.1ms) begin transaction SQL (0.5ms) INSERT…

Accepted Answer

The entry_url is what it's asking you to redirect to when you say redirect_to @entry

You don't have an entries resource in the routes file. You do have one nested within user, but then you need to pass as well as the entry.

```
redirect_to [ @user, @entry ]
```

just saw your comment - if it's doing this on the JSON path similarly you need to have

```
location: [@user, @entry]
```

Basically anywhere you're asking rails to build a url for an entry you need to pass the entry's user in because you have entry nested within user in the routes and not as a standalone resource routing.

Adding an edit to respond to the comment because there's no formatting in comments:

Yes, this it will work to delete the location as it will no longer call the helper to build that location in the json, but I am presuming you want that. So try this to make the location work:

```
format.json { render json => { :entry => @entry, :status => created, :location => [@user, @entry] }}
```

from your comment... if that's not working then let's try calling the url helper directly

```
format.json { render json => { :entry => @entry, :status => created, :location => user_entry_url(@user, @entry) }}
```

Ruby NoMethodError - undefined method `blah_url' for BlahController

Solution

Problem