CODEWITHSUNDEEP
ruby-on-rails
Joe
Joe

Reputation: 379

How to pass data in rails from a controller to a view

I am trying to get data into my view from my controller in a rails app. I can instantiate the model in the view and it works. But when I try from the controller it fails. I can't seem to find nor figure out the technique. Can someone provide an example? The table is actually a view (on SQL server 2005) but I get the same results with a table.

Controller:

class ViewviewerimageController < ApplicationController

   def index

        @Viewviewerimage = Viewviewerimage.last

   end

end

Model:

class Viewviewerimage < ActiveRecord::Base

     self.table_name = "viewviewerimages"
     self.primary_key = 'ImageID'

end

View:

<!DOCTYPE HTML>

<html>
<head>

    <title>Image Data</title>

</head>
<body>

    <%= render template: "layouts/header" %>
    <%= render template: "layouts/sidebar" %>

    <div id="content">

    Table
    <% i = TblImage.first %>
    [obj] = <%= i %><br>
    ID = <%= i.DocumentNbr %><br>
    <br>
    View<br>
    <% the = Viewviewerimage.first %>
    [obj] = <%= the %><br>
    Size = <%= the.Size %><br>

    Fails (prints nothing)
    [obj] = <%= @Viewviewerimage %><br>
    <br>

    </div>

    <%= render template: "layouts/footer" %>

</body>
</html>

This is really holding me up so any assistance is appreciated.

Stackoverflow seems to prohibit me from editing my comment so I will post it here.

This is my view app\views\viewviewerimage\index.html.erb.

I tried to reference a member from the @Viewviewerimage and receive "NoMethodError in Viewviewerimage#index" which seems to match getting nothing. When I print [obj] = the I get a hex number which makes sense, it is an object.

[obj] = #<Viewviewerimage:0x620b3f8 >

I get nothing when I print @Viewviewerimage.

[obj] =

Also . . .

 <% the = @Viewviewerimage %>[obj] = <% the %> does the same thing as  [obj] = <% @Viewviewerimage %>

The answer is here: How to access data in rails from a view that was created in the controller?

I omitted several lines of code and one of them was causing the problem. I had a render :layout => false before the instance was being created. Apparently this does not work. Moving it to the end solved the issue.

Upvotes: 2

Views: 1178

Answers (1)

sourcx
sourcx

Reputation: 974

I think one of your biggest problems is naming things. A class called Viewviewerimage (view-viewer-image?) makes no sense. Also pay attention to CamelCasing and naming_your_files correctly.

When I try running your example code it seems to be working, so I guess you might have some confusing filenames here or there. When debugging your objects, you can always use .inspect to show them in the view. If you put <%= @Viewviewerimage.inspect %> in your view that corresponds to your controller you should see the model.

In your scenario make sure your controller goes into:

app/controllers/viewviewerimage_controller.rb

and that you have a route:

resources :viewviewerimage

I suggest renaming the lot at least to something like class ViewViewerImage, putting it in a file named view_viewer_image.rb, same goes for the controller.

Upvotes: 2

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