title: Multiple Carrierwave mount_uploader on a single model
body: <p>I have a model called Recipe which has 2 images that use carrierwave, so in this model i have this to setup carrierwave</p>
  
  <pre><code>mount_uploader :author_photo, AuthorUploader
  mount_uploader :photo, PhotoUploader
  </code></pre>
  
  <p>I have also added multiple version to my images such as thumb, small, medium, large</p>
  
  <p>The problem is. say i have 2 images</p>
  
  <pre><code>Chocolate_Cake.jpg as the photo
  My_Photo.jpg as author_photo
  </code></pre>
  
  <p>When i go into console and load up my recipe and to recipe.to_json, I get both my images back from carrierwave but they are both showing the photo for the recipe, not the author photo.</p>
  
  <pre><code>     "recipe": [
      {
          "author_photo": {
              "url": "/uploads/recipe/photo/8/Chocolate_Cake.jpg",
              "thumb": {
                  "url": "/uploads/recipe/photo/8/thumb_Chocolate_Cake.jpg"
              },
              "small": {
                  "url": "/uploads/recipe/photo/8/small_Chocolate_Cake.jpg"
              },
              "medium": {
                  "url": "/uploads/recipe/photo/8/medium_Chocolate_Cake.jpg"
              },
              "large": {
                  "url": "/uploads/recipe/photo/8/large_Chocolate_Cake.jpg"
              }
          },
          "id": 8,
          "photo": {
              "url": "/uploads/recipe/photo/8/Chocolate_Cake.jpg",
              "thumb": {
                  "url": "/uploads/recipe/photo/8/thumb_Chocolate_Cake.jpg"
              },
              "small": {
                  "url": "/uploads/recipe/photo/8/small_Chocolate_Cake.jpg"
              },
              "medium": {
                  "url": "/uploads/recipe/photo/8/medium_Chocolate_Cake.jpg"
              },
              "large": {
                  "url": "/uploads/recipe/photo/8/large_Chocolate_Cake.jpg"
              }
          },
  </code></pre>
  
  <p>So for some reason my json response isnt showing my uploaders properly.</p>
  
  <p>If i was to type this in console, </p>
  
  <pre><code> recipe.photo
   recipe.author_photo
  </code></pre>
  
  <p>They come up with different image urls</p>