display random attachment (paperclip or sortable table?)

[hobo_hippy]

I have a model, let's call it foo, which has a paperclip photo
attachment. I know I can edit the foo card as such:

<%= image_tag @this.photo.url %>

which would render whatever photo attachment is associated with this
card. This is cool :)

However, I'd like to do something similar on the front page!

On my front-page within a <section>...</section> I'd like to dispay a
random image. that is to say, i'd like to make a call similiar to the
one above that chooses a random foo and displays that foo's image.


BTW: I'm tyring to work my way to building a site similar to
kittenwars.com. When I get it all working, I look forward to
submitting a recipe to the hobo cookbook! :p

Thanks,
HoboHippy

[hobo_hippy]

forgot to mention - I'm not sure whether I should be approaching this
with ruby code, hobo code (which would be awesome), via paperclip
somehow, or via sortable tables...

[kevinpfromnm]

the trick is getting the random foo.  perhaps grab with a limit 1, offset 0 - count?

everything else is straightforward dryml

[hobo_hippy]

If foo had a title field, i thought I could show it like this in the
front page index:

<view with="&@foo.title"/>

but that's not working... sorry I'm still learning ruby and such... i
know the & means execute this ruby code.

how could I approach this in dryml? I've been going through a lot of
tutorials and I'm not clear yet. Rememeber, I'm not including this on
any foo page, it's on the front-page.

Furthermore, becuase the photo is attached with

has_attached_file :photo

I have no idea how to access that since all the examples seem to show
how to access things declared within the fields_do section of a model
definition.

I have little to no idea what you mean when you say "grab with limit
1, offset 0 -count?"

:(

[kevinpfromnm]

For the code, you probably want a card.  Then define your card to include the picture.   Check this recipe for an example of how to display a paperclip image in a card.  http://cookbook-staging.hobocentral.net/recipes/46-using-lightbox-with-hobo

For the random selection I meant selecting the model with a find or scope, you want 1 item, :limit => 1, but a random selection from the whole collection, so :offset => some_random_number_between_0_and_the_max.  Once you have your item, you should be able to just add a card (after you adjust it to show the image) with that item as the context.

In the controller:
@image = ImageModelCount.find :first, :limit => 1, :offset => rand(ImageModelName.count)

There might be a cleaner way to do the offset without requiring the extra db hit with sql.

In the view:
<card with="&@image" />

[hobo_hippy]

THANK YOU!! Thats very clear and concise.

On Jul 6, 12:33 pm, kevinpfromnm <kevinpfro...@gmail.com> wrote:
> For the code, you probably want a card.  Then define your card to include
> the picture.   Check this recipe for an example of how to display a

> paperclip image in a card.  http://cookbook-staging.hobocentral.net/recipes/46-using-lightbox-wit...

[hobo_hippy]

I'M still Messing with this... haven't quite got it down.

I think my problem is with how I handled the controller. I followed
your above formulation, except I'm not sure what the imagemodelcount
comes from, or should be. I just stuck in the model name, which of
course yielded nothing good...

I should also mention I added that in the frontController, which I
thought made sense since that's the page I'm trying to get this to
work on...

[kevinpfromnm]

Doh.  It should just be the ImageModel name, don't know why I stuck Count on the end of that.

[hobo_hippy]

Kevin,

I've been reading and rereading the manual and going over your
recommendations above with no luck. I'm completely stuck and
confused!! please advise. I've included the setup I'm using in a dummy
site I'm messing with to figure this out. Personally, I'm convinced
it's that I'm doing something stupid in setting up the controller.

controller:
____________________________________________
class ThingsController < ApplicationController

hobo_model_controller

auto_actions :all

def show
@rando = Thing :first, :limit => 1, :offset =>
rand(Thing.count)
end

end


model:
____________________________________________

class Thing < ActiveRecord::Base

hobo_model # Don't put anything above this

fields do
name :string
body :text
timestamps
end


# --- Permissions --- #

def create_permitted?
acting_user.administrator?
end

def update_permitted?
acting_user.administrator?
end

def destroy_permitted?
acting_user.administrator?
end

def view_permitted?(field)
true
end

end


page defined in application.dryml
____________________________________________

<def tag="index-page" for="Thing">
<page merge title="#{ht
'things.index.title', :default=>['Things'] }">
<body: class="index-page thing" param/>

<content: param>
<header param="content-header">
<h2 param="heading">
<ht key="things.index.heading">
Things
</ht>
</h2>

<p param="count" if>
<ht key="things.collection.count" count="&this.size">
There <count prefix="are"/>
</ht>
</p>
</header>

<section param="content-body">
<a action="new" to="&model" param="new-link">
<ht key="things.actions.new">New Thing</ht>
</a>

<page-nav param="top-page-nav"/>

<collection param/>

<page-nav param="bottom-page-nav"/>


</section>

<section>
<card with="&@rando"/>
<view with="&@rando"/>
</section>

</content:>
</page>
</def>

[hobo_hippy]

in the <card with...> i simply get a blank section formatted to the
css for a card

in the <view with...> i get (Not Available) which makes me think the
controller action I wrote isn't correct, or I'm not accessing it right

[hobo_hippy]

controller correction:

___________________________________________
class ThingsController < ApplicationController
hobo_model_controller
auto_actions :all
def show

@rando = Thing.find :first, :limit => 1, :offset =>
rand(Thing.count)
end
end

and in the page i also tried

<card with="&@rando.name"/>
<view with="&@rando.name"/>

and got identical results

[hobo_hippy]

WOW! ok this whole controller thing just clicked. just had to stick
the @rando... inside the def index...end and voila! totally makes
sense too.

here's to baby steps and learning this bit by bit