Hey everyone,
Coming from Rails I’d grown quite fond of flash messages. Unfortunately there isn’t a built in way of doing this in MVC4. Luckily, there’s a five minute solution posted on StackOverflow: http://stackoverflow.com/a/11809178/522859
Once implemented, it works just like in Rails:
this.Flash("We need you to login before you can edit anything.", FlashEnum.Warning);
Definitely worth checking out if you’ve got time, even more so if you’ve come over from Rails!
Hey everyone,
I’ve just added pagination (Kaminari) to make an infinite scroll list a little easier to use. Unfortunately, I ran into the following error – had me stumped for a while:
Missing partial /contents/content_list_item with {:locale=>[:en], :formats=>[:json], :handlers=>[:erb, :builder, :coffee]}. Searched in: * "/home/chris/funny/app/views" * "/home/chris/.rvm/gems/ruby-1.9.3-p327/gems/kaminari-0.14.1/app/views"
The solution was fairly simple, but adding a few things at once had me looking at it the wrong way. Because I was using the same nested partials for an HTML response as my JSON one, the file extensions weren’t what rails was expecting. To get around this, all I needed to do was fully qualify the partial filenames. For instance:
#The original
'/contents/content_list_item', :locals => { :@content_item => content} %>
#Became this
'/contents/content_list_item.html.erb', :locals => { :@content_item => content} %>
Hey everyone,
Another issue I came across while working with CarrierWave. After rebooting a VM Amazon started too complain “request time too skewed”:
This one is another simple fix, just make sure your system time is correct. I’d been using a VM and it had run forward by a few hours. Setting it back manually resolved the error.
Hey everyone,
After working with CarrierWave for a couple of days a few of my images started disappearing. It took a while to work out what was causing it, but thankfully the fix is pretty easy:
#Set fog_public in your initialiser to true config.fog_public = false #Should be config.fog_public = true
Alternatively, if you’d like them to keep expiring but want to adjust their availability you can use the following config option:
#Number of seconds config.fog_authenticated_url_expiration = 60000
There’s a bit of info in the following StackOverflow post: http://stackoverflow.com/a/13757841/522859
Hey everyone,
I’ve been mucking around with CarrierWave today and ran into a bit of an issue. When creating a thumbnail from an animated gif the thumbnail was also animated. Unfortunately this led to some of my image-heavy pages hanging for a bit.
This StackOverflow post offers the following solution:
#Add this method in your uploader
def remove_animation
manipulate! do |img, index|
index == 0 ? img : nil
end
end
#Adjust your thumbnail process so that it now includes a call to the new function
version :thumb do
process :remove_animation
process :resize_to_limit => [75, 75]
process :convert => 'jpg'
end
Hey everyone,
I was having a bit of trouble with CarrierWave on Amazon S3 today. When attempting to upload files that were larger than ~150kb I received one of the following errors (depending on config):
Despite the vague error, the solution was fairly simple. The region configured in my initialiser was different to the one my bucket was created in.
In order to find out which region you need, logon to your AWS console and browse to an uploaded image. Check the endpoint URL (properties > static website hosting) and simply copy the region. For examples:
Endpoint: testbucket123321.s3-website-us-west-2.amazonaws.com
Region: us-west-2
A couple of final tips if this doesn’t work for you:
Hey everyone,
Just a quick post on how to retrieve a remote JSON source so I don’t forget.
require 'open-uri'
require 'json'
#Retrieve source (controller/model)
@results = JSON.parse(open("http://www.myjsonsource.com/jsonfeed_num1").read)
#In view
That’s all there is to it, let me know if you have any problems!
Hey everyone,
Just a quick post on how to include a blank row or prompt value when using a select_tag in rails:
#Prompt "Please select an animal" /> #Blank option true />
Let me know if you have any issues.
Hey everyone,
This is just a quick guide on how to create a test/staging environment with Heroku.
-- Create staging environment heroku create --remote staging -- Push to staging app heroku push staging master -- Run rake db:migrate on staging app heroku run rake db:migrate --remote staging -- Add pgbackups add ons heroku addons:add pgbackups --remote staging heroku addons:add pgbackups --remote heroku -- Create backup of production data heroku pgbackups:capture --remote heroku -- Copy to staging environemnt heroku pgbackups:restore DATABASE `heroku pgbackups:url --remote heroku` --remote staging -- Create a new config file called staging.rb (/config/environments/staging.rb) -- Add environment variables heroku config:add RACK_EVN=staging RAILS_ENV=staging --remote staging -- Ready to go !
For those of you using git branches etc, the following may come in handy as well:
-- Create local development branch git branch development -- Switch to dev branch git checkout development -- Make your changes and commit them git init git add . git commit -m "My changes" -- Push to staging environment (local development branch to staging environment master branch) git push staging development:master
If you run into any trouble, I found the following links pretty helpful:
http://stackoverflow.com/a/6931462/522859
https://devcenter.heroku.com/articles/pgbackups#transfer
https://devcenter.heroku.com/articles/multiple-environments
Let me know if you’ve got anything to add.
Hey everyone,
I ran into the following error over the weekend while trying to push to heroku:
This stackoverflow post helped to solve the issue. All you need to do is add the following line to your application.rb file:
#Applicication.rb config.assets.initialize_on_precompile = false
Let me know if you have any problems.
What I Broke - Programming and Web Development 