Just a quick post on an error I ran into today while using hidden fields:
undefined method `merge' for 5:Fixnum 27:28: 'button' %> 29:30: 31: 32:
Thankfully this is an easy fix, simply amend your code as follows:
'button' %>@upload.product_id %>
And that’s all there is to it, let me know if there are any issues.
Just a quick post on another problem I ran into while setting up PaperClip. When attempting to submit a form WITHOUT an image I received the following error message:
Assets asset /tmp/stream20120218-22611-dgnkr-0.exe is not recognized by the 'identify' command.
Apparently the most common cause of this issue is one of two things:
#1: You don’t have RMagick installed
The easiest fix for this is to simply install the rmagick gem. Simply add rmagick to your Gemfile and run bundle install. Restart your server and you should be ready to go.
#2: Your command_path isn’t set correctly
Run the following command from your console:
chris@chris-VirtualBox:~/site$ which identify /usr/bin/identify
Then add the path that is returned to your environment settings:
Paperclip.options[:command_path] = "/usr/bin"
#3: If all else fails
If none of the above seem to be causing your issue, try adding the following to your model:
def asset?
!(asset_content_type =~ /^image.*/).nil?
end
This will simply prevent the file being processed if it’s not an image, avoiding the issue all together. Hopefully this’ll help someone out, let me know if you come across any other solutions.
UPDATE:
Apparently a more recent cause of this issue is an update to the cocaine gem, rolling back to version 0.3.2 appears to resolve the issue. Thanks to Ahmed and Fabrice for bringing it to my attention:
https://github.com/thoughtbot/paperclip/issues/1038
http://stackoverflow.com/a/12760881/522859
I finally decided to replace all my existing code to handle images with Paperclip. I was following the screencast by Emerson Lackey, #134 Paperclip, however I ran into a couple of issues. Thankfully they were all very easily fixed, and probably wouldn’t have occurred at all if I’d simply watched the whole screencast instead of trying to rush on ahead.
Issue #1:
The first issue I encountered was that my asset fields weren’t appearing on the page:
I spent way too much time trying to work this one out, especially considering how obvious the solution is – the screencast is simply missing an “=” after the initial “<%" in "<% f.fields_for". Simply amend it as follows:
Issue #2:
The second one is actually encountered and addressed by Emerson himself. Unfortunately I started trying to find a solution before seeing his, so just in case someone else does a Google search I’ll include the issue here:
undefined method `symbolize_keys!' for "/system/assets/1/original/mack_truck.jpg?1329550205":String
The problem here is simply that the parenthesis are in the wrong place, simply amend your code as follows:
Anyway, hopefully this helps someone else out – let me know if there are any issues.
Update: Don’t name your model assets!
Unfortunately I followed the tutorials naming example and called my model Asset. While this may have been fine in earlier version of rails it causes quirky conflicts with the asset pipeline. I strongly encourage you to use a different name i.e. Uploads
My goal for today was to populate a record with all of the Australian postcodes and their corresponding suburb and state descriptions. To do this I had to complete the following:
Step #1: Download the .csv
I came across the following files after browsing a few of the Australian tech forums. I chose to use the Corra ones due to the claim that there are no license restrictions.
Once you’ve chosen your .csv, just save it in your project folder i.e. C:my_app
Step #2: Create a Model for your Locations
Secondly, you’ll need to create a new migration for your locations. I’ve simply called mine Code:
def change
create_table :codes do |t|
t.string "Pcode"
t.string "Locality"
t.string "State"
t.string "Comments"
t.string "DeliveryOffice"
t.string "PresortIndicator"
t.string "ParcelZone"
t.string "BSPnumber"
t.string "BSPname"
t.string "Category"
t.timestamps
end
end
Step #3: Create a Script to Import the .csv
The third step is to create a script that allows you to import the csv. This is made simple thanks to a comment left by “Gianluca” on the following blog post:
http://erikonrails.snowedin.net/?p=212
Simply create a new file within your tasks folder and add the following code:
#my_app/lib/tasks/import.rake
require "csv"
desc "Import CSV file into an Active Record table"
task :csv_model_import, [:filename, :model] => :environment do |task,args|
firstline=0
keys = {}
CSV.foreach(args[:filename]) do |row|
if (firstline==0)
keys = row
firstline=1
next
end
params = {}
keys.each_with_index do |key,i|
params[key] = row[i]
end
Module.const_get(args[:model]).create(params)
end
end
Step #4: Run the script in order to populate the database
To run the script simply run the following command:
chris@chris-VirtualBox:~/my_app$ rake csv_model_import[codes.csv,Code]
Step #5: Cleanse the data
Cleansing the data is a little tedious, however one tip is to remove all locations that do not have a category value of “Delivery Area”.
Ahwell, that’s all I’ve got for now – let me know if you have any trouble.
This is just a quick post on how to connect to particular database via the console in PostGreSQL. First, make sure you’ve logged in – just swap my_app for your role name:
chris@chris-VirtualBox:~/site$ psql postgres my_app Password for user site: psql (8.4.10) Type "help" for help.
Finally, all you have to do to connect is the following:
postgres=> c my_app_development psql (8.4.10) You are now connected to database "my_app_development". my_app =>
If you’re having trouble working out what database name you’re trying to connect to you can view a list of all the current database with the following command:
my_app => l
List of databases
Name | Owner | Encoding | Collation | Ctype | Access privileges
------------------+----------+----------+-------------+-------------+-----------------------
postgres | postgres | UTF8 | en_AU.UTF-8 | en_AU.UTF-8 |
my_app_development | site | UTF8 | en_AU.UTF-8 | en_AU.UTF-8 |
my_app_production | site | UTF8 | en_AU.UTF-8 | en_AU.UTF-8 |
my_app_test | site | UTF8 | en_AU.UTF-8 | en_AU.UTF-8 |
template0 | postgres | UTF8 | en_AU.UTF-8 | en_AU.UTF-8 |
my_app => q -- q to exit database list
Just a quick post on how to stop an app on Heroku:
root@chris-VirtualBox:~/site# heroku maintenance:on Maintenance mode enabled.
This will display a static page to all visitors but still allows for migrations etc:
To re-enable the app simply use the following:
root@chris-VirtualBox:~/site# heroku maintenance:off Maintenance mode disabled.
I ran into a bit of trouble uploading an app to heroku for the first time, I was unable to authenticate.
root@chris-VirtualBox:~/site# git push heroku master Permission denied (publickey). fatal: The remote end hung up unexpectedly
This turned out to be an issue with my public key, in order to fix it simply create a new one:
root@chris-VirtualBox:~/site# ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/root/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: ...
Re-upload it:
root@chris-VirtualBox:~/site# heroku keys:add /root/.ssh/id_rsa.pub Uploading ssh public key /root/.ssh/id_rsa.pub
And finally re-push everything:
root@chris-VirtualBox:~/site# git push heroku master Enter passphrase for key '/root/.ssh/id_rsa': Counting objects: 579, done. Compressing objects: 100% (513/513), done. Writing objects: 100% (579/579), 6.09 MiB | 83 KiB/s, done. Total 579 (delta 101), reused 0 (delta 0) -----> Heroku receiving push -----> Ruby/Rails app detected
This Heroku page actually provides quite a bit of info if you’re still having problems: http://devcenter.heroku.com/articles/rails3
I ran into a bit of problem moving an app to a test Heroku host – I needed to install PostgreSQL. I added the following to my Gemfile:
#Gemfile #gem 'sqlite3' gem 'pg'
I then tried to run bundle install:
root@chris-VirtualBox:~/site# bundle install
However I received the following error:
root@chris-VirtualBox:~/site# bundle install
Fetching source index for http://rubygems.org/
Using rake (0.9.2)
Using multi_json (1.0.3)
Using activesupport (3.1.1)
Using builder (3.0.0)
Using i18n (0.6.0)
Using activemodel (3.1.1)
Using erubis (2.7.0)
Using rack (1.3.4)
Using rack-cache (1.1)
Using rack-mount (0.8.3)
Using rack-test (0.6.1)
Using hike (1.2.1)
Using tilt (1.3.3)
Using sprockets (2.0.2)
Using actionpack (3.1.1)
Using mime-types (1.16)
Using polyglot (0.3.2)
Using treetop (1.4.10)
Using mail (2.3.0)
Using actionmailer (3.1.1)
Using arel (2.2.1)
Using tzinfo (0.3.30)
Using activerecord (3.1.1)
Using activeresource (3.1.1)
Using bundler (1.0.21)
Using rack-ssl (1.3.2)
Using json (1.6.1)
Using rdoc (3.10)
Using thor (0.14.6)
Using railties (3.1.1)
Using rails (3.1.1)
Using acts-as-taggable-on (2.1.1)
Using awesome_nested_set (2.0.2)
Using bcrypt-ruby (3.0.1)
Using carrierwave (0.5.7)
Using cocaine (0.2.0)
Using coffee-script-source (1.1.2)
Using execjs (1.2.9)
Using coffee-script (2.2.0)
Using coffee-rails (3.1.1)
Using orm_adapter (0.0.5)
Using warden (1.0.6)
Using devise (1.4.8)
Using escape (0.0.4)
Using geocoder (1.0.5) from git://github.com/alexreisner/geocoder.git (at no_grouping)
Using jquery-rails (1.0.16)
Using libv8 (3.3.10.2)
Using nokogiri (1.5.0)
Using paperclip (2.4.5)
Installing pg (0.12.2) with native extensions
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/usr/bin/ruby1.8 extconf.rb
checking for pg_config... no
No pg_config... trying anyway. If building fails, please try again with
--with-pg-config=/path/to/pg_config
checking for libpq-fe.h... no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.
Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/usr/bin/ruby1.8
--with-pg
--without-pg
--with-pg-dir
--without-pg-dir
--with-pg-include
--without-pg-include=${pg-dir}/include
--with-pg-lib
--without-pg-lib=${pg-dir}/lib
--with-pg-config
--without-pg-config
--with-pg_config
--without-pg_config
Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/pg-0.12.2 for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/pg-0.12.2/ext/gem_make.out
An error occured while installing pg (0.12.2), and Bundler cannot continue.
Make sure that `gem install pg -v '0.12.2'` succeeds before bundling.
It turned out that because I was on Ubuntu I needed to install the libpq-dev package:
root@chris-VirtualBox:~/site# apt-get install libpq-dev Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: linux-headers-2.6.38-8 linux-headers-2.6.38-8-generic Use 'apt-get autoremove' to remove them. The following extra packages will be installed: comerr-dev krb5-multidev libgssapi-krb5-2 libgssrpc4 libk5crypto3 libkadm5clnt-mit7 libkadm5srv-mit7 libkdb5-4 libkrb5-3 libkrb5-dev libkrb5support0 libpq5 libssl-dev Suggested packages: krb5-doc krb5-user postgresql-doc-8.4 The following NEW packages will be installed: comerr-dev krb5-multidev libgssrpc4 libkadm5clnt-mit7 libkadm5srv-mit7 libkdb5-4 libkrb5-dev libpq-dev libpq5 libssl-dev The following packages will be upgraded: libgssapi-krb5-2 libk5crypto3 libkrb5-3 libkrb5support0 4 upgraded, 10 newly installed, 0 to remove and 106 not upgraded. Need to get 3,142 kB of archives. After this operation, 8,520 kB of additional disk space will be used. Do you want to continue [Y/n]? y Get:1 http://au.archive.ubuntu.com/ubuntu/ natty-updates/main libk5crypto3 i386 1.8.3+dfsg-5ubuntu2.2 [76.7 kB] Get:2 http://au.archive.ubuntu.com/ubuntu/ natty-updates/main libgssapi-krb5-2 i386 1.8.3+dfsg-5ubuntu2.2 [100 kB] Get:3 http://au.archive.ubuntu.com/ubuntu/ natty-updates/main libkrb5-3 i386 1.8.3+dfsg-5ubuntu2.2 [327 kB] Get:4 http://au.archive.ubuntu.com/ubuntu/ natty-updates/main libkrb5support0 i386 1.8.3+dfsg-5ubuntu2.2 [22.2 kB] Get:5 http://au.archive.ubuntu.com/ubuntu/ natty-updates/main libgssrpc4 i386 1.8.3+dfsg-5ubuntu2.2 [54.6 kB] Get:6 http://au.archive.ubuntu.com/ubuntu/ natty-updates/main libkadm5clnt-mit7 i386 1.8.3+dfsg-5ubuntu2.2 [38.7 kB] Get:7 http://au.archive.ubuntu.com/ubuntu/ natty-updates/main libkdb5-4 i386 1.8.3+dfsg-5ubuntu2.2 [38.1 kB] Get:8 http://au.archive.ubuntu.com/ubuntu/ natty-updates/main libkadm5srv-mit7 i386 1.8.3+dfsg-5ubuntu2.2 [51.6 kB] Get:9 http://au.archive.ubuntu.com/ubuntu/ natty/main comerr-dev i386 2.1-1.41.14-1ubuntu3 [41.5 kB] Get:10 http://au.archive.ubuntu.com/ubuntu/ natty-updates/main krb5-multidev i386 1.8.3+dfsg-5ubuntu2.2 [82.5 kB] Get:11 http://au.archive.ubuntu.com/ubuntu/ natty-updates/main libpq5 i386 8.4.10-0ubuntu0.11.04.1 [81.6 kB] Get:12 http://au.archive.ubuntu.com/ubuntu/ natty/main libssl-dev i386 0.9.8o-5ubuntu1 [2,019 kB] Get:13 http://au.archive.ubuntu.com/ubuntu/ natty-updates/main libkrb5-dev i386 1.8.3+dfsg-5ubuntu2.2 [15.0 kB] Get:14 http://au.archive.ubuntu.com/ubuntu/ natty-updates/main libpq-dev i386 8.4.10-0ubuntu0.11.04.1 [193 kB] Fetched 3,142 kB in 6s (506 kB/s) (Reading database ... 167506 files and directories currently installed.) Preparing to replace libk5crypto3 1.8.3+dfsg-5ubuntu2.1 (using .../libk5crypto3_1.8.3+dfsg-5ubuntu2.2_i386.deb) ... Unpacking replacement libk5crypto3 ... Preparing to replace libgssapi-krb5-2 1.8.3+dfsg-5ubuntu2.1 (using .../libgssapi-krb5-2_1.8.3+dfsg-5ubuntu2.2_i386.deb) ... Unpacking replacement libgssapi-krb5-2 ... Preparing to replace libkrb5-3 1.8.3+dfsg-5ubuntu2.1 (using .../libkrb5-3_1.8.3+dfsg-5ubuntu2.2_i386.deb) ... Unpacking replacement libkrb5-3 ... Preparing to replace libkrb5support0 1.8.3+dfsg-5ubuntu2.1 (using .../libkrb5support0_1.8.3+dfsg-5ubuntu2.2_i386.deb) ... Unpacking replacement libkrb5support0 ... Selecting previously deselected package libgssrpc4. Unpacking libgssrpc4 (from .../libgssrpc4_1.8.3+dfsg-5ubuntu2.2_i386.deb) ... Selecting previously deselected package libkadm5clnt-mit7. Unpacking libkadm5clnt-mit7 (from .../libkadm5clnt-mit7_1.8.3+dfsg-5ubuntu2.2_i386.deb) ... Selecting previously deselected package libkdb5-4. Unpacking libkdb5-4 (from .../libkdb5-4_1.8.3+dfsg-5ubuntu2.2_i386.deb) ... Selecting previously deselected package libkadm5srv-mit7. Unpacking libkadm5srv-mit7 (from .../libkadm5srv-mit7_1.8.3+dfsg-5ubuntu2.2_i386.deb) ... Selecting previously deselected package comerr-dev. Unpacking comerr-dev (from .../comerr-dev_2.1-1.41.14-1ubuntu3_i386.deb) ... Selecting previously deselected package krb5-multidev. Unpacking krb5-multidev (from .../krb5-multidev_1.8.3+dfsg-5ubuntu2.2_i386.deb) ... Selecting previously deselected package libpq5. Unpacking libpq5 (from .../libpq5_8.4.10-0ubuntu0.11.04.1_i386.deb) ... Selecting previously deselected package libssl-dev. Unpacking libssl-dev (from .../libssl-dev_0.9.8o-5ubuntu1_i386.deb) ... Selecting previously deselected package libkrb5-dev. Unpacking libkrb5-dev (from .../libkrb5-dev_1.8.3+dfsg-5ubuntu2.2_i386.deb) ... Selecting previously deselected package libpq-dev. Unpacking libpq-dev (from .../libpq-dev_8.4.10-0ubuntu0.11.04.1_i386.deb) ... Processing triggers for man-db ... Processing triggers for doc-base ... Processing 1 added doc-base file(s)... Registering documents with scrollkeeper... Processing triggers for install-info ... Setting up libkrb5support0 (1.8.3+dfsg-5ubuntu2.2) ... Setting up libk5crypto3 (1.8.3+dfsg-5ubuntu2.2) ... Setting up libkrb5-3 (1.8.3+dfsg-5ubuntu2.2) ... Setting up libgssapi-krb5-2 (1.8.3+dfsg-5ubuntu2.2) ... Setting up libgssrpc4 (1.8.3+dfsg-5ubuntu2.2) ... Setting up libkadm5clnt-mit7 (1.8.3+dfsg-5ubuntu2.2) ... Setting up libkdb5-4 (1.8.3+dfsg-5ubuntu2.2) ... Setting up libkadm5srv-mit7 (1.8.3+dfsg-5ubuntu2.2) ... Setting up comerr-dev (2.1-1.41.14-1ubuntu3) ... Setting up krb5-multidev (1.8.3+dfsg-5ubuntu2.2) ... Setting up libpq5 (8.4.10-0ubuntu0.11.04.1) ... Setting up libssl-dev (0.9.8o-5ubuntu1) ... Setting up libkrb5-dev (1.8.3+dfsg-5ubuntu2.2) ... Setting up libpq-dev (8.4.10-0ubuntu0.11.04.1) ... Processing triggers for libc-bin ... ldconfig deferred processing now taking place root@chris-VirtualBox:~/site#
And then just run bundle install again:
root@chris-VirtualBox:~/site# bundle install
There’s some documentation on the gems wiki page: https://bitbucket.org/ged/ruby-pg/wiki/Home
Just another quick post – how to create a button which does not submit a form when it’s clicked:
'button', :onclick => 'alert('Button not Submitted - Hopefully!!!!'), :class => "my_class" %>
Let me know if you have any problems.
Just a quick post on the command to start the rails console:
chris@chris-VirtualBox:~/site$ rails console Loading development environment (Rails 3.1.1) irb(main):001:0>
Here’s the documentation, it provides a pretty good summary of all the commands you’re likely to need.
What I Broke - Programming and Web Development 