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How to Add Custom Fields to CKAN 2.0
Note: This method works, but is surely not the most efficient method – it's just the only way I could get it to work. Edits from core CKAN contributors appreciated.
In order to add custom fields, you need to create and customize an extension. (Relax! This seems intimidating, but once it's installed, this is pretty easy.)
Generate setup.py file
SSH into your running CKAN instance as normal, e.g.
ssh -i your.pem ubuntu@XXX-XXX-XXX-XXX.compute-1.amazonaws.com
Change to your pyenv directory, e.g.
Activate pyenv, e.g.
Run this command to generate the setup wizard, replacing MYEXTENSION with what you'd like to name yours. Answer the questions as the wizard walks you through.
paster create -t ckanext ckanext-MYEXTENSION
This will create a new directory in the current directory named ckanext-MYEXTENSION. Change into this directory:
Open the setup.py file:
sudo nano setup.py
Copy its contents to a local file.
Put extension on Github
Create Github repo
Sign in to Github.com. Create a new repository.
Create local git repo
Create a new directory on your local machine, e.g.
Change into this directory:
Initiatilize a git repo:
Create a README file to get the repo going:
Add the README to the repo:
git add . git commit -am "First commit" git push
NOTE: If you already pushed an initial README to your Github repo and are blocked here, try:
git push --force
Create extension files
You can see an example of these files at: github.com/MarinaMartin/USMetadata and github.com/okfn/ckan/tree/release-v2.0/ckanext/example_idatasetform
In your MAIN (top-level) git repo directory on your local machine, e.g. ckanext-MYEXTENSION, create a file named “setup.py” and paste the contents of the setup.py generated earlier.
sudo nano setup.py
Also create a blank __init__.py file:
Now create a new directory called ckanext:
Switch to this directory:
Create a new __init__.py file containing the following:
try: import pkg_resources pkg_resources.declare_namespace(__name__) except ImportError: import pkgutil __path__ = pkgutil.extend_path(__path__, __name__)
Create a directory for your extension and change to it:
mkdir MYEXTENSION cd MYEXTENSION
Create a blank __init__.py and plugin.py file:
touch __init__.py touch plugin.py
Create a templates directory and change into it:
Create a package directory and change into it:
mkdir package cd package
Create a blank read.html file:
Create a snippets directory and change into it:
mkdir snippets cd snippets
Create two blank files:
touch package_basic_fields.html touch package_metadata_fields.html
Customize extension fields
Update the following files with the contents of github.com/MarinaMartin/USMetadata
ckanext/MYEXTENSION/plugin.py ckanext/MYEXTENSION/templates/package/read.html ckanext/MYEXTENSION/templates/package/snippets/package_basic_fields.html ckanext/MYEXTENSION/templates/package/snippets/package_metadata_fields.html
Customize these files for the needs of your custom fields.
Modify the setup.py file in your top-level directory. Under where it says Add Plugins here, uncomment and update:
[ckan.plugins] # Add plugins here, eg MYEXTENSION=ckanext.MYEXTENSION.plugin:YOURPLUGIN """
Replace MYEXTENSION with the exact same value as your MYEXTENSION directory name from above. Replace YOURPLUGIN with the name of the plugin class inside plugin.py, e.g.
Push changes to git
git add . git commit -am "Pushing extension" git push
Install on your CKAN server
Make sure you are SSHed into your CKAN environment for this step!
sudo pip install -e git+https://github.com/GITUSERNAME/TOPLEVELGITFOLDER#egg=MYEXTENSION
sudo pip install -e git+https://github.com/MarinaMartin/USMetadata#egg=usmetadata
Now edit your development.ini and add the extension to your list of plugins:
sudo nano development.ini ckan.plugins = MYEXTENSION
ckan.plugins = stats json_preview recline_preview datastore usmetadata
Restart your production server if needed:
sudo service apache2 restart
Now your custom fields should appear on your dataset packages!