openstreetmap-website

https://github.com/openstreetmap/openstreetmap-website

Ruby

The Rails application that powers OpenStreetMap

ChangesetController#download

download the changeset as an osmChange document.

to make it easier to revert diffs it would be better if the osmChange
format were reversible, i.e: contained both old and new versions of
modified elements. but it doesn't at the moment...

this method cannot order the database changes fully (i.e: timestamp and
version number may be too coarse) so the resulting diff may not apply
to a different database. however since changesets are not atomic this
behaviour cannot be guaranteed anyway and is the result of a design
choice.

Source | Google | Stack overflow

Edit

git clone [email protected]:openstreetmap/openstreetmap-website.git

cd openstreetmap-website

open app/controllers/changeset_controller.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-ChangesetController-download-for-pr

# Commit to git

git add app/controllers/changeset_controller.rbgit commit -m "better docs for ChangesetController#download"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-ChangesetController-download-for-pr

hub pull-request

# Celebrate!