How to configure heroku ci for rails app with postgis? - ruby-on-rails

Question

My rails 4 app uses postgis with the activerecord-postgis-adapter. I'm attempting to use Heroku CI. The ci run fails when it is loading the database structure when it reaches a geometry column description in the schema.rb file.
-----> Preparing test database
Running: rake db:schema:load_if_ruby
The PGconn, PGresult, and PGError constants are deprecated, and will be
removed as of version 1.0.
You should use PG::Connection, PG::Result, and PG::Error instead, respectively.
Called from /app/vendor/bundle/ruby/2.5.0/gems/activesupport-4.2.11.1/lib/active_support/dependencies.rb:240:in `load_dependency'
rake aborted!
NoMethodError: undefined method `geometry' for #<ActiveRecord::ConnectionAdapters::PostgreSQL::TableDefinition:0x000055bd614ea1a0>
/app/db/schema.rb:105:in `block (2 levels) in <top (required)>'
/app/vendor/bundle/ruby/2.5.0/gems/activerecord-4.2.11.1/lib/active_record/connection_adapters/abstract/schema_statements.rb:216:in `create_table'
...
My database.yml file specifies the postgis adapter for all environments, so I'm surprised to see it using the postgresql adapter.
Any suggestions?
I previously recorded the database schema in sql. I found a suggestion on the heroku site to switch to ruby. That didn't help.
The tests run fine locally.

Answer 1

I think this is just an issue with HerokuCI. A workaround is to overwrite the DATABASE_URL to specify postgis. Below are two different ways to accomplish that:
Add a .profile file (documented here) in your project root with the following contents:
export DATABASE_URL=`echo $DATABASE_URL | sed s/postgres/postgis/g`
OR Update the test command in your app.json:
{
"environments": {
"test": {
"scripts": {
"test": "export DATABASE_URL=`echo $DATABASE_URL | sed s/postgres/postgis/g`; <other test commands here>",
...
So, for example: if the DATABASE_URL was postgres://foo:bar#example:5432/my-app, that would update it to postgis://foo:bar#example:5432/my-app before any of the relevant commands are invoked.