How to disable prepared statement in heroku with postgres database

Question

I fixed an issue on my rails project locally (with postgres config) while adding in database.yml this statement:

test:
  prepared_statements: false

Answer 1

We were worried about brittleness and maintaining consistency between staging/production (using DATABASE_URL on Heroku) and development/test (using database.yml/database.example.yml).

Inspired by Rails' tests, we put this in config/initializers/disable_prepared_statements.rb:

ActiveRecord::Base.establish_connection(
  ActiveRecord::Base.remove_connection.merge(
    :prepared_statements => false
  )
)

remove_connection returns a hash of the connection parameters of the connection being removed. This should let any database.yml or DATABASE_URL continue working.