add infrastructure for clearing repository and running seeds

[elrayle]

This puts in place a series of classes that support generation of seed data.

Pattern

The pattern handles 3 scenarios. NOTE: all paths to files start from app/utils.

• clear existing repository metadata and data that is tightly coupled with the repository model (see data_maintenance.rb and files under data_destroyers)
• generate required repository objects (e.g. default collection types, default admin set) (see required_data_seeder.rb and files under required_data_seeders)
• generate repository metadata for release and development testing (see test_data_seeder.rb and files under test_data_seeders)

Benefits

Benefits of this approach:

• each scenario can be run together or separately
• allows applications to easily override the details of the seeding process using normal customization approaches
• establishes a pattern that applications can follow to create their own seed data
• provides an easy means of adding additional scenarios (e.g. current scenarios are for testing; a site can also have seeds that drive static production data, like collection types and collections)

To run:

NOTE: These examples show setting environment variables from the command line. They can be set in the regular way that an app sets environment variables. But since the running of seeds is generally not something you want to run all the time, it seems more like that setting the environment variables from the command line is a more common approach for seeds.

To list options without running anything...

$ bundle exec rails db:seed

To wipe data and generate required data...

$ bundle exec rails db:seed WIPE_DATA=true
####################################################################################

WARNING: You are about to clear all repository metadata from the datastore and solr.
Are you sure? [YES|n]
YES

To generate release data...

$ bundle exec rails db:seed SEED_RELEASE_TESTING=true

To run both...

$ bundle exec rails db:seed WIPE_AND_SEED_RELEASE_TESTING=true

Related Work

Issue #5351
PR #5056

@samvera/hyrax-code-reviewers

[dlpierce]

I like the approach and that it allows seed specs to be written.

Could the combined option be replaced with running bundle exec rails db:seed WIPE_DATA=true SEED_RELEASE_TESTING=true?