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# frozen_string_literal: true
# Sometimes data migration specs require adding invalid test data in order to test
# the migration (e.g. adding a row with null foreign key). Certain db migrations that
# add constraints (e.g. NOT NULL constraint) prevent invalid records from being added
# and data migration from being tested. For this reason, SchemaVersionFinder can be used
# to find and use schema prior to specified one.
#
# @example
# RSpec.describe CleanupThings, :migration, schema: MigrationHelpers::SchemaVersionFinder.migration_prior(AddNotNullConstraint) do ...
#
# SchemaVersionFinder returns schema version prior to the one specified, which allows to then add
# invalid records to the database, which in return allows to properly test data migration.
module MigrationHelpers
class SchemaVersionFinder
def self.migrations_paths
ActiveRecord::Migrator.migrations_paths
end
def self.migration_context
ActiveRecord::MigrationContext.new(migrations_paths, ActiveRecord::SchemaMigration)
end
def self.migrations
migration_context.migrations
end
def self.migration_prior(migration_klass)
migrations.each_cons(2) do |previous, migration|
break previous.version if migration.name == migration_klass.name
end
end
end
end
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