Create new model for dependencies

[JonoYang]

scancode-toolkit has a new model called DependentPackage, which models the dependencies detected for a Package from a package manifest. The DependentPackage data shows up in the scancode JSON results in the top-level Dependencies field. We should create a new model, DiscoveredDependency (or some other name) to represent this in scancode.io

[tdruez]

@JonoYang I remember you had committed a new model for the dependencies but we decided to postpone after the toolkit upgrade.
Could you start a new branch with this new model? This would be a good base for discussion.

[JonoYang]

@tdruez I started a new branch with the DiscoveredDependency model I had from earlier. The only change I made from my original commit is that I increased the size of the package_uid related fields to 1024.

[tdruez]

PR merged.
Thanks @JonoYang for the implementation 👍

[tdruez]

Actually getting an issue when applying the migrations on a production database.

web_1     | Running migrations:
web_1     |   Applying scanpipe.0022_rename_dependencies_discoveredpackage_dependencies_data_and_more... OK
web_1     | Traceback (most recent call last):
web_1     |   File "/app/./manage.py", line 6, in <module>
web_1     |     command_line()
web_1     |   File "/app/scancodeio/__init__.py", line 45, in command_line
web_1     |     execute_from_command_line(sys.argv)
web_1     |   File "/usr/local/lib/python3.9/site-packages/django/core/management/__init__.py", line 446, in execute_from_command_line
web_1     |     utility.execute()
web_1     |   File "/usr/local/lib/python3.9/site-packages/django/core/management/__init__.py", line 440, in execute
web_1     |     self.fetch_command(subcommand).run_from_argv(self.argv)
web_1     |   File "/usr/local/lib/python3.9/site-packages/django/core/management/base.py", line 402, in run_from_argv
web_1     |     self.execute(*args, **cmd_options)
web_1     |   File "/usr/local/lib/python3.9/site-packages/django/core/management/base.py", line 448, in execute
web_1     |     output = self.handle(*args, **options)
web_1     |   File "/usr/local/lib/python3.9/site-packages/django/core/management/base.py", line 96, in wrapped
web_1     |     res = handle_func(*args, **kwargs)
web_1     |   File "/usr/local/lib/python3.9/site-packages/django/core/management/commands/migrate.py", line 349, in handle
web_1     |     post_migrate_state = executor.migrate(
web_1     |   File "/usr/local/lib/python3.9/site-packages/django/db/migrations/executor.py", line 135, in migrate
web_1     |     state = self._migrate_all_forwards(
web_1     |   File "/usr/local/lib/python3.9/site-packages/django/db/migrations/executor.py", line 167, in _migrate_all_forwards
web_1     |     state = self.apply_migration(
web_1     |   File "/usr/local/lib/python3.9/site-packages/django/db/migrations/executor.py", line 252, in apply_migration
web_1     |     state = migration.apply(state, schema_editor)
web_1     |   File "/usr/local/lib/python3.9/site-packages/django/db/migrations/migration.py", line 130, in apply
web_1     |     operation.database_forwards(
web_1     |   File "/usr/local/lib/python3.9/site-packages/django/db/migrations/operations/special.py", line 193, in database_forwards
web_1     |     self.code(from_state.apps, schema_editor)
web_1     |   File "/app/scanpipe/migrations/0023_migrate_dependencies.py", line 33, in migrate_dependencies_to_discovereddependencies
web_1     |     DiscoveredDependency.objects.create(
web_1     |   File "/usr/local/lib/python3.9/site-packages/django/db/models/manager.py", line 85, in manager_method
web_1     |     return getattr(self.get_queryset(), name)(*args, **kwargs)
web_1     |   File "/usr/local/lib/python3.9/site-packages/django/db/models/query.py", line 669, in create
web_1     |     obj = self.model(**kwargs)
web_1     |   File "/usr/local/lib/python3.9/site-packages/django/db/models/base.py", line 585, in __init__
web_1     |     raise TypeError(
web_1     | TypeError: DiscoveredDependency() got unexpected keyword arguments: 'requirement'

[tdruez]

Migration issues fixed in #514

[JonoYang]

Closing this now that #486 and #514 has been merged.