237 lines
9.0 KiB
Python
237 lines
9.0 KiB
Python
"""Bulk CSV import: name resolution, all-or-nothing safety, and template truth.
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The behaviour under test is what makes a spreadsheet import usable by someone
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who does not have the database in front of them. In particular: a foreign key
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column accepts the NAME of the thing it points at. Requiring numeric ids means
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importing a file, reading back generated ids, and pasting them into the next
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file - a workflow nobody finishes.
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"""
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import pytest
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from shopdb.core.services.csvimport import (
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IMPORTABLE, ImportError_, Resolver, generate_template, import_csv,
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importable_columns, required_columns,
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)
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from shopdb.extensions import db as _db
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REFERENCE = [
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('assettypes', 'assettype,description\nMachine,Shop floor\nMeasuring Tool,Gage lab\n'),
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('assetstatuses', 'status,description\nActive,In service\nRetired,Out\n'),
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('locationtypes', 'locationtype\nBay\nRoom\n'),
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]
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def seed_reference(resolver):
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for table, text in REFERENCE:
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result = import_csv(table, text, resolver=resolver, commit=True)
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assert result.ok, [str(p) for p in result.problems]
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result = import_csv(
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'locations',
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'locationname,building,locationtypeid\nBay 3,Building 1,Bay\nGage Lab,Building 2,Room\n',
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resolver=resolver, commit=True)
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assert result.ok, [str(p) for p in result.problems]
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def count(table):
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return _db.session.execute(_db.text('select count(*) from %s' % table)).scalar()
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def test_foreign_keys_resolve_by_name(db):
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"""The headline behaviour: write 'Gage Lab', not locationid=2."""
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resolver = Resolver()
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seed_reference(resolver)
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result = import_csv(
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'assets',
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'assetnumber,name,assettypeid,statusid,locationid\n'
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'CMM-01,Zeiss,Measuring Tool,Active,Gage Lab\n',
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resolver=resolver, commit=True)
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assert result.ok, [str(p) for p in result.problems]
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row = _db.session.execute(_db.text(
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'select t.assettype, s.status, l.locationname from assets a '
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'join assettypes t on t.assettypeid = a.assettypeid '
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'join assetstatuses s on s.statusid = a.statusid '
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'join locations l on l.locationid = a.locationid')).fetchone()
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assert tuple(row) == ('Measuring Tool', 'Active', 'Gage Lab')
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def test_numeric_ids_still_work(db):
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"""Exports round-trip, and some sites genuinely know their ids."""
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resolver = Resolver()
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seed_reference(resolver)
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typeid = _db.session.execute(_db.text(
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"select assettypeid from assettypes where assettype = 'Machine'")).scalar()
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result = import_csv(
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'assets', 'assetnumber,assettypeid\nMILL-1,%d\n' % typeid,
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resolver=resolver, commit=True)
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assert result.ok, [str(p) for p in result.problems]
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assert count('assets') == 1
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def test_unknown_name_names_the_column_and_the_value(db):
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"""The error has to be actionable by someone holding a spreadsheet."""
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resolver = Resolver()
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seed_reference(resolver)
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result = import_csv(
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'assets',
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'assetnumber,assettypeid,locationid\nX-1,Machine,Bay 9\n',
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resolver=resolver, commit=False)
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assert not result.ok
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message = str(result.problems[0])
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assert "locationid" in message
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assert "Bay 9" in message
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assert "locations.csv" in message
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def test_reimport_updates_rather_than_duplicating(db):
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"""Sites correct their spreadsheet and run it again. That must not double up."""
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resolver = Resolver()
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seed_reference(resolver)
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text = 'assetnumber,name,assettypeid\nCMM-01,Zeiss,Machine\n'
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first = import_csv('assets', text, resolver=resolver, commit=True)
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assert (first.created, first.updated) == (1, 0)
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renamed = 'assetnumber,name,assettypeid\nCMM-01,Zeiss Contura,Machine\n'
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second = import_csv('assets', renamed, resolver=resolver, commit=True)
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assert (second.created, second.updated) == (0, 1)
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assert count('assets') == 1
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assert _db.session.execute(_db.text(
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"select name from assets where assetnumber = 'CMM-01'")).scalar() == 'Zeiss Contura'
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def test_one_bad_row_writes_nothing(db):
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"""A typo on the last line must not leave the earlier lines imported."""
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resolver = Resolver()
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seed_reference(resolver)
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result = import_csv(
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'assets',
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'assetnumber,assettypeid\n'
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'GOOD-1,Machine\n'
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'GOOD-2,Machine\n'
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'BAD-3,NoSuchType\n',
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resolver=resolver, commit=True)
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assert not result.ok
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assert count('assets') == 0, 'rows were written despite a failure'
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def test_unknown_column_is_rejected_with_the_accepted_list(db):
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"""The failure mode of a hand-written template: invented columns."""
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resolver = Resolver()
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seed_reference(resolver)
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result = import_csv(
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'vendors', 'vendor,zipcode\nDell,78682\n', resolver=resolver, commit=False)
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assert not result.ok
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message = str(result.problems[0])
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assert 'zipcode' in message
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assert 'this table accepts' in message
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def test_missing_required_column_is_rejected(db):
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result = import_csv('assets', 'name\nNo asset number\n', commit=False)
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assert not result.ok
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assert 'assetnumber' in str(result.problems[0])
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def test_booleans_take_1_and_0_and_reject_prose(db):
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resolver = Resolver()
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seed_reference(resolver)
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ok = import_csv('assets', 'assetnumber,assettypeid,isactive\nA-1,Machine,0\n',
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resolver=resolver, commit=True)
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assert ok.ok, [str(p) for p in ok.problems]
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bad = import_csv('assets', 'assetnumber,assettypeid,isactive\nA-2,Machine,maybe\n',
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resolver=resolver, commit=False)
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assert not bad.ok
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assert 'isactive' in str(bad.problems[0])
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def test_comment_and_blank_lines_are_ignored(db):
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"""The templates ship a commented example. Importing one unedited should be
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a no-op, not a row of literal placeholder text."""
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resolver = Resolver()
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seed_reference(resolver)
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result = import_csv(
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'assets',
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'# a comment\nassetnumber,assettypeid\n\n# <assetnumber>,<type>\nREAL-1,Machine\n',
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resolver=resolver, commit=True)
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assert result.ok, [str(p) for p in result.problems]
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assert result.created == 1
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def test_passwords_are_never_importable():
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"""A CSV carrying password hashes gets mailed around; one carrying plaintext
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is worse. Neither column may be set from a file."""
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for table in IMPORTABLE:
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names = {c.name for c in importable_columns(table)}
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assert 'passwordhash' not in names
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assert 'password' not in names
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def test_generated_templates_only_contain_real_columns(db):
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"""The regression that motivated all of this.
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A hand-written template set had invented columns on 7 of 11 tables and named
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a table that does not exist. Generating from the schema is what makes that
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impossible - so assert the generator actually does it.
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"""
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for table in IMPORTABLE:
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text = generate_template(table)
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header = [line for line in text.splitlines() if line and not line.startswith('#')][0]
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real = {c.name for c in importable_columns(table)}
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for column in header.split(','):
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assert column in real, '%s.csv offers a column that does not exist: %s' % (table, column)
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def test_every_template_includes_its_required_columns(db):
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"""A template that omits a required column produces a file that cannot import."""
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for table in IMPORTABLE:
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header = [line for line in generate_template(table).splitlines()
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if line and not line.startswith('#')][0].split(',')
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for column in required_columns(table):
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assert column in header, '%s.csv is missing required column %s' % (table, column)
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def test_importable_tables_all_exist(db):
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"""A registry entry naming a table that is not in the schema would fail only
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when someone tried to use it."""
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for table in IMPORTABLE:
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assert table in _db.metadata.tables, '%s is registered but not in the schema' % table
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def test_unimportable_table_is_refused(db):
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with pytest.raises(ImportError_):
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import_csv('auditlog', 'x\n1\n', commit=False)
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def test_dry_run_reports_counts_then_rolls_back(db):
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"""The number an operator needs before saying yes - and no trace afterwards.
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Writes go into the transaction even on a dry run, which is what lets a later
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file resolve names an earlier one created. The rollback is what makes it a
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dry run.
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"""
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resolver = Resolver()
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seed_reference(resolver)
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result = import_csv(
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'assets', 'assetnumber,assettypeid\nD-1,Machine\nD-2,Machine\n',
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resolver=resolver)
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assert result.ok
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assert result.created == 2
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_db.session.rollback()
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assert count('assets') == 0
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def test_a_dry_run_over_several_files_resolves_across_them(db):
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"""The whole-folder check: assets must resolve locations that only exist
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because an earlier file in the same run created them."""
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resolver = Resolver()
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seed_reference(resolver)
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result = import_csv(
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'assets',
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'assetnumber,assettypeid,locationid\nX-1,Machine,Bay 3\n',
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resolver=resolver)
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assert result.ok, [str(p) for p in result.problems]
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_db.session.rollback()
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assert count('assets') == 0
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