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37 lines
1.1 KiB
37 lines
1.1 KiB
10 years ago
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from django.db import connection
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import legacy
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from parlamentares.models import NivelInstrucao
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mappings = (
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(NivelInstrucao,
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'cod_nivel_instrucao',
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[('des_nivel_instrucao', 'nivel_instrucao')]),
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)
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def run_legacy_migration():
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for model, pk, field_pairs in mappings:
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# clear all model entries
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model.objects.all().delete()
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# resets id sequence
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sql_reset_seq = 'ALTER SEQUENCE %s_id_seq RESTART WITH 1;' % model._meta.db_table
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cursor = connection.cursor()
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cursor.execute(sql_reset_seq)
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legacy_model = getattr(legacy.models, model.__name__)
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for old in legacy_model.objects.all().order_by(pk):
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old_id = getattr(old, pk)
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new = model()
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while not new.id:
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for old_field, new_field in field_pairs:
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setattr(new, new_field, getattr(old, old_field))
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new.save()
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assert new.id <= old_id, 'New id exceeds old one. Be sure your new table was just created!'
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if new.id < old_id:
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new.delete()
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new = model()
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