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73 lines
2.7 KiB
73 lines
2.7 KiB
# Generated by Jiangjie.Bai on 2020-12-01 10:47
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from django.db import migrations
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from django.db.models import Q
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default_node_value = 'Default' # Always
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old_default_node_key = '0' # Version <= 1.4.3
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new_default_node_key = '1' # Version >= 1.4.4
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def compute_parent_key(key):
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try:
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return key[:key.rindex(':')]
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except ValueError:
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return ''
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def migrate_default_node_key(apps, schema_editor):
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""" 将已经存在的Default节点的key从0修改为1 """
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# 1.4.3版本中Default节点的key为0
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print('')
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Node = apps.get_model('assets', 'Node')
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Asset = apps.get_model('assets', 'Asset')
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# key为0的节点
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old_default_node = Node.objects.filter(key=old_default_node_key, value=default_node_value).first()
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if not old_default_node:
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print(f'Check old default node `key={old_default_node_key} value={default_node_value}` not exists')
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return
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print(f'Check old default node `key={old_default_node_key} value={default_node_value}` exists')
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# key为1的节点
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new_default_node = Node.objects.filter(key=new_default_node_key, value=default_node_value).first()
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if new_default_node:
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print(f'Check new default node `key={new_default_node_key} value={default_node_value}` exists')
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all_assets = Asset.objects.filter(
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Q(nodes__key__startswith=f'{new_default_node_key}:') | Q(nodes__key=new_default_node_key)
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).distinct()
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if all_assets:
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print(f'Check new default node has assets (count: {len(all_assets)})')
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return
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all_children = Node.objects.filter(key__startswith=f'{new_default_node_key}:')
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if all_children:
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print(f'Check new default node has children nodes (count: {len(all_children)})')
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return
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print(f'Check new default node not has assets and children nodes, delete it.')
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new_default_node.delete()
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# 执行修改
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print(f'Modify old default node `key` from `{old_default_node_key}` to `{new_default_node_key}`')
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nodes = Node.objects.filter(
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Q(key__istartswith=f'{old_default_node_key}:') | Q(key=old_default_node_key)
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)
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for node in nodes:
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old_key = node.key
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key_list = old_key.split(':', maxsplit=1)
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key_list[0] = new_default_node_key
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new_key = ':'.join(key_list)
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node.key = new_key
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node.parent_key = compute_parent_key(node.key)
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# 批量更新
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print(f'Bulk update nodes `key` and `parent_key`, (count: {len(nodes)})')
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Node.objects.bulk_update(nodes, ['key', 'parent_key'])
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class Migration(migrations.Migration):
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dependencies = [
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('assets', '0062_auto_20201117_1938'),
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]
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operations = [
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migrations.RunPython(migrate_default_node_key)
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]
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