superset 2018-08-01_11-47_7fcdcde0761c_ 源码
superset 2018-08-01_11-477fcdcde0761c 代码
文件路径：/superset/migrations/versions/2018-08-01_11-477fcdcde0761c.py
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"""Reduce position_json size by remove extra space and component id prefix
Revision ID: 7fcdcde0761c
Revises: c18bd4186f15
Create Date: 2018-08-01 11:47:02.233971
"""
# revision identifiers, used by Alembic.
import json
import re
import sqlalchemy as sa
from alembic import op
from sqlalchemy.ext.declarative import declarative_base
from superset import db
revision = "7fcdcde0761c"
down_revision = "c18bd4186f15"
Base = declarative_base()
class Dashboard(Base):
"""Declarative class to do query in upgrade"""
__tablename__ = "dashboards"
id = sa.Column(sa.Integer, primary_key=True)
dashboard_title = sa.Column(sa.String(500))
position_json = sa.Column(sa.Text)
def is_v2_dash(positions):
return (
isinstance(positions, dict) and positions.get("DASHBOARD_VERSION_KEY") == "v2"
)
def upgrade():
bind = op.get_bind()
session = db.Session(bind=bind)
dashboards = session.query(Dashboard).all()
for i, dashboard in enumerate(dashboards):
original_text = dashboard.position_json or ""
position_json = json.loads(original_text or "{}")
if is_v2_dash(position_json):
# re-dump the json data and remove leading and trailing white spaces
text = json.dumps(
position_json, indent=None, separators=(",", ":"), sort_keys=True
)
# remove DASHBOARD_ and _TYPE prefix/suffix in all the component ids
text = re.sub(r"DASHBOARD_(?!VERSION)", "", text)
text = text.replace("_TYPE", "")
dashboard.position_json = text
print(
"dash id:{} position_json size from {} to {}".format(
dashboard.id, len(original_text), len(text)
)
)
session.merge(dashboard)
session.commit()
def downgrade():
pass
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