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53 lines
1.4 KiB
53 lines
1.4 KiB
"""Add comment excerpt
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Revision ID: b9d9ae4c2286
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Revises: b424479202f9
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Create Date: 2018-08-28 02:42:48.436246
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"""
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from alembic import op
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import sqlalchemy as sa
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from sqlalchemy.ext.declarative import declarative_base
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from tildes.lib.string import extract_text_from_html, truncate_string
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# revision identifiers, used by Alembic.
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revision = "b9d9ae4c2286"
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down_revision = "b424479202f9"
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branch_labels = None
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depends_on = None
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Base = declarative_base()
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# declare a minimal comments table here - we don't want the migration to be potentially
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# impacted by future changes to the model, so we shouldn't import the real one
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class Comment(Base):
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__tablename__ = "comments"
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comment_id = sa.Column(sa.Integer, primary_key=True)
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is_deleted = sa.Column(sa.Boolean)
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rendered_html = sa.Column(sa.Text)
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excerpt = sa.Column(sa.Text)
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def upgrade():
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op.add_column(
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"comments", sa.Column("excerpt", sa.Text(), server_default="", nullable=False)
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)
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# generate excerpts for all existing (non-deleted) comments
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session = sa.orm.Session(bind=op.get_bind())
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comments = session.query(Comment).filter(Comment.is_deleted == False).all()
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for comment in comments:
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extracted_text = extract_text_from_html(comment.rendered_html)
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comment.excerpt = truncate_string(
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extracted_text, length=200, truncate_at_chars=" "
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)
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session.commit()
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def downgrade():
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op.drop_column("comments", "excerpt")
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