fix: cover_templates config double-encoded JSON causing 500 (#1363)
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This commit was merged in pull request #1363.
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@@ -10,8 +10,6 @@ Changes:
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3. config 为 JSON 字段,存储封面配置信息
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"""
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import json
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import sqlalchemy as sa
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from alembic import context, op
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@@ -73,7 +71,7 @@ def upgrade() -> None:
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name=name,
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thumbnail_url="",
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is_system=True,
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config=json.dumps(config),
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config=config,
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created_at=sa.func.now(),
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updated_at=sa.func.now(),
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)
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@@ -0,0 +1,39 @@
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"""修复 cover_templates.config 双重序列化
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Revision ID: 056_fix_cover_templates_config
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Revises: 055_cover_templates
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Create Date: 2026-08-13
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问题: 055 迁移 seed 数据时 json.dumps(config) 导致 config 被双重序列化为 JSON 字符串
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例如 "{}"(字符串)而不是 {}(对象),导致 Pydantic CoverTemplateResponse 校验失败 500。
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修复: 从 JSON 字符串中提取文本值,再 cast 回 json 对象类型。
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"""
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import sqlalchemy as sa
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from alembic import op
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revision = "056_fix_cover_templates_config"
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down_revision = "055_cover_templates"
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branch_labels = None
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depends_on = None
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def upgrade() -> None:
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conn = op.get_bind()
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# PostgreSQL: 从 JSON string scalar 中提取文本内容,cast 为 json object
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# 例如: JSON string "{}" -> text "{}" -> JSON object {}
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if conn.dialect.name == "postgresql":
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conn.execute(
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sa.text(
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"UPDATE cover_templates SET config = (config#>>'{}')::json "
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"WHERE jsonb_typeof(config::jsonb) = 'string'"
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)
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)
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def downgrade() -> None:
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# No safe rollback — the original data was incorrect
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pass
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