PG-Promise

Question

我无法弄清楚如何利用 skip 跳过 undefined/null 值。我不断收到 Error: Property 'vehicle_id' doesn't exist。列集中的 skip 和 upsertReplaceQuery() 的 skip 是否相互冲突？我怎样才能让它工作？

const vehicleColumnSet = new pgp.helpers.ColumnSet(
  [
    { name: 'user_id' },
    {
      name: 'vehicle_id',
      skip: (c) => !c.exists,
    },
    { name: 'model_id', def: null },
  ],
  { table: 'vehicle' }
);

const upsertReplaceQuery = (data, columnSet, conflictField) => {
  return `${pgp.helpers.insert(
    data,
    columnSet
  )} ON CONFLICT(${conflictField}) DO UPDATE SET ${columnSet.assignColumns({
    from: 'EXCLUDED',
    skip: conflictField,
  })}`;
};

const vehicleUpsertQuery = upsertReplaceQuery(
  {
    user_id,
    model_id: vehicle_model,
  },
  vehicleColumnSet,
  'user_id'
);

await task.none(vehicleUpsertQuery);

Answer 1

PostgreSQL 在其多行插入语法中不支持任何 skip 逻辑。

And pg-promise documentation also tells you 内 skip 描述：

An override for skipping columns dynamically. Used by methods update (for a single object) and sets, ignored by methods insert and values. It is also ignored when conditional flag cnd is set.

最多，您可以针对单行插入添加这样的逻辑，as shown here。

PG-Promise - "Property doesn't exist" 跳过函数出错

PG-Promise - "Property doesn't exist" error with skip function