Question

我有以下查询：

fooditems = Repo.all(from p in OrderItem, join: f in Food,
                                          on: p.food_id == f.id,
                                          where: p.inserted_at >= ^date_from and p.inserted_at <= ^date_to,
                                          group_by: f.name,
                                          select: %{name: f.name, quantity: sum(p.quantity)},
                                          order_by: [desc: f.category_id])

OrderItem表格有food_id列，而Food表格有name和category_id。我需要category_id表的Food排序结果。但是，查询似乎不起作用。它正在回归：

ERROR (grouping_error): column "f1.category_id" must appear in the GROUP BY clause or be used in an aggregate function

但是，我不想按类别对其进行分组，只是以同一个category_id中的项目一起显示的方式呈现它（order_by）。如何使查询按category_id列出项目？谢谢

Answer 1

根据@HarrisonLucas的建议，将我的查询更改为以下内容：

fooditems = Repo.all(from p in OrderItem, full_join: f in Food,
                                          on: p.food_id == f.id,
                                          where: p.inserted_at >= ^date_from and p.inserted_at <= ^date_to,
                                          group_by: f.name,
                                          group_by: f.category_id,
                                          select: %{name: f.name, quantity: sum(p.quantity)},
                                          order_by: [asc: f.category_id])

现在似乎有效。谢谢！

Elixir / Phoenix查询ERROR（grouping_error）

1 个答案: