Rails 订购方法； 列名为：顺序

Question

I have a model Exercises and it has columns of:circuit and:order (among others). In a view, I am trying to order the Exercises first by:circuit and then by:order. When I use the following:

@schedule.exercises.order(:circuit).each do |exercise|

it works as expected. However, when I try to add the:order column:

@schedule.exercises.order(:circuit, :order).each do |exercise|

I get the following error:

SQLite3::SQLException: near "order": syntax error: SELECT "exercises".* FROM "exercises"  WHERE "exercises"."schedule_id" = 1 ORDER BY circuit, order

The same error also occurs when I pass the:order column alone:

@schedule.exercises.order(:order).each do |exercise|

SQLite3::SQLException: near "order": syntax error: SELECT "exercises".* FROM "exercises"  WHERE "exercises"."schedule_id" = 1 ORDER BY order

I'm assuming that this is because the column name (:order) is the same as the SQL method name ( order ). I'm wondering if there's any way around this other than changing my column heading?

Thanks, Stuart

Answer 1

Changing the column name is the only sensible option out of this. Change it to something like "position".

Answer 2

If you really want to try and do this you could write a find by sql query and escape the col name with back quotes like

ModelName.find_by_sql(SELECT * FROM ModelName ORDER BY '`order`')

But I would say you should just change the column name

Answer 3

I am also facing same issue, but specifying table name in order clause it works.

@schedule.exercises.order("exercises.circuit ASC, exercises.order ASC").each do |exercise|

Answer 4

Just use "reorder" instead of "order"