Rails 4 Postgres查询错误

Question

Here is my code, error comes back with an error at or near WHERE

first_of_month = Date.current.beginning_of_month
last_of_month = Date.current.end_of_month
today = Date.current
query = quotes.where('close_date BETWEEN ? AND ? AND status_id = 8 WHERE quote_exp < ? ', first_of_month, last_of_month, today)

query.sum(:total)

Answer 1

Based on your explanatory comments, you could write the query like this:

query = query.where(<<-EOQ, first_of_month, last_of_month, today)
  close_date BETWEEN ? AND ?
  AND (quote_exp >= ? OR status_id = 8)
EOQ

That will give you: (1) everything from the month (2) that is either not expired or has status 8. Remember that A->B is also ~AvB .

Answer 2

Your 4th line should not contain the WHERE keyword. You should replace it with AND if your intent is to add the other criterion to the rest, like so:

query = quotes.where('close_date BETWEEN ? AND ? AND status_id = 8 AND quote_exp < ? ', first_of_month, last_of_month, today)

Answer 3

您可以通过这种方式更好地编写它。

query = quotes.where(close_date: first_of_month..last_of_month, status_id: 8).where('quote_exp < ?', today).sum(:total)