Rails不等于current_user始终没有结果

Question

I am completely stumped. I'm trying to show objects that do not belong to the current user. Looks like this:

activities = Activity.where("user_id != ?", current_user.id)
@activities = activities.near(@user).all( :order => "start_date", :limit => 15)

But when I do this, no results are found, even though my database is full of objects where the user_id is NULL or someone else. The output looks fine as well to my rookie eyes. I can't figure out why nothing is getting pulled.

Output:

Activity Load (0.7ms)  SELECT activities.*, 3958.755864232 
* 2 * ASIN(SQRT(POWER(SIN((37.7749295 - activities.latitude) * PI() / 180 / 2), 2) + 
COS(37.7749295 * PI() / 180) * COS(activities.latitude * PI() / 180) * 
POWER(SIN((-122.4194155 - activities.longitude) * PI() / 180 / 2), 2))) AS distance, 
CAST(DEGREES(ATAN2( RADIANS(activities.longitude - -122.4194155), 
RADIANS(activities.latitude - 37.7749295))) + 360 AS decimal) % 360 AS bearing FROM 
"activities" WHERE (user_id != 34) AND (activities.latitude BETWEEN 37.4854659337783 AND 
38.0643930662217 AND activities.longitude BETWEEN -122.78562893449197 AND 
-122.05320206550803 AND 3958.755864232 * 2 * ASIN(SQRT(POWER(SIN((37.7749295 - 
activities.latitude) * PI() / 180 / 2), 2) + COS(37.7749295 * PI() / 180) * 
COS(activities.latitude * PI() / 180) * POWER(SIN((-122.4194155 - activities.longitude) * 
PI() / 180 / 2), 2))) <= 20) ORDER BY start_date, distance ASC LIMIT 15

If I try the query:

activities = Activity.where('user_id IS ?', nil)

I get the expected objects. Why do I get no results trying to not equal current_user.id?

Also, I've tried different permutations like where.not(user_id: current_user.id), <> ?, and a few others. And the results are the same.

UPDATED

I ended up making user_id's default value "1" rather than NULL. Once I did that, the code above worked fine. I guess my failing is not understanding the properties of nil(?)

Answer 1

Have you tried:

activities = Activity.where("user_id <> ?", current_user.id)

or (Rails 4)

activities = Activity.where.not(user_id: current_user.id)

And (Rails 3)

activities = Activity.where(Activity.arel_table[:user_id].not_eq(current_user.id)

... ish