PG :: UndefinedFunction: Fehler LIKE-Operator

Question

In meinem Rails-Projekt bekomme ich diesen Fehler, wenn ich versuche, Rating zu machen.

Fehler:

PG::UndefinedFunction: ERROR: operator does not exist: integer ~~ integer LINE 1: ...dbacks" WHERE "feedbacks"."user_id" = $1 AND (rating LIKE 5)^HINT: No operator matches the given name and argument type(s). You might need to add explicit type casts. : SELECT COUNT(*) FROM "feedbacks" WHERE "feedbacks"."user_id" = $1 AND (rating LIKE 5)

Controller-Code:

unless @user.feedbacks.count == 0 
    @rating = ((@user.feedbacks.where("rating LIKE 5").count*5 + @user.feedbacks.where("rating LIKE 4").count*4 + 
    @user.feedbacks.where("rating LIKE 3").count*3 + 
    @user.feedbacks.where("rating LIKE 2").count*2 
+@user.feedbacks.where("rating LIKE 1").count).to_f/@user.feedbacks.count).round(2) 
else 
    @rating = 0 
end 

Kann mir bitte jemand helfen?

Answer 1

The PostgreSQL documentation:

The LIKE expression returns true if the string matches the supplied pattern. (As expected, the NOT LIKE expression returns false if LIKE returns true, and vice versa. An equivalent expression is NOT (string LIKE pattern).)

Sie können nicht den LIKE Operator mit der ganzen Zahl verwenden. Bearbeiten Sie Ihre Abfrage. Etwas wie dieses:

"rating = 5"