Viewed k times. Using the rails 3 style how would I write the opposite of: Foo. I tried: Foo. You Nguyen 9, 3 3 gold badges 21 21 silver badges 49 49 bronze badges.
So the generated query is in fact what you asked for - this was not an ARel bug. Add a comment. Active Oldest Votes. The canonical way to do this with Rails 3: Foo. Adam Lassek Adam Lassek Last one here isn't working for me, do we need an extra gem or plugin for this?
Tim Yes, the MetaWhere gem I linked above. I like the solution that doesn't require other gems : even if it is a bit ugly — oreoshake. But of course a general case is good to know. Building the query isn't a performance concern; what you're requesting from the database is. Show 8 more comments. It's not a bug in ARel, it's a bug in your logic. What you want here is: Foo. Damien Damien If you want that, you'll have to do something like this: GroupUser.
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Viewed k times. I found this article which references this: Topic. Toby Joiner Toby Joiner 4, 7 7 gold badges 31 31 silver badges 47 47 bronze badges. Example: Person. Add a comment. Active Oldest Votes. This is the proper approach with the latest Active Record query model — Nevir.
NewAlexandria is right, so you'd have to do something like Topic. It would still break on nil, but I find that the array you pass in is usually generated by a filter that will return [] at the very least and never nil. Then you could do: Topic. Like NewAlexandria said, this does not work when the variable is [] or nil.
You end up with id NOT in null. Note, however, that this method returns a string, and is not typecasted by Rails. Ordering by RAND is not a wise idea when you have a large table with lots of rows. Your database will have to calculate a different random value for every row in your database — O N — then sort the entire table by those values — O N log N. If your table is sparse, or does not have a primary key, consider adding an indexed column of random numbers between 0 and N. You can then order by this column quickly and choose a value using a method similar to the above example.
The :order parameter is not sanitized, so doing something like Person. You can only use. For example; the first works, but the second does not. In examples at least for version 2. The equivalent is the ActiveRecord finder methods.
This will return an OrderedHash of your attributes with a count for each. How about if you wanted to find a random set of records instead of a singular record, what would be the best way? If you want to fetch all records when one column boolean is set to nil or false, try this:. If you want to find any number of records without sorting your entire table randomly every time, try the solution I posted here:. APIdock copyright Nodeta Oy Flowdock is a collaboration tool for technical teams. Version control, project management, deployments and your group chat in one place.
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