Rails where condition using NOT NIL

Question

Using the rails 3 style how would I write the opposite of   Foo includes  bar  where  bars  gt   id  gt nil     I want to find where id is NOT nil   I tried   Foo includes  bar  where  bars  gt   id  gt  nil   to sql   But that returns     gt   SELECT       foos     FROM         foos    WHERE     bars     id     1     That s definitely not what I need  and almost seems like a bug in ARel

User · Answer

Not sure of this is helpful but this what worked for me in Rails 4  Foo where not bar  nil

User · Answer

The canonical way to do this with Rails 3   Foo includes  bar  where  bars id IS NOT NULL     ActiveRecord 4 0 and above adds where not so you can do this   Foo includes  bar  where not  bars id    gt  nil  Foo includes  bar  where not bars    id  nil      When working with scopes between tables  I prefer to leverage merge so that I can use existing scopes more easily   Foo includes  bar  merge Bar where not id  nil     Also  since includes does not always choose a join strategy  you should use references here as well  otherwise you may end up with invalid SQL   Foo includes  bar      references  bar      merge Bar where not id  nil

User · Answer

It s not a bug in ARel  it s a bug in your logic   What you want here is   Foo includes  bar  where Bar arel table  id  not eq nil

User · Answer

With Rails 4 it s easy    Foo includes  bar  where not bars   id  nil     See also       http   guides rubyonrails org active record querying html not-conditions

User · Answer

For Rails4   So  what you re wanting is an inner join  so you really should just use the joins predicate     Foo joins  bar     Select   from Foo Inner Join Bars       But  for the record  if you want a  NOT NULL  condition simply use the not predicate   Foo includes  bar  where not bars   id  nil    Select   from Foo Left Outer Join Bars on    WHERE bars id IS NOT NULL   Note that this syntax reports a deprecation  it talks about a string SQL snippet  but I guess the hash condition is changed to string in the parser    so be sure to add the references to the end   Foo includes  bar  where not bars   id  nil   references  bar       DEPRECATION WARNING  It looks like you are eager loading table s   one   of        that are referenced in a string SQL snippet  For example   Post includes  comments  where  comments title    foo          Currently  Active Record recognizes the table in the string  and knows   to JOIN the comments table to the query  rather than loading comments   in a separate query  However  doing this without writing a full-blown   SQL parser is inherently flawed  Since we don t want to write an SQL   parser  we are removing this functionality  From now on  you must   explicitly tell Active Record when you are referencing a table from a   string   Post includes  comments  where  comments title    foo    references  comments

[ruby-on-rails] Rails where condition using NOT NIL

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