Flowdock
select(value = Proc.new) public

No documentation

This method has no description. You can help the Ruby on Rails community by adding new notes.

Show source
Register or log in to add new notes.
November 24, 2014
1 thank

Arguments for .select must be array

Model.select(:field, :other_field, :and_one_more) has a typo. It must take an array of arguments as the description states:

Model.select([:field, :other_field, :and_one_more])

January 5, 2015
1 thank

arguments do not need to be an array

it’s a small point, but if you look at the source, the method is defined with the splat operator in the arguments:

def select (*fields)

this means that a list of arguments is automatically converted to an array. There is no typo in the description above.

It will also work to pass an array:

select([:field1, :field2])

although the select method interprets this as a single argument, and places it into an array (due to the splat operator), this is then passed to the _select(*fields) method, which immediately calls fields.flatten!

So either a list or an array may be passed, both will work.

December 20, 2017
0 thanks

Counting with select

If you try to write

Model.select('field_one', 'field_two AS something').count

it will fail (at least for Rails 5.0) with the message PG::SyntaxError: ERROR: syntax error at or near “AS”. In order to fix that issue, you should write

Model.select('field_one', 'field_two AS something').count(:all)