On 24 Aug 2016 1:49 p.m., "Bazley" <[email protected]> wrote:
>
> The first thing I do with it is this:
>
> if @new_relationships.any?
>
> So it looks like .any? affects the query? I would have thought rails
would perform the query, get all the records into @new_relationships, and
then count them. This is a surprising feature.
Surprising possibly, but it saved a lot of processor time. Such is the
magic of rails.
Colin
>
>
> On Wednesday, August 24, 2016 at 1:26:54 PM UTC+1, Frederick Cheung wrote:
>>
>>
>>
>> On Wednesday, August 24, 2016 at 1:11:42 PM UTC+1, Bazley wrote:
>>>
>>> This rails/sql code...
>>>
>>> @new_relationships = User.select('*')
>>> .from("(#{@rels_unordered.to_sql}) AS
rels_unordered")
>>> .joins("
>>> INNER JOIN relationships
>>> ON rels_unordered.id =
relationships.character_id
>>> ORDER BY relationships.created_at DESC
>>> ")
>>>
>>> produces a query that begins like this:
>>>
>>> SELECT COUNT(*) FROM (SELECT .....
>>>
>>> Why is it counting the records?? I haven't asked for a count. I simply
want to select all columns after the join:
>>>
>>
>> The code you posted above doesn't actually run any query - queries are
executed lazily. What are you doing with @new_relationships?
>>
>> Fred
>
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