>> size in this case is an pretty much an "alias" for count, thus it's
gonna work the same way as count when grouping.
I think that current #size don't behave like an alias for #count.
g = User.group(:role); g.load; g.count
=> {:normal=>3, :admin=>4}
g = User.group(:role); g.load; g.size
=> 2
When I call #load before #count or #size, a return value of #count don't
equals to a return value of #size.
>> Is there any particular reason to know how many records returned if you
are grouping?
I expect #count and #size to return same value.
It is not the case that I want to know how many records the grouping query
returns.
My ideal implementation:
g = User.group(:role); g.load; g.count
=> {:normal=>3, :admin=>4}
g = User.group(:role); g.load; g.size
=>{:normal=>3, :admin=>4}
or
g = User.group(:role); g.load; g.count
=> 2
g = User.group(:role); g.load; g.size
=>2
What do you think?
Thank you
2014年9月12日金曜日 8時21分39秒 UTC+9 Carlos Antonio da Silva:
>
> size in this case is an pretty much an "alias" for count, thus it's gonna
> work the same way as count when grouping.
>
> Is there any particular reason to know how many records returned if you
> are grouping?
>
> On Wed, Sep 10, 2014 at 11:16 AM, Shinohara Teruki <ts....@gmail.com
> <javascript:>> wrote:
>
>> ActiveRecord::Relation.size returns a Hash when I use a group method.
>> I think that a size method is expected to return integer typically.
>>
>> I propose this implementation:
>>
>> def size
>> if loaded?
>> @records.length
>> else
>> count_value = count(:all)
>> count_value.is_a?(Hash) ? count_value.length : count_value
>> end
>> end
>>
>> This is a current implementation:
>>
>> #
>> https://github.com/rails/rails/blob/master/activerecord/lib/active_record/relation.rb
>> # Returns size of the records.
>> def size
>> loaded? ? @records.length : count(:all)
>> end
>>
>>
>> A count method is implemented on calculations.rb.
>>
>> https://github.com/rails/rails/blob/master/activerecord/lib/active_record/relation/calculations.rb
>>
>>
>> What do you think?
>>
>> Thank you
>>
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>
>
>
> --
> At.
> Carlos Antonio
>
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