@Rogerio: This way the scopes are merged with AND not OR
@Jeremy: I've read README and I haven't found a way to join scopes with OR,
as you mentioned. The only way I found is to join attributes with OR, not
scopes. I've tried that hack (where_clauses.join('OR')) before too. The
problem is that, for some reason, it don't work when we use the scope
chained with a association.
I've googled a lot and I found a lot of people complaining about this
missing feature. I'm a big fan of Rails, but it is a pitty that Rails
doesn't give any simple way to do that. I really want to avoid that, but
the best solution that I can see is to duplicate the code of the first two
scopes on find_visibles.
Thanks,
Gustavo
On Mon, May 21, 2012 at 10:25 PM, Rogerio Medeiros <arge...@gmail.com>wrote:
> try
>
> escopo: find_visibles, lambda { find_in_coverage.find_know_missing}
>
>
>
> 2012/5/21 Gustavo de Sá Carvalho Honorato <gustavohonor...@gmail.com>
>
>> The problem of the first solution is that "find_in_coverage |
>> find_known_missing" combined that way does not return a scope. It returns
>> two arrays each and applies | operator on the result. See:
>> http://www.ruby-doc.org/core-1.9.3/Array.html#method-i-7C
>>
>> I've looked arel docs (in fact, I just found poor docs). Can you please
>> point me where in docs is explaining how I can construct such query?
>>
>> Thanks for you attention,
>> Gustavo
>>
>>
>> On Fri, May 18, 2012 at 3:52 PM, azizmb.in <m...@azizmb.in> wrote:
>>
>>> To add to that, if you want to construct complex queries, you should
>>> have a look at arel <https://github.com/rails/arel>.
>>>
>>>
>>> On Sat, May 19, 2012 at 12:17 AM, azizmb.in <m...@azizmb.in> wrote:
>>>
>>>> AFAIK, something like this should work:
>>>>
>>>> def find_visibles
>>>> find_in_coverage | find_known_missing
>>>> end
>>>>
>>>>
>>>> On Fri, May 18, 2012 at 10:53 PM, Gustavo de Sá Carvalho Honorato <
>>>> gustavohonor...@gmail.com> wrote:
>>>>
>>>>> Hi all!
>>>>>
>>>>> I've googled all over and I couldn't find anything about chaining
>>>>> scopes with OR instead of the default AND.
>>>>>
>>>>> I have an Asset model with the following scopes:
>>>>>
>>>>> class Asset < ActiveRecord::Base
>>>>>
>>>>> (...)
>>>>>
>>>>> scope :find_in_coverage, lambda { where('timestamp(assets.found_at)
>>>>> >= ?', Asset.found_at_limit) }
>>>>> scope :find_unknown_in_coverage, where('assets.asset_type_id IS
>>>>> NULL').find_in_coverage
>>>>> scope :find_known_missing, lambda { where('assets.found_at < ? AND
>>>>> assets.asset_type_id IS NOT NULL', Asset.found_at_limit) }
>>>>>
>>>>> end
>>>>>
>>>>> I would like to create another scope ("find_visibles") which is the OR
>>>>> of "find_in_coverage" and "find_known_missing" scopes, like that:
>>>>>
>>>>> scope :find_visibles, find_in_coverage.find_know_missing
>>>>>
>>>>> The problem is that this method chain uses AND to concatenate WHERE
>>>>> clauses. I need this clauses to be concatenated using OR instead.
>>>>>
>>>>> How can I do that?
>>>>>
>>>>> Thanks in advance,
>>>>> Gustavo Honorato
>>>>>
>>>>> --
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>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> - Aziz M. Bookwala
>>>>
>>>> Website <http://azizmb.in/> | Twitter<https://twitter.com/azizbookwala>
>>>> | Github <http://github.com/azizmb>
>>>>
>>>>
>>>
>>>
>>> --
>>> - Aziz M. Bookwala
>>>
>>> Website <http://azizmb.in/> | Twitter <https://twitter.com/azizbookwala>
>>> | Github <http://github.com/azizmb>
>>>
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>>
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>
>
>
> --
> att,
>
> Rogerio
>
> A complicação se descomplica na mesma proporção que fazemos os nós se
> desatarem ao tecer o conhecimento do saber.
>
>
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