Hi Gustavo
Coincidentally, I was recently doing something similar. Older versions of
rails used to evaluate my previous solution using " | " to an
ActiveRelation. When this stopped I dont know, or maybe I am just mistaken.
In any case, I finally settled on using the squeel
gem<https://github.com/ernie/squeel>,
the arel docs, I agree are quite horrible.
There are examples on 'OR' queries with squeel on the github readme.
On Tue, May 22, 2012 at 11:18 PM, Gustavo de Sá Carvalho Honorato <
gustavohonor...@gmail.com> wrote:
> @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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>
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--
- Aziz M. Bookwala
Website <http://azizmb.in/> | Twitter <https://twitter.com/azizbookwala> |
Github <http://github.com/azizmb>
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