it's possible to query for optional parts on many relations?
Hi I'm trying to figure if I can make some parts of my query results to be optional, for example, given the following query: [:find ?name ?age :where [?m :person/name ?name] [?m :person/age ?age]] This will return all entities that has a :person/name and :person/age. Ok, so, if I want to make the name mandatory and the age optional, I can do: [:find ?name ?age :in $ :where [?m :person/name ?name] [(get-else $ ?m :person/age 0) ?age]] Ok, so, for single values that works great, but what about this: [:find ?m ?name (vec ?url) :in $ :where [?m :person/name ?name] [?m :photos ?p] [?p :file/url ?url]] On the previous query, it fetch every person that has at least 1 photo, but not those that has no photos. How do I make to the query to return all entities that has name, having photos or not (ideally the value would be a blank list for those without photos)? Best regards. --- Wilker Lúcio http://about.me/wilkerlucio/bio Woboinc Consultant +55 81 82556600 -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: it's possible to query for optional parts on many relations?
Forgot to mention, I tried the (get-else) but it raises an error about cardinality many not supported, so I guessed it doesn't works here... --- Wilker Lúcio http://about.me/wilkerlucio/bio Woboinc Consultant +55 81 82556600 On Thu, Sep 18, 2014 at 7:41 PM, Wilker wilkerlu...@gmail.com wrote: Hi I'm trying to figure if I can make some parts of my query results to be optional, for example, given the following query: [:find ?name ?age :where [?m :person/name ?name] [?m :person/age ?age]] This will return all entities that has a :person/name and :person/age. Ok, so, if I want to make the name mandatory and the age optional, I can do: [:find ?name ?age :in $ :where [?m :person/name ?name] [(get-else $ ?m :person/age 0) ?age]] Ok, so, for single values that works great, but what about this: [:find ?m ?name (vec ?url) :in $ :where [?m :person/name ?name] [?m :photos ?p] [?p :file/url ?url]] On the previous query, it fetch every person that has at least 1 photo, but not those that has no photos. How do I make to the query to return all entities that has name, having photos or not (ideally the value would be a blank list for those without photos)? Best regards. --- Wilker Lúcio http://about.me/wilkerlucio/bio Woboinc Consultant +55 81 82556600 -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: it's possible to query for optional parts on many relations?
Couldn't you just retrieve users and use entity to get their photos? On Thu, Sep 18, 2014 at 4:43 PM, Wilker wilkerlu...@gmail.com wrote: Forgot to mention, I tried the (get-else) but it raises an error about cardinality many not supported, so I guessed it doesn't works here... --- Wilker Lúcio http://about.me/wilkerlucio/bio Woboinc Consultant +55 81 82556600 On Thu, Sep 18, 2014 at 7:41 PM, Wilker wilkerlu...@gmail.com wrote: Hi I'm trying to figure if I can make some parts of my query results to be optional, for example, given the following query: [:find ?name ?age :where [?m :person/name ?name] [?m :person/age ?age]] This will return all entities that has a :person/name and :person/age. Ok, so, if I want to make the name mandatory and the age optional, I can do: [:find ?name ?age :in $ :where [?m :person/name ?name] [(get-else $ ?m :person/age 0) ?age]] Ok, so, for single values that works great, but what about this: [:find ?m ?name (vec ?url) :in $ :where [?m :person/name ?name] [?m :photos ?p] [?p :file/url ?url]] On the previous query, it fetch every person that has at least 1 photo, but not those that has no photos. How do I make to the query to return all entities that has name, having photos or not (ideally the value would be a blank list for those without photos)? Best regards. --- Wilker Lúcio http://about.me/wilkerlucio/bio Woboinc Consultant +55 81 82556600 -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: it's possible to query for optional parts on many relations?
Yes I could, but I'm trying to stick on the philosophy of define your data at query time, so I would like to move all query stuff to Datomic, also, even if I don't use, I still would like to know if that's possible, I'm still very noob to Datomic and so trying stuff around. But considering all kinds of complex stuff that Datomic support, I would be surprise if that wasn't possible to do at query time... So, what I do in my queries is just fetch all fields and name then by position, it's very flexible as long as I'm able to shape my data at query time, so, if there is a way to do it, I would love to know. Thanks. --- Wilker Lúcio http://about.me/wilkerlucio/bio Woboinc Consultant +55 81 82556600 On Thu, Sep 18, 2014 at 7:48 PM, Ashton Kemerling ashtonkemerl...@gmail.com wrote: Couldn't you just retrieve users and use entity to get their photos? On Thu, Sep 18, 2014 at 4:43 PM, Wilker wilkerlu...@gmail.com wrote: Forgot to mention, I tried the (get-else) but it raises an error about cardinality many not supported, so I guessed it doesn't works here... --- Wilker Lúcio http://about.me/wilkerlucio/bio Woboinc Consultant +55 81 82556600 On Thu, Sep 18, 2014 at 7:41 PM, Wilker wilkerlu...@gmail.com wrote: Hi I'm trying to figure if I can make some parts of my query results to be optional, for example, given the following query: [:find ?name ?age :where [?m :person/name ?name] [?m :person/age ?age]] This will return all entities that has a :person/name and :person/age. Ok, so, if I want to make the name mandatory and the age optional, I can do: [:find ?name ?age :in $ :where [?m :person/name ?name] [(get-else $ ?m :person/age 0) ?age]] Ok, so, for single values that works great, but what about this: [:find ?m ?name (vec ?url) :in $ :where [?m :person/name ?name] [?m :photos ?p] [?p :file/url ?url]] On the previous query, it fetch every person that has at least 1 photo, but not those that has no photos. How do I make to the query to return all entities that has name, having photos or not (ideally the value would be a blank list for those without photos)? Best regards. --- Wilker Lúcio http://about.me/wilkerlucio/bio Woboinc Consultant +55 81 82556600 -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Datomic group. To unsubscribe from this group and stop receiving emails from it, send an email to datomic+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
