Re: CRUD application backed only by immutable facts
It is not totally clear in your post how you want to keep the data? Is it in memory (with a transactional log somewhere)? If it is the case, you can do better than reducing the whole data set when executing a query: you can keep a cache of query results, or indexed data and maintain it, while still being purely functional. (For example by attaching those results as meta data to the data structure, and defining your own assoc-like functions that maintain a consistency of the meta-dataed query results) On Tue, Jun 5, 2012 at 1:59 AM, Kevin Lynagh ke...@keminglabs.com wrote: Has anyone seen or implemented a CRUD application in Clojure using a database of immutable facts? For instance, a traditional database table supporting a todo-list application has columns user_id, task_id, task_description, is_done A new row is created when a user adds a task. Then that row is updated so is_done = TRUE when the user checks the task off. With immutable facts this would instead be a collection of statements: User U added task T with description D at time T1 User U completed task T at time T2 To get a list of unfinished tasks for a user, you'd need to grab all the tasks from this transaction log, put them into a data structure, and then remove ones when you learn that they've been completed. Whatever is left over is the todo list. Nathan Marz talked about this in terms of big data: http://nathanmarz.com/blog/how-to-beat-the-cap-theorem.html and Datomic's big bet is that your life as a developer gets much easier when you just deal with (entity, attribute, value) + time. I buy it in theory, but I have no idea what to expect in terms of performance (e.g., how long would it take to find the current todo list of someone who has added and completed/removed a few thousand items?). Has anyone implemented this idea on Clojure datastructures using, say, (timestamp, keyseq, value) and reducing a ton of calls to assoc- in? Aside from speed, what are some other tradeoffs of an immutable approach? -- 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 -- Sent from an IBM Model M, 15 August 1989. -- 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
Creating a hashmap
Hello all, I'm studying a little bit of Clojure and facing a doubt here. I hava a list (a b c) and want to create a hashmap using the elements from this list. The keys will be a sequential number, and the values will be the values from the previous list. 1. list: (a b c) 2. desired hashmap: (hash-map 1 a 2 b 3 c) How can I achieve this in a idiomatic functional way? Cheers. And thank you for your attention. -- christian -- 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
Re: Creating a hashmap
(zipmap (range 1 4) [a b c]) On Tue, Jun 5, 2012 at 7:59 AM, Christian Guimaraes cguimaraes...@gmail.com wrote: Hello all, I'm studying a little bit of Clojure and facing a doubt here. I hava a list (a b c) and want to create a hashmap using the elements from this list. The keys will be a sequential number, and the values will be the values from the previous list. 1. list: (a b c) 2. desired hashmap: (hash-map 1 a 2 b 3 c) How can I achieve this in a idiomatic functional way? Cheers. And thank you for your attention. -- christian -- 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 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
Re: Creating a hashmap
Also, if you're looking to learn this kind of stuff, 4clojure.com is an excellent resource. On Tue, Jun 5, 2012 at 8:02 AM, Jay Fields j...@jayfields.com wrote: (zipmap (range 1 4) [a b c]) On Tue, Jun 5, 2012 at 7:59 AM, Christian Guimaraes cguimaraes...@gmail.com wrote: Hello all, I'm studying a little bit of Clojure and facing a doubt here. I hava a list (a b c) and want to create a hashmap using the elements from this list. The keys will be a sequential number, and the values will be the values from the previous list. 1. list: (a b c) 2. desired hashmap: (hash-map 1 a 2 b 3 c) How can I achieve this in a idiomatic functional way? Cheers. And thank you for your attention. -- christian -- 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 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
Re: Creating a hashmap
Or: (zipmap (map inc (range)) '(a b c)) Thanks, Ambrose On Tue, Jun 5, 2012 at 8:02 PM, Jay Fields j...@jayfields.com wrote: (zipmap (range 1 4) [a b c]) On Tue, Jun 5, 2012 at 7:59 AM, Christian Guimaraes cguimaraes...@gmail.com wrote: Hello all, I'm studying a little bit of Clojure and facing a doubt here. I hava a list (a b c) and want to create a hashmap using the elements from this list. The keys will be a sequential number, and the values will be the values from the previous list. 1. list: (a b c) 2. desired hashmap: (hash-map 1 a 2 b 3 c) How can I achieve this in a idiomatic functional way? Cheers. And thank you for your attention. -- christian -- 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 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 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
Re: Friend: an extensible authentication and authorization library for Clojure Ring webapps and services
Hi Chas, Was wondering whether there's been any work on extending Friend to OAuth stuff yet - I'm looking at implementing something that requires authentication with Twitter or Facebook, and haven't quite got my head around all the steps required to implement it myself... Thanks! - David On Thu, Apr 12, 2012 at 12:59 AM, Chas Emerick c...@cemerick.com wrote: For your consideration, a new library http://wp.me/p10OJi-d6: I’m hoping this can eventually be a warden/spring-security/everyauth /omniauth for Clojure; that is, a common abstraction for authentication and authorization mechanisms. Clojure has been around long enough that adding pedestrian things like form and HTTP Basic and $AUTH_METHOD_HERE to a Ring application should be easy. Right now, it’s not: either you’re pasting together a bunch of different libraries that don’t necessarily compose well together, or you get drawn into shaving the authentication and authorization yaks for the fifth time in your life so you can sleep well at night. Hopefully Friend will make this a solved problem, or at least push things in that direction. Read more here: http://wp.me/p10OJi-d6 Cheers, - Chas -- http://cemerick.com [Clojure Programming from O'Reilly](http://www.clojurebook.com) -- 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 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
Re: Creating a hashmap
Awesome... I'm studying lists manipulation. Solidifying this concept. The basic in Clojure, in my point of view. Thanks again. On Tue, Jun 5, 2012 at 1:03 PM, Ambrose Bonnaire-Sergeant abonnaireserge...@gmail.com wrote: Or: (zipmap (map inc (range)) '(a b c)) Thanks, Ambrose On Tue, Jun 5, 2012 at 8:02 PM, Jay Fields j...@jayfields.com wrote: (zipmap (range 1 4) [a b c]) On Tue, Jun 5, 2012 at 7:59 AM, Christian Guimaraes cguimaraes...@gmail.com wrote: Hello all, I'm studying a little bit of Clojure and facing a doubt here. I hava a list (a b c) and want to create a hashmap using the elements from this list. The keys will be a sequential number, and the values will be the values from the previous list. 1. list: (a b c) 2. desired hashmap: (hash-map 1 a 2 b 3 c) How can I achieve this in a idiomatic functional way? Cheers. And thank you for your attention. -- christian -- 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 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 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 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
Re: Creating a hashmap
Or: (zipmap (drop 1 (range)) '(a b c)) :-) Regards, BG On Tue, Jun 5, 2012 at 5:33 PM, Ambrose Bonnaire-Sergeant abonnaireserge...@gmail.com wrote: Or: (zipmap (map inc (range)) '(a b c)) Thanks, Ambrose On Tue, Jun 5, 2012 at 8:02 PM, Jay Fields j...@jayfields.com wrote: (zipmap (range 1 4) [a b c]) On Tue, Jun 5, 2012 at 7:59 AM, Christian Guimaraes cguimaraes...@gmail.com wrote: Hello all, I'm studying a little bit of Clojure and facing a doubt here. I hava a list (a b c) and want to create a hashmap using the elements from this list. The keys will be a sequential number, and the values will be the values from the previous list. 1. list: (a b c) 2. desired hashmap: (hash-map 1 a 2 b 3 c) How can I achieve this in a idiomatic functional way? Cheers. And thank you for your attention. -- christian -- 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 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 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 -- Baishampayan Ghose b.ghose at gmail.com -- 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
Re: Creating a hashmap
If I needed the range to be infinite I'd probably use: (zipmap (iterate inc 1) '(a b c)) On Tue, Jun 5, 2012 at 8:13 AM, Baishampayan Ghose b.gh...@gmail.comwrote: Or: (zipmap (drop 1 (range)) '(a b c)) :-) Regards, BG On Tue, Jun 5, 2012 at 5:33 PM, Ambrose Bonnaire-Sergeant abonnaireserge...@gmail.com wrote: Or: (zipmap (map inc (range)) '(a b c)) Thanks, Ambrose On Tue, Jun 5, 2012 at 8:02 PM, Jay Fields j...@jayfields.com wrote: (zipmap (range 1 4) [a b c]) On Tue, Jun 5, 2012 at 7:59 AM, Christian Guimaraes cguimaraes...@gmail.com wrote: Hello all, I'm studying a little bit of Clojure and facing a doubt here. I hava a list (a b c) and want to create a hashmap using the elements from this list. The keys will be a sequential number, and the values will be the values from the previous list. 1. list: (a b c) 2. desired hashmap: (hash-map 1 a 2 b 3 c) How can I achieve this in a idiomatic functional way? Cheers. And thank you for your attention. -- christian -- 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 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 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 -- Baishampayan Ghose b.ghose at gmail.com -- 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 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
Re: user.clj not working with lein 2.0
Does the :injections key replace the init.clj found in /.lein/? If I understood correctly, I had roughly the same problem...my code in init.clj (some debugging functions I always need available) is no more being loaded with lein2...should I use the :injections key instead? Thanks in advance... Jim On 05/06/12 04:12, Warren Lynn wrote: :injections works! slime works too (with slime-describe-symbol for doc). Thank you! On Jun 4, 11:05 pm, Phil Hagelbergp...@hagelb.org wrote: On Mon, Jun 4, 2012 at 5:55 PM, Warren Lynnwrn.l...@gmail.com wrote: (use 'clojure.repl) (use 'clojure.java.javadoc) But now in the REPL I don't have clojure.repl namespace available anymore. Can anyone tell me why user.clj does not take effect anymore? Thank you. Everything in clojure.repl has a nicer equivalent using slime, plus you don't have to re-use it every time you switch namespaces. If you need something loaded at boot you can use the :injections key in the user profile to have a vector of forms evaluated every time your project is started, but using it for clojure.repl is unnecessary if you use slime. -Phil -- 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
Re: Creating a hashmap
And a completely different approach:
(into {} (map-indexed #(vector (inc %1) %2) [a b c]))
Kind regards
Meikel
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Re: user.clj not working with lein 2.0
On Tue, Jun 5, 2012 at 5:20 AM, Jim - FooBar(); jimpil1...@gmail.com wrote: Does the :injections key replace the init.clj found in /.lein/? If I understood correctly, I had roughly the same problem...my code in init.clj (some debugging functions I always need available) is no more being loaded with lein2...should I use the :injections key instead? No, they serve different purposes. init.clj runs inside the Leiningen process itself. It's not checked explicitly for settings anymore, but it's currently still loaded. This may go away before the final release though since all the purposes it used to serve have been replaced. -Phil -- 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
Re: user.clj not working with lein 2.0
On 05/06/12 17:10, Phil Hagelberg wrote: On Tue, Jun 5, 2012 at 5:20 AM, Jim - FooBar();jimpil1...@gmail.com wrote: Does the :injections key replace the init.clj found in /.lein/? If I understood correctly, I had roughly the same problem...my code in init.clj (some debugging functions I always need available) is no more being loaded with lein2...should I use the :injections key instead? No, they serve different purposes. init.clj runs inside the Leiningen process itself. It's not checked explicitly for settings anymore, but it's currently still loaded. This may go away before the final release though since all the purposes it used to serve have been replaced. -Phil Ok I see... then why can I not use my debug-repl, which is located in init.clj ? It only works when I'm in the 'user' namespace...I think this worked perfectly ok in lein1...at any given time I could do (debug-repl) and I would get the appropriate repl. Now I have to move code around between namespaces or have the debug-repl in every single project of mine! any suggestions? Jim -- 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
Re: user.clj not working with lein 2.0
On 05/06/12 18:00, Jim - FooBar(); wrote: On 05/06/12 17:10, Phil Hagelberg wrote: On Tue, Jun 5, 2012 at 5:20 AM, Jim - FooBar();jimpil1...@gmail.com wrote: Does the :injections key replace the init.clj found in /.lein/? If I understood correctly, I had roughly the same problem...my code in init.clj (some debugging functions I always need available) is no more being loaded with lein2...should I use the :injections key instead? No, they serve different purposes. init.clj runs inside the Leiningen process itself. It's not checked explicitly for settings anymore, but it's currently still loaded. This may go away before the final release though since all the purposes it used to serve have been replaced. -Phil Ok I see... then why can I not use my debug-repl, which is located in init.clj ? It only works when I'm in the 'user' namespace...I think this worked perfectly ok in lein1...at any given time I could do (debug-repl) and I would get the appropriate repl. Now I have to move code around between namespaces or have the debug-repl in every single project of mine! any suggestions? Jim Sorry, rereading your answer made me think my question should have been: what has init.clj been replaced with? How can I always have my debug-repl? Jim -- 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
Re: user.clj not working with lein 2.0
On Tue, Jun 5, 2012 at 10:00 AM, Jim - FooBar(); jimpil1...@gmail.com wrote: Ok I see... then why can I not use my debug-repl, which is located in init.clj ? It only works when I'm in the 'user' namespace...I think this worked perfectly ok in lein1...at any given time I could do (debug-repl) and I would get the appropriate repl. Now I have to move code around between namespaces or have the debug-repl in every single project of mine! I don't think this is a Leiningen issue. Clojure provides no way to load something and have it referred in all namespaces. Even if it did, it never would have worked with init.clj even in Leiningen 1.x since that was loaded in a different process from your own code. Putting it in user.clj would solve the second problem but not the first. -Phil -- 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
Re: Creating a hashmap
On Tue, Jun 5, 2012 at 7:59 AM, Christian Guimaraes cguimaraes...@gmail.com wrote: I hava a list (a b c) and want to create a hashmap using the elements from this list. The keys will be a sequential number, and the values will be the values from the previous list. 1. list: (a b c) 2. desired hashmap: (hash-map 1 a 2 b 3 c) How can I achieve this in a idiomatic functional way? And now for something completely different: ([1 2 3] 0) 1 ([1 2 3] 1) 2 I refer, of course, to the strange property of vectors in that they are also functions of their index. So if you it's cool for you to have the list be a vector and the access to be vector first then 'key', then you need to write no code whatsoever. -- Timmy V. http://twonegatives.com/ http://five.sentenc.es/ -- Spend less time on mail. -- 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
Re: Creating a hashmap
Thanks for the tip, Timmy. This is a very interesting Vector feature. -- christian On Tue, Jun 5, 2012 at 7:13 PM, Tim Visher tim.vis...@gmail.com wrote: On Tue, Jun 5, 2012 at 7:59 AM, Christian Guimaraes cguimaraes...@gmail.com wrote: I hava a list (a b c) and want to create a hashmap using the elements from this list. The keys will be a sequential number, and the values will be the values from the previous list. 1. list: (a b c) 2. desired hashmap: (hash-map 1 a 2 b 3 c) How can I achieve this in a idiomatic functional way? And now for something completely different: ([1 2 3] 0) 1 ([1 2 3] 1) 2 I refer, of course, to the strange property of vectors in that they are also functions of their index. So if you it's cool for you to have the list be a vector and the access to be vector first then 'key', then you need to write no code whatsoever. -- Timmy V. http://twonegatives.com/ http://five.sentenc.es/ -- Spend less time on mail. -- 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 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
Re: user.clj not working with lein 2.0
On 05/06/12 18:17, Phil Hagelberg wrote: On Tue, Jun 5, 2012 at 10:00 AM, Jim - FooBar();jimpil1...@gmail.com wrote: Ok I see... then why can I not use my debug-repl, which is located in init.clj ? It only works when I'm in the 'user' namespace...I think this worked perfectly ok in lein1...at any given time I could do (debug-repl) and I would get the appropriate repl. Now I have to move code around between namespaces or have the debug-repl in every single project of mine! I don't think this is a Leiningen issue. Clojure provides no way to load something and have it referred in all namespaces. Even if it did, it never would have worked with init.clj even in Leiningen 1.x since that was loaded in a different process from your own code. Putting it in user.clj would solve the second problem but not the first. -Phil Cool thanks a lot for the prompt reply... Jim -- 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
Re: CRUD application backed only by immutable facts
Jonas,
Definitely inspired by the ideas in Datomic.
My question was partially: how can I implement the core immutability
semantics of Datomic in plain Clojure?.
(Say, hypothetically, that I need a Clojure datastore with flexible
schema and immutability semantics but cannot actually use Datomic for
business reasons.)
I gave it a shot this morning---writing code to serialize
{:a 1 :b 2}
into
[#Assertion{:id 1, :attribute :a, :value 1, :time 0},
#Assertion{:id 1, :attribute :b, :value 2, :time 0}]
and back again (which gets a bit more complex with references/
collections, but not much).
Nicolas,
Data can be kept anywhere that tuples can be kept = )
Caching intermediate values diffs are collapsed should definitely
bring a speedup.
The immutability semantics mean you really can go all out crazy with
the caching too.
On Jun 5, 1:44 am, nicolas.o...@gmail.com nicolas.o...@gmail.com
wrote:
It is not totally clear in your post how you want to keep the data?
Is it in memory (with a transactional log somewhere)?
If it is the case, you can do better than reducing the whole data set
when executing a query:
you can keep a cache of query results, or indexed data and maintain
it, while still being
purely functional. (For example by attaching those results as meta
data to the data structure, and
defining your own assoc-like functions that maintain a consistency of
the meta-dataed query results)
On Tue, Jun 5, 2012 at 1:59 AM, Kevin Lynagh ke...@keminglabs.com wrote:
Has anyone seen or implemented a CRUD application in Clojure using a
database of immutable facts?
For instance, a traditional database table supporting a todo-list
application has columns
user_id, task_id, task_description, is_done
A new row is created when a user adds a task.
Then that row is updated so is_done = TRUE when the user checks the
task off.
With immutable facts this would instead be a collection of statements:
User U added task T with description D at time T1
User U completed task T at time T2
To get a list of unfinished tasks for a user, you'd need to grab all
the tasks from this transaction log, put them into a data structure,
and then remove ones when you learn that they've been completed.
Whatever is left over is the todo list.
Nathan Marz talked about this in terms of big data:
http://nathanmarz.com/blog/how-to-beat-the-cap-theorem.html
and Datomic's big bet is that your life as a developer gets much
easier when you just deal with (entity, attribute, value) + time.
I buy it in theory, but I have no idea what to expect in terms of
performance (e.g., how long would it take to find the current todo
list of someone who has added and completed/removed a few thousand
items?).
Has anyone implemented this idea on Clojure datastructures using,
say, (timestamp, keyseq, value) and reducing a ton of calls to assoc-
in?
Aside from speed, what are some other tradeoffs of an immutable
approach?
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(and clojure clodiuno fun)
Hi, I just wanted to throw a message in the mailing list to THANK all the clojure dudes out there which does a magnificent job. Thank you guys. I'm having fun with it. It's fun to learn a language which aims to simplify things. I like to think of Clojure for the developer as the Force to the jedi... It's way efficient :D I unfortunately do not use it professionally (i do mainly java dev) but i'm trying to. Slowly but surely, i use it more and more. (By the way, I do not know if there are lots of java people here but to learn or tinker with a new java api, the repl is the tool you must use for that.) I also try the best and simply as i can to explain to other people why we could (must?) use it. It's kind of hard at times but i do not despair. It's like the dark ages of say Linux for instance or Lisp, good ideas tend to take a real long time to spread... Oh and by the way, i'm beginning to play with http://arduino.cc/en/ and i use the work https://github.com/nakkaya/clodiuno and https://github.com/samaaron/serial-port and it's also plain fun. Here's the result of my tinkering http://adumont.fr/blog/hello-world-in-morse-with-arduinoclodiuno/ I do not really know where i want to go with this. Like i said, just plain and simple thank you. @ardumont -- 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
