Re: clj-record Library: Handling Namespaces
On 20 October 2010 10:09, Stefan Rohlfing stefan.rohlf...@gmail.com wrote:
Dear Clojure group,
I am currently reading chapter 9.1 MySQL clj-record of 'Clojure in
Action'.
clj-record seems pretty awesome, but I once again got lost in
namespace jungle.
Here is a concrete example:
File 1: src/active-record/credentials.clj
[Database credentials]
(ns active-record.credentials)
(def db
{:classname com.mysql.jdbc.Driver
:subprotocol mysql
:user
:password
:subname //localhost:3306/damages_dev
})
File 2: src/active-record/user.clj
[Belongs to the database name with the name 'users']
(ns active-record.user
(:use [active-record.credentials :only [db]])
(:require clj-record.boot))
(clj-record.core/init-model
(:associations
(has-many charges)))
File 3: src/active-record/charge.clj
[Belongs to the database name with the name 'charges']
(ns active-record.user
(:use [active-record.credentials :only [db]])
(:require clj-record.boot))
(clj-record.core/init-model
(:associations
(has-many charges)))
I want to add/remove/alter table entries in a different file:
File 4: src/active-record/program/core.clj
All my efforts to import the user.clj and charge.clj namespaces have
failed so far. For example, I have tried the following namespace
declaration:
(ns active-record.program.core
(:require [active-record.user :as user])
Just a guess, but try something other than user. The user namespace
is the default namespace when using the repl and maybe there's some
sort of conflict there.
I'm not sure how likely that is, but it's worth a try, I think :)
(:require [active-record.charge :as charge])
(:require clj-record.boot))
(user/create
{:login rob
:first_name Robert
:last_name Berger
:password secret
:email_address r...@runa.com})
;; No such var: user/create
;; [Thrown class java.lang.Exception]
This one doesn't work either:
(ns active-record.program.core
(:require [active-record.user :as user])
(:require [active-record.charge :as charge]))
;; EOF while reading
;; [Thrown class java.lang.Exception]
Can anybody tell me what went wrong in the example above?
--
Michael Wood esiot...@gmail.com
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Re: clj-record Library: Handling Namespaces
The name 'user' is taken from an example in the book. The author
executes the code at the REPL like this:
(require '(active-record [user :as user]))
user= (user/create {:login rob
:first_name Robert
:last_name Berger
:password secret
:email_address r...@runa.com})
And then there is the clj-record macro 'init-model' that creates a
model out of a Clojure namespace. However, I don't quite understand
how this affects bringing in the namespaces.
Here is the code:
http://github.com/duelinmarkers/clj-record/blob/master/src/clj_record/core.clj
(at the bottom)
On Oct 20, 4:20 pm, Michael Wood esiot...@gmail.com wrote:
On 20 October 2010 10:09, Stefan Rohlfing stefan.rohlf...@gmail.com wrote:
Dear Clojure group,
I am currently reading chapter 9.1 MySQL clj-record of 'Clojure in
Action'.
clj-record seems pretty awesome, but I once again got lost in
namespace jungle.
Here is a concrete example:
---
-
File 1: src/active-record/credentials.clj
[Database credentials]
(ns active-record.credentials)
(def db
{:classname com.mysql.jdbc.Driver
:subprotocol mysql
:user
:password
:subname //localhost:3306/damages_dev
})
---
-
File 2: src/active-record/user.clj
[Belongs to the database name with the name 'users']
(ns active-record.user
(:use [active-record.credentials :only [db]])
(:require clj-record.boot))
(clj-record.core/init-model
(:associations
(has-many charges)))
---
-
File 3: src/active-record/charge.clj
[Belongs to the database name with the name 'charges']
(ns active-record.user
(:use [active-record.credentials :only [db]])
(:require clj-record.boot))
(clj-record.core/init-model
(:associations
(has-many charges)))
---
-
I want to add/remove/alter table entries in a different file:
File 4: src/active-record/program/core.clj
All my efforts to import the user.clj and charge.clj namespaces have
failed so far. For example, I have tried the following namespace
declaration:
(ns active-record.program.core
(:require [active-record.user :as user])
Just a guess, but try something other than user. The user namespace
is the default namespace when using the repl and maybe there's some
sort of conflict there.
I'm not sure how likely that is, but it's worth a try, I think :)
(:require [active-record.charge :as charge])
(:require clj-record.boot))
(user/create
{:login rob
:first_name Robert
:last_name Berger
:password secret
:email_address r...@runa.com})
;; No such var: user/create
;; [Thrown class java.lang.Exception]
This one doesn't work either:
(ns active-record.program.core
(:require [active-record.user :as user])
(:require [active-record.charge :as charge]))
;; EOF while reading
;; [Thrown class java.lang.Exception]
Can anybody tell me what went wrong in the example above?
--
Michael Wood esiot...@gmail.com
--
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Re: clj-record Library: Handling Namespaces
Hi, On 20 Okt., 10:09, Stefan Rohlfing stefan.rohlf...@gmail.com wrote: ;; EOF while reading ;; [Thrown class java.lang.Exception] Are you sure, that you don't have some syntax error somewhere? Sincerely Meikel -- 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: clj-record Library: Handling Namespaces
You are right, there was a syntax error in charge.clj. However, after correcting the error I get the same error message as with the other namespace declaration: ;; No such var: user/create ;; [Thrown class java.lang.Exception] On Oct 20, 4:37 pm, Meikel Brandmeyer m...@kotka.de wrote: Hi, On 20 Okt., 10:09, Stefan Rohlfing stefan.rohlf...@gmail.com wrote: ;; EOF while reading ;; [Thrown class java.lang.Exception] Are you sure, that you don't have some syntax error somewhere? Sincerely Meikel -- 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: clj-record Library: Handling Namespaces
Hi, On 20 Okt., 10:46, Stefan Rohlfing stefan.rohlf...@gmail.com wrote: You are right, there was a syntax error in charge.clj. However, after correcting the error I get the same error message as with the other namespace declaration: Did you try the same with charge/create? Examples in books are not necessarily correct. Sincerely Meikel -- 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: clj-record Library: Handling Namespaces
Yes, I also tried charge/create. The error message is different, but it still does not work: ;; No such namespace: charge ;; [Thrown class java.lang.Exception] On Oct 20, 5:03 pm, Meikel Brandmeyer m...@kotka.de wrote: Hi, On 20 Okt., 10:46, Stefan Rohlfing stefan.rohlf...@gmail.com wrote: You are right, there was a syntax error in charge.clj. However, after correcting the error I get the same error message as with the other namespace declaration: Did you try the same with charge/create? Examples in books are not necessarily correct. Sincerely Meikel -- 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: clj-record Library: Handling Namespaces
Hi, On 20 Okt., 11:09, Stefan Rohlfing stefan.rohlf...@gmail.com wrote: Yes, I also tried charge/create. The error message is different, but it still does not work: More evidence for a problem with the user alias. Try a different one like (:require [active-record.user :as u]). Sincerely Meikel -- 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: clj-record Library: Handling Namespaces
Evaluating your suggested declaration: (ns active-record.program.core (:require [active-record.user :as u]) (:require [active-record.charge :as charge])) I get the following error message: ;; Unable to resolve symbol: user= in this context ;; [Thrown class java.lang.Exception] The same happens if I do not include the active-record.user namespace: (ns active-record.program.core (:require [active-record.charge :as charge])) ;; Unable to resolve symbol: user= in this context ;; [Thrown class java.lang.Exception] On Oct 20, 5:23 pm, Meikel Brandmeyer m...@kotka.de wrote: Hi, On 20 Okt., 11:09, Stefan Rohlfing stefan.rohlf...@gmail.com wrote: Yes, I also tried charge/create. The error message is different, but it still does not work: More evidence for a problem with the user alias. Try a different one like (:require [active-record.user :as u]). Sincerely Meikel -- 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: clj-record Library: Handling Namespaces
Hi, On 20 Okt., 11:35, Stefan Rohlfing stefan.rohlf...@gmail.com wrote: Evaluating your suggested declaration: (ns active-record.program.core (:require [active-record.user :as u]) (:require [active-record.charge :as charge])) I get the following error message: ;; Unable to resolve symbol: user= in this context ;; [Thrown class java.lang.Exception] You copy'n'pasted a clojure prompt somewhere or your repl is messed up. Please check your files thoroughly and (if necessary) start with a fresh repl. Sincerely Meikel -- 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: clj-record Library: Handling Namespaces
You were right again. I left a code snippet from the book in
charge.clj and forgot to remove it later.
Now everything seems to work fine, even when importing the active-
record.user namespace as 'user':
(ns active-record.program.core
(:require [active-record.user :as user])
(:require [active-record.charge :as charge]))
(user/create
{:login my-login
:first_name Stefan
:last_name Rohl
:password secret
:email_address ste...@example.com})
;; {:email_address ste...@example.com, :password secret,
;; :last_name Rohl, :first_name Stefan, :login my-login,
;; :id 8}
(charge/create
{:user_id 8,
:amount_dollars 27
:amount_cents 91
:category meals
:vendor_name Metro
:date 2010-01-15})
;; {:date 2010-01-15, :vendor_name Metro, :category meals,
;; :amount_cents 91, :amount_dollars 27, :id 7,
;; :user_id 8}
Thank you so much for your help! I really learned at lot about dealing
with namespaces today.
Stefan
On Oct 20, 5:45 pm, Meikel Brandmeyer m...@kotka.de wrote:
Hi,
On 20 Okt., 11:35, Stefan Rohlfing stefan.rohlf...@gmail.com wrote:
Evaluating your suggested declaration:
(ns active-record.program.core
(:require [active-record.user :as u])
(:require [active-record.charge :as charge]))
I get the following error message:
;; Unable to resolve symbol: user= in this context
;; [Thrown class java.lang.Exception]
You copy'n'pasted a clojure prompt somewhere or your repl is messed
up. Please check your files thoroughly and (if necessary) start with a
fresh repl.
Sincerely
Meikel
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Re: clj-record Library: Handling Namespaces
Hi, On 20 Okt., 14:04, Stefan Rohlfing stefan.rohlf...@gmail.com wrote: I really learned at lot about dealing with namespaces today. I hope you also learned a bit about error messages. ;) No such var: user/create: That means you get past the namespace declaration. Hence they load fine. But in the user namespace the model- init call was obviously not done. = Possible questions: maybe the file was not saved? maybe there is a spurious .class file around messing up things from a previous AOT compilation run? EOF while reading: Now something changed. Either in one of the :required namespaces was a syntax error introduced, or the init- model now happens and the syntax error is in a-r.program.core after the user/create call. I remembered darkly that I had once trouble with Vars which had the same name as an alias. Hence my questions: Did you try the same with charge instead of user? = Different alias. Does it work? Then the problem could be the alias. No such namespace: charge: So the alias is not done. That means that the error is either in user, during its alias creation or charge itself. Just to be sure my question: Does it work with a different alias instead of user? Unable to resolve symbol: user= in this context: again something changed in the files between our conversation. So we are targeting a moving target. Hence my request to really check the files and - if in doubt - use a fresh repl to get a clear foundattion. There were several occasions in the above description, where I'm expected an exception, but you didn't report one, and where I'm not sure whether this was due to the repl interaction or other side effects (eg. unsaved files, etc.). Also your positive report in the end leaves the question why it actually works now. From the code you pasted it should have worked from the beginning. Anyway, it works. :) Sincerely Meikel -- 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: clj-record Library: Handling Namespaces
I apologize for presenting you with a moving target. That was definitely not my attention. I should have realized I messed up the content of the files but unfortunately had no clue what all these exceptions meant. Therefore I really appreciate your detailed description of the conclusion you draw from the different error messages. Thanks again for your great help! Stefan On Oct 20, 8:34 pm, Meikel Brandmeyer m...@kotka.de wrote: Hi, On 20 Okt., 14:04, Stefan Rohlfing stefan.rohlf...@gmail.com wrote: I really learned at lot about dealing with namespaces today. I hope you also learned a bit about error messages. ;) No such var: user/create: That means you get past the namespace declaration. Hence they load fine. But in the user namespace the model- init call was obviously not done. = Possible questions: maybe the file was not saved? maybe there is a spurious .class file around messing up things from a previous AOT compilation run? EOF while reading: Now something changed. Either in one of the :required namespaces was a syntax error introduced, or the init- model now happens and the syntax error is in a-r.program.core after the user/create call. I remembered darkly that I had once trouble with Vars which had the same name as an alias. Hence my questions: Did you try the same with charge instead of user? = Different alias. Does it work? Then the problem could be the alias. No such namespace: charge: So the alias is not done. That means that the error is either in user, during its alias creation or charge itself. Just to be sure my question: Does it work with a different alias instead of user? Unable to resolve symbol: user= in this context: again something changed in the files between our conversation. So we are targeting a moving target. Hence my request to really check the files and - if in doubt - use a fresh repl to get a clear foundattion. There were several occasions in the above description, where I'm expected an exception, but you didn't report one, and where I'm not sure whether this was due to the repl interaction or other side effects (eg. unsaved files, etc.). Also your positive report in the end leaves the question why it actually works now. From the code you pasted it should have worked from the beginning. Anyway, it works. :) Sincerely Meikel -- 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
