Compojure Destructuring and Datomic lookup

[Vaso Vukotic]

Concise question for the issue available here http://stackoverflow.com/questions/28890683/compojure-destructuring-making-integers-not-integers


Basically, I want to be able to navigate to localhost:4000/post1517172 where 1517172 is the post ID.

My handler.clj has the following relevant code:

   ;posts
  (GET "/post:id" [id :as request]
    ;(str "the blurb id is... " id)
    (def email (get-in request [:session :ze-auth-email]))
    (vb/post-page-draw email id))

Which returns a stacktrace.


Working code (where I have manually replaced the id in the call to  (vb/post-page-draw email id)

   ;posts
  (GET "/post:id" [id :as request]
    ;(str "the blurb id is... " id)
    (def email (get-in request [:session :ze-auth-email]))
    (vb/post-page-draw email 1517172))

the function invocation (vb/post-page-draw email 1517172) plays with Enlive and Datomic.  The number provided is the entity id and gets info from the Datomic local database.


My naming scheme is a little different ("blurbs" instead of "posts") but here is my stacktrace:

java.lang.Exception

processing rule: (q__7761 ?title ?content ?tags ?eid), message: processing clause: [?eid blurb/title ?title], message: Cannot resolve key: 17592186045616

datalog.clj:1440	datomic.datalog/eval-rule[fn]
datalog.clj:1420	datomic.datalog/eval-rule
datalog.clj:1463	datomic.datalog/eval-query
datalog.clj:1552	datomic.datalog/qsqr
datalog.clj:1509	datomic.datalog/qsqr
query.clj:622	datomic.query/q
api.clj:35	datomic.api/q
RestFn.java:439	clojure.lang.RestFn.invoke
dbmethods.clj:50	pachax.database.dbmethods/get-blurb-by-eid
blurb.clj:24	pachax.views.blurb/return-a-blurb
blurb.clj:70	pachax.views.blurb/blurb-content-transform
blurb.clj:75	pachax.views.blurb/blurb-page-draw
handler.clj:157	pachax.handler/fn
core.clj:104	compojure.core/make-route[fn]
core.clj:94	compojure.core/wrap-route-middleware[fn]
core.clj:41	compojure.core/if-route[fn]
core.clj:27	compojure.core/if-method[fn]
core.clj:118	compojure.core/routing[fn]
core.clj:2515	clojure.core/some
core.clj:118	compojure.core/routing
RestFn.java:139	clojure.lang.RestFn.applyTo
core.clj:626	clojure.core/apply
core.clj:123	compojure.core/routes[fn]
Var.java:379	clojure.lang.Var.invoke
handler.clj:254	pachax.handler/logged-in-verify[fn]
response.clj:34	compojure.response/eval1224[fn]
response.clj:7	compojure.response/eval1183[fn]
core.clj:104	compojure.core/make-route[fn]
core.clj:94	compojure.core/wrap-route-middleware[fn]
core.clj:41	compojure.core/if-route[fn]
core.clj:27	compojure.core/if-method[fn]
core.clj:118	compojure.core/routing[fn]
core.clj:2515	clojure.core/some
core.clj:118	compojure.core/routing
RestFn.java:139	clojure.lang.RestFn.applyTo
core.clj:626	clojure.core/apply
core.clj:123	compojure.core/routes[fn]
flash.clj:35	ring.middleware.flash/wrap-flash[fn]
anti_forgery.clj:90	ring.middleware.anti-forgery/wrap-anti-forgery[fn]
session.clj:98	ring.middleware.session/wrap-session[fn]
keyword_params.clj:35	ring.middleware.keyword-params/wrap-keyword-params[fn]
nested_params.clj:84	ring.middleware.nested-params/wrap-nested-params[fn]
multipart_params.clj:118	ring.middleware.multipart-params/wrap-multipart-params[fn]
params.clj:64	ring.middleware.params/wrap-params[fn]
cookies.clj:156	ring.middleware.cookies/wrap-cookies[fn]
absolute_redirects.clj:36	ring.middleware.absolute-redirects/wrap-absolute-redirects[fn]
resource.clj:26	ring.middleware.resource/wrap-resource[fn]
content_type.clj:30	ring.middleware.content-type/wrap-content-type[fn]
not_modified.clj:44	ring.middleware.not-modified/wrap-not-modified[fn]
x_headers.clj:71	ring.middleware.x-headers/wrap-xss-protection[fn]
x_headers.clj:38	ring.middleware.x-headers/wrap-frame-options[fn]
x_headers.clj:53	ring.middleware.x-headers/wrap-content-type-options[fn]
Var.java:379	clojure.lang.Var.invoke
reload.clj:18	ring.middleware.reload/wrap-reload[fn]
stacktrace.clj:17	ring.middleware.stacktrace/wrap-stacktrace-log[fn]
stacktrace.clj:80	ring.middleware.stacktrace/wrap-stacktrace-web[fn]
jetty.clj:18	ring.adapter.jetty/proxy-handler[fn]
(Unknown Source)	ring.adapter.jetty.proxy$org.eclipse.jetty.server.handler.AbstractHandler$ff19274a.handle
HandlerWrapper.java:116	org.eclipse.jetty.server.handler.HandlerWrapper.handle
Server.java:363	org.eclipse.jetty.server.Server.handle
AbstractHttpConnection.java:483	org.eclipse.jetty.server.AbstractHttpConnection.handleRequest
AbstractHttpConnection.java:920	org.eclipse.jetty.server.AbstractHttpConnection.headerComplete
AbstractHttpConnection.java:982	org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete
HttpParser.java:635	org.eclipse.jetty.http.HttpParser.parseNext
HttpParser.java:235	org.eclipse.jetty.http.HttpParser.parseAvailable
AsyncHttpConnection.java:82	org.eclipse.jetty.server.AsyncHttpConnection.handle
SelectChannelEndPoint.java:628	org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle
SelectChannelEndPoint.java:52	org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run
QueuedThreadPool.java:608	org.eclipse.jetty.util.thread.QueuedThreadPool.runJob
QueuedThreadPool.java:543	org.eclipse.jetty.util.thread.QueuedThreadPool$3.run
Thread.java:745	java.lang.Thread.run

Caused by java.lang.Exception

processing clause: [?eid blurb/title ?title], message: Cannot resolve key: 17592186045616

datalog.clj:1386	datomic.datalog/eval-clause[fn]
datalog.clj:1349	datomic.datalog/eval-clause
datalog.clj:1435	datomic.datalog/eval-rule[fn]
datalog.clj:1420	datomic.datalog/eval-rule
datalog.clj:1463	datomic.datalog/eval-query
datalog.clj:1552	datomic.datalog/qsqr
datalog.clj:1509	datomic.datalog/qsqr
query.clj:622	datomic.query/q
api.clj:35	datomic.api/q
RestFn.java:439	clojure.lang.RestFn.invoke
dbmethods.clj:50	pachax.database.dbmethods/get-blurb-by-eid
blurb.clj:24	pachax.views.blurb/return-a-blurb
blurb.clj:70	pachax.views.blurb/blurb-content-transform
blurb.clj:75	pachax.views.blurb/blurb-page-draw
handler.clj:157	pachax.handler/fn
core.clj:104	compojure.core/make-route[fn]
core.clj:94	compojure.core/wrap-route-middleware[fn]
core.clj:41	compojure.core/if-route[fn]
core.clj:27	compojure.core/if-method[fn]
core.clj:118	compojure.core/routing[fn]
core.clj:2515	clojure.core/some
core.clj:118	compojure.core/routing
RestFn.java:139	clojure.lang.RestFn.applyTo
core.clj:626	clojure.core/apply
core.clj:123	compojure.core/routes[fn]
Var.java:379	clojure.lang.Var.invoke
handler.clj:254	pachax.handler/logged-in-verify[fn]
response.clj:34	compojure.response/eval1224[fn]
response.clj:7	compojure.response/eval1183[fn]
core.clj:104	compojure.core/make-route[fn]
core.clj:94	compojure.core/wrap-route-middleware[fn]
core.clj:41	compojure.core/if-route[fn]
core.clj:27	compojure.core/if-method[fn]
core.clj:118	compojure.core/routing[fn]
core.clj:2515	clojure.core/some
core.clj:118	compojure.core/routing
RestFn.java:139	clojure.lang.RestFn.applyTo
core.clj:626	clojure.core/apply
core.clj:123	compojure.core/routes[fn]
flash.clj:35	ring.middleware.flash/wrap-flash[fn]
anti_forgery.clj:90	ring.middleware.anti-forgery/wrap-anti-forgery[fn]
session.clj:98	ring.middleware.session/wrap-session[fn]
keyword_params.clj:35	ring.middleware.keyword-params/wrap-keyword-params[fn]
nested_params.clj:84	ring.middleware.nested-params/wrap-nested-params[fn]
multipart_params.clj:118	ring.middleware.multipart-params/wrap-multipart-params[fn]
params.clj:64	ring.middleware.params/wrap-params[fn]
cookies.clj:156	ring.middleware.cookies/wrap-cookies[fn]
absolute_redirects.clj:36	ring.middleware.absolute-redirects/wrap-absolute-redirects[fn]
resource.clj:26	ring.middleware.resource/wrap-resource[fn]
content_type.clj:30	ring.middleware.content-type/wrap-content-type[fn]
not_modified.clj:44	ring.middleware.not-modified/wrap-not-modified[fn]
x_headers.clj:71	ring.middleware.x-headers/wrap-xss-protection[fn]
x_headers.clj:38	ring.middleware.x-headers/wrap-frame-options[fn]
x_headers.clj:53	ring.middleware.x-headers/wrap-content-type-options[fn]
Var.java:379	clojure.lang.Var.invoke
reload.clj:18	ring.middleware.reload/wrap-reload[fn]
stacktrace.clj:17	ring.middleware.stacktrace/wrap-stacktrace-log[fn]
stacktrace.clj:80	ring.middleware.stacktrace/wrap-stacktrace-web[fn]
jetty.clj:18	ring.adapter.jetty/proxy-handler[fn]
(Unknown Source)	ring.adapter.jetty.proxy$org.eclipse.jetty.server.handler.AbstractHandler$ff19274a.handle
HandlerWrapper.java:116	org.eclipse.jetty.server.handler.HandlerWrapper.handle
Server.java:363	org.eclipse.jetty.server.Server.handle
AbstractHttpConnection.java:483	org.eclipse.jetty.server.AbstractHttpConnection.handleRequest
AbstractHttpConnection.java:920	org.eclipse.jetty.server.AbstractHttpConnection.headerComplete
AbstractHttpConnection.java:982	org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete
HttpParser.java:635	org.eclipse.jetty.http.HttpParser.parseNext
HttpParser.java:235	org.eclipse.jetty.http.HttpParser.parseAvailable
AsyncHttpConnection.java:82	org.eclipse.jetty.server.AsyncHttpConnection.handle
SelectChannelEndPoint.java:628	org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle
SelectChannelEndPoint.java:52	org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run
QueuedThreadPool.java:608	org.eclipse.jetty.util.thread.QueuedThreadPool.runJob
QueuedThreadPool.java:543	org.eclipse.jetty.util.thread.QueuedThreadPool$3.run
Thread.java:745	java.lang.Thread.run

Caused by java.lang.IllegalArgumentException

Cannot resolve key: 17592186045616

datalog.clj:260	datomic.datalog/resolve-id
datalog.clj:267	datomic.datalog/dbrel
datalog.clj:314	datomic.datalog/fn
datalog.clj:278	datomic.datalog/fn[fn]
datalog.clj:1355	datomic.datalog/eval-clause[fn]
datalog.clj:1349	datomic.datalog/eval-clause
datalog.clj:1435	datomic.datalog/eval-rule[fn]
datalog.clj:1420	datomic.datalog/eval-rule
datalog.clj:1463	datomic.datalog/eval-query
datalog.clj:1552	datomic.datalog/qsqr
datalog.clj:1509	datomic.datalog/qsqr
query.clj:622	datomic.query/q
api.clj:35	datomic.api/q
RestFn.java:439	clojure.lang.RestFn.invoke
dbmethods.clj:50	pachax.database.dbmethods/get-blurb-by-eid
blurb.clj:24	pachax.views.blurb/return-a-blurb
blurb.clj:70	pachax.views.blurb/blurb-content-transform
blurb.clj:75	pachax.views.blurb/blurb-page-draw
handler.clj:157	pachax.handler/fn
core.clj:104	compojure.core/make-route[fn]
core.clj:94	compojure.core/wrap-route-middleware[fn]
core.clj:41	compojure.core/if-route[fn]
core.clj:27	compojure.core/if-method[fn]
core.clj:118	compojure.core/routing[fn]
core.clj:2515	clojure.core/some
core.clj:118	compojure.core/routing
RestFn.java:139	clojure.lang.RestFn.applyTo
core.clj:626	clojure.core/apply
core.clj:123	compojure.core/routes[fn]
Var.java:379	clojure.lang.Var.invoke
handler.clj:254	pachax.handler/logged-in-verify[fn]
response.clj:34	compojure.response/eval1224[fn]
response.clj:7	compojure.response/eval1183[fn]
core.clj:104	compojure.core/make-route[fn]
core.clj:94	compojure.core/wrap-route-middleware[fn]
core.clj:41	compojure.core/if-route[fn]
core.clj:27	compojure.core/if-method[fn]
core.clj:118	compojure.core/routing[fn]
core.clj:2515	clojure.core/some
core.clj:118	compojure.core/routing
RestFn.java:139	clojure.lang.RestFn.applyTo
core.clj:626	clojure.core/apply
core.clj:123	compojure.core/routes[fn]
flash.clj:35	ring.middleware.flash/wrap-flash[fn]
anti_forgery.clj:90	ring.middleware.anti-forgery/wrap-anti-forgery[fn]
session.clj:98	ring.middleware.session/wrap-session[fn]
keyword_params.clj:35	ring.middleware.keyword-params/wrap-keyword-params[fn]
nested_params.clj:84	ring.middleware.nested-params/wrap-nested-params[fn]
multipart_params.clj:118	ring.middleware.multipart-params/wrap-multipart-params[fn]
params.clj:64	ring.middleware.params/wrap-params[fn]
cookies.clj:156	ring.middleware.cookies/wrap-cookies[fn]
absolute_redirects.clj:36	ring.middleware.absolute-redirects/wrap-absolute-redirects[fn]
resource.clj:26	ring.middleware.resource/wrap-resource[fn]
content_type.clj:30	ring.middleware.content-type/wrap-content-type[fn]
not_modified.clj:44	ring.middleware.not-modified/wrap-not-modified[fn]
x_headers.clj:71	ring.middleware.x-headers/wrap-xss-protection[fn]
x_headers.clj:38	ring.middleware.x-headers/wrap-frame-options[fn]
x_headers.clj:53	ring.middleware.x-headers/wrap-content-type-options[fn]
Var.java:379	clojure.lang.Var.invoke
reload.clj:18	ring.middleware.reload/wrap-reload[fn]
stacktrace.clj:17	ring.middleware.stacktrace/wrap-stacktrace-log[fn]
stacktrace.clj:80	ring.middleware.stacktrace/wrap-stacktrace-web[fn]
jetty.clj:18	ring.adapter.jetty/proxy-handler[fn]
(Unknown Source)	ring.adapter.jetty.proxy$org.eclipse.jetty.server.handler.AbstractHandler$ff19274a.handle
HandlerWrapper.java:116	org.eclipse.jetty.server.handler.HandlerWrapper.handle
Server.java:363	org.eclipse.jetty.server.Server.handle
AbstractHttpConnection.java:483	org.eclipse.jetty.server.AbstractHttpConnection.handleRequest
AbstractHttpConnection.java:920	org.eclipse.jetty.server.AbstractHttpConnection.headerComplete
AbstractHttpConnection.java:982	org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete
HttpParser.java:635	org.eclipse.jetty.http.HttpParser.parseNext
HttpParser.java:235	org.eclipse.jetty.http.HttpParser.parseAvailable
AsyncHttpConnection.java:82	org.eclipse.jetty.server.AsyncHttpConnection.handle
SelectChannelEndPoint.java:628	org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle
SelectChannelEndPoint.java:52	org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run
QueuedThreadPool.java:608	org.eclipse.jetty.util.thread.QueuedThreadPool.runJob
QueuedThreadPool.java:543	org.eclipse.jetty.util.thread.QueuedThreadPool$3.run
Thread.java:745	java.lang.Thread.run

Any ideas on how I can fix this, or alternately how I can get the desired behavior?
Thanks in advance!

[James Reeves]

First of all, you're using "def" wrong. "def" defines a top-level var in the current namespace. It isn't local assignment. You want to use "let" instead.

Secondly, the type of the arguments change between your two examples. In the first example you pass in a string containing a number. In the second example you pass in the number directly (as a long).

You want something more like:

    (GET "/post:id" [id :as request]

      (let [email (get-in request [:session :ze-auth-email])]

        (vb/post-page-draw email (Long/parseLong id))))

- James

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