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#datomic
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2020-11-02
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lambdam10:11:29

Hello, I'm discovering Datomic entity specs. I tried to trigger an spec error and here is the message:

"Entity temp-id missing attributes [email protected] of spec :admin/validate"
The doc example gives:
"Entity 42 missing attributes [:user/email] of by :user/validate"}
Clearly, the serialization of the missing attribute seems to go wrong. I'm using the latest version of Datomic (`1.0.6202` ). Is it a known problem?

marshall17:11:54

can you share your :admin/validate spec ?

lambdam16:11:55

Here is the spec:

{:db/ident :admin/validate
 :db.entity/attrs [:admin/email :admin/hashed_password]}
and here are the attribute declarations:
{:db/ident :admin/email
 :db/valueType :db.type/string
 :db/unique :db.unique/identity
 :db/cardinality :db.cardinality/one
 :db.attr/preds myproject.entities.entity/email?}
{:db/ident :admin/hashed_password
 :db/valueType :db.type/string
 :db/cardinality :db.cardinality/one}
The only "particular" thing that I see is that the email field has an attibute predicate. Thanks

jaret17:11:14

Hey @U94V75LDV I've made a ticket to look at this more closely. I'll keep you updated on what I find could you DM me an e-mail so I can contact you in the event that this slack convo gets archived while I am poking around?

lambdam17:11:07

Thank you very much! I do it right now.

lambdam10:11:08

Also I noted those points that seem weird: 1 - The documentation says: :db/ensure is a virtual attribute. It is not added in the database; instead it triggers checkes based on the named entity. When I then pull all the attributes of the entity, the :db/ensure field appears.

{:db/id 17592186045425,
 :db/ensure [#:db{:id 17592186045420}],
 :user/hashed-password "...",
 ...}
I then don't get what is a "virtual attribute" then. 2 - After transacting successfully an entity with its spec "activated", I could then retract a field without triggering the entity spec:
(datomic.api/transact
  conn*
  [[:db/retract 17592186045425 :user/hashed_password]])
The resulting entity viiolates the spec but nothing was triggered. Is it the desired behaviour of entity specs? Thanks

bhurlow14:11:54

does Datomic use auto-discovery when integrating with the managed memcached in AWS? Or do we need to pass in each relevant memcached node individually?