com.wsscode.pathom3.connect.built-in.resolvers — com.wsscode/pathom3 2021.07.30-alpha

alias-resolver clj/s

(alias-resolver from to)

Create a resolver that will convert attribute from to a attribute to with the same value. This only creates the alias in one direction.

attr->sym clj/s

(attr->sym kw)

(attr->sym kw suffix)

attr-alias-resolver-name clj/s

(attr-alias-resolver-name from to)

(attr-alias-resolver-name from to suffix)

attr-munge clj/s

(attr-munge attr)

attr-ns clj/s

(attr-ns kw)

attribute-table-resolver clj/s

(attribute-table-resolver table-name attr-key output)

Similar to static-table-resolver, but instead of a static map, this will pull the table from another attribute in the system. Given in this case the values can be dynamic, this helper requires a pre-defined output, so the attributes on this output get delegated to the created resolver.

(def registry
  [(pbir/static-table-resolver `song-names :song/id
     {1 {:song/name "Marchinha Psicotica de Dr. Soup"}
      2 {:song/name "There's Enough"}})

   (pbir/constantly-resolver ::song-analysis
     {1 {:song/duration 280 :song/tempo 98}
      2 {:song/duration 150 :song/tempo 130}})

   (pbir/attribute-table-resolver ::song-analysis :song/id
     [:song/duration :song/tempo])])

(let [sm (psm/smart-map (pci/register registry)
           {:song/id 2})]
  (select-keys sm [:song/id :song/name :song/duration]))
; => #:song{:id 2, :name "There's Enough", :duration 150}

combine-names clj/s

(combine-names na nb)

constantly-fn-resolver clj/s

(constantly-fn-resolver attribute value-fn)

Create a simple resolver that always calls value-fn and return its value. Note that cache is disabled by default in this resolver.

constantly-resolver clj/s

(constantly-resolver attribute value)

Create a simple resolver that always return value for attribute.

edn-extract-attr-tables clj

(edn-extract-attr-tables data)

edn-file-resolver clj/s macro

(edn-file-resolver file-path)

Creates a resolver to provide data loaded from a file.

This is a macro and the file will be read at compilation time, this way it can work on both Clojure and Clojurescript, without a need for async processing.

It's also possible to provide static tables data (as with attribute-table-resolver) from the data itself, you can do this by setting the meta data :pathom3/entity-table meta data in your EDN data. For example:

{:my.system/generic-db
 ^{:com.wsscode.pathom3/entity-table :my.system/user-id}
 {4 {:my.system.user/name "Anne"}
  2 {:my.system.user/name "Fred"}}}

Doing this, the resolvers for the attribute table will be provided automatically.

Full example:

; my-config.edn
{:my.system/port
 1234

 :my.system/initial-path
 "/tmp/system"

 :my.system/generic-db
 ^{:com.wsscode.pathom3/entity-table :my.system/user-id}
 {4 {:my.system.user/name "Anne"}
  2 {:my.system.user/name "Fred"}}}

; app
(def registry [(edn-file-resolver "my-config.edn")])

(let [sm (psm/smart-map (pci/register registry) {:my.system/user-id 4})]
  (select-keys sm [:my.system/port :my.system.user/name])
; => {:my.system/port 1234, :my.system.user/name "Anne"}

Note that the tables need to be a value of a top level attribute of the config, if its deeper inside it won't work.

env-table-resolver clj/s

(env-table-resolver table-name attr-key output)

Similar to attribute-table-resolver, but pulls table from env instead of other resolver.

(def registry [(pbir/static-table-resolver `song-names :song/id {1 {:song/name "Marchinha Psicotica de Dr. Soup"} 2 {:song/name "There's Enough"}})

(pbir/env-table-resolver ::song-analysis :song/id [:song/duration :song/tempo])])

(def table {::song-analysis {1 {:song/duration 280 :song/tempo 98} 2 {:song/duration 150 :song/tempo 130}}})

; merge table into env (let [sm (psm/smart-map (merge (pci/register registry) table) {:song/id 2})] (select-keys sm [:song/id :song/name :song/duration])) ; => #:song{:id 2, :name "There's Enough", :duration 150}

equivalence-resolver clj/s

(equivalence-resolver attribute-a attribute-b)

Make two attributes equivalent. It's like alias-resolver, but returns a vector containing the alias in both directions.

extract-attr-tables clj/s

(extract-attr-tables data)

global-data-resolver clj/s

(global-data-resolver data)

Expose data as a resolver, note this data will be available everywhere in the system.

Works the same as edn-file-resolver, but uses the data directly instead of reading from a file. This also applies for the attribute tables inside the data.

single-attr-resolver clj/s

(single-attr-resolver source target f)

Apply fn f to input source and spits the result with the name target.

f receives a single argument, which is the attribute value from source.

single-attr-with-env-resolver clj/s

(single-attr-with-env-resolver source target f)

Similar single-attr-resolver, but f receives two arguments, env and the input.

static-attribute-map-resolver clj/s

(static-attribute-map-resolver input output mapping)

This is like the static-table-resolver, but provides a single attribute on each map entry.

(def registry
  [(pbir/static-attribute-map-resolver :song/id :song/name
     {1 "Marchinha Psicotica de Dr. Soup"
      2 "There's Enough"})

   (pbir/static-table-resolver `song-analysis :song/id
     {1 {:song/duration 280 :song/tempo 98}
      2 {:song/duration 150 :song/tempo 130}})])

(let [sm (psm/smart-map (pci/register registry)
           {:song/id 1})]
  (select-keys sm [:song/id :song/name :song/duration]))
; => #:song{:id 1, :name "Marchinha Psicotica de Dr. Soup", :duration 280}

static-table-resolver clj/s

(static-table-resolver attribute table)

(static-table-resolver resolver-name attribute table)

Exposes data for entities, indexes by attr-key. This is a simple way to extend/provide data for entities using simple Clojure maps. Example:

(def registry
  [(pbir/static-table-resolver :song/id
     {1 {:song/name "Marchinha Psicotica de Dr. Soup"}
      2 {:song/name "There's Enough"}})

   ; you can provide a name for the resolver, if so, prefer fully qualified symbols
   (pbir/static-table-resolver `song-analysis :song/id
     {1 {:song/duration 280 :song/tempo 98}
      2 {:song/duration 150 :song/tempo 130}})])

(let [sm (psm/smart-map (pci/register registry)
           {:song/id 1})]
  (select-keys sm [:song/id :song/name :song/duration]))
; => #:song{:id 1, :name "Marchinha Psicotica de Dr. Soup", :duration 280}

In this example, we create two different tables that provides data about songs, the entities are related by the keys on the table, the attr-key says what's the attribute name to be used to related the data, in this case we use :song/id on both, so they get connected by it.

table-output clj/s

(table-output table)

For a given static table, compute the accumulated output query of the entity values.