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core.clj
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core.clj
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(ns yadm.core
(:require [inflections.core :as inf]
[yadm.validation :as yv]
[yadm.utils :as yu]))
(defrecord DataMapper [settings])
(defn- entity-source
[dm-name]
(-> dm-name
(inf/underscore)
(.toLowerCase)
(inf/plural)
(keyword)))
(defn- entity-name
[dm-name]
(-> dm-name
(inf/hyphenate)
(.toLowerCase)
(keyword)))
(defonce ^:private default-settings
{:primary-key :id
:validations {}
:associations []
:before-validate []
:before-create []
:before-update []
:before-delete []
:after-validate []
:after-create []
:after-update []
:after-delete []})
(defn- reshape-settings
[settings]
(assoc settings
:primary-key
(yu/collify (:primary-key settings))))
(defn build-dm-settings
[dm-name settings]
(-> default-settings
(assoc :entity-source (entity-source dm-name))
(merge settings)
(assoc :entity-name (entity-name dm-name))
(reshape-settings)))
(defmacro defdatamapper
[dm-name & settings]
(assert (even? (count settings)) "datamapper settings must be a key/value pair")
`(def ~dm-name
(DataMapper. (build-dm-settings ~(name dm-name)
~(apply hash-map settings)))))
(defn datamapper?
[o]
(instance? DataMapper o))
(defn dm-setting
[dm setting]
(get-in dm [:settings setting]))
(deftype UpdatedValue [new-value])
(defn- updated-value?
[value]
(instance? UpdatedValue value))
(defn update-value
[value]
(UpdatedValue. value))
(defn update-field-with
[field f]
(fn [dm value]
(if (contains? value field)
(let [k (get value field)]
(update-value
(update-in value [field] f))))))
(deftype HaltedValue [error])
(defn- halted-execution?
[value]
(instance? HaltedValue value))
(defn halt-execution
[error]
(HaltedValue. error))
(defn- execute-function-pipeline
[initial-value dm fns]
(reduce
(fn [value f]
(let [r (f dm value)]
(cond
(updated-value? r) (.new-value r)
(halted-execution? r) (reduced r)
:else value)))
initial-value
fns))
(defn find-where
([dmi dm where-clause] (find-where dmi dm where-clause {}))
([dmi dm where-clause options]
(.find-where dmi dm where-clause options)))
(defn- validation-function-pipeline
[dm & v-options]
(flatten
[(dm-setting dm :before-validate)
(fn [dm value]
(let [v (apply yv/validate (flatten [(dm-setting dm :validations)
value
(or v-options [])]))]
(if (empty? v) ;; No validation error
v
(halt-execution [:validation v]))))
(dm-setting dm :after-validate)]))
(defn- format-pipeline-result
[r]
(if (halted-execution? r)
[:fail nil (.error r)]
[:ok r nil]))
(defn create!
([dmi dm data] (create! dmi dm data {}))
([dmi dm data options]
(-> data
(execute-function-pipeline
dm
(flatten [(validation-function-pipeline dm)
(dm-setting dm :before-create)
(fn [dm value]
(update-value (.create! dmi dm value options)))
(dm-setting dm :after-create)]))
(format-pipeline-result))))
(defn has-primary-key?
[dm data]
(let [pk (dm-setting dm :primary-key)]
(every? #(contains? data %) pk)))
(defn update!
([dmi dm data] (update! dmi dm data {}))
([dmi dm data options]
(when (empty? (dm-setting dm :primary-key))
(throw (Exception. (str "Unable to update an entity without PK: "
(dm-setting dm :entity-name)))))
(when-not (has-primary-key? dm data)
(throw (Exception. (str "data must contain the primary key: "
(dm-setting dm :entity-name)
" - "
(dm-setting dm :primary-key)))))
(-> data
(execute-function-pipeline
dm
(flatten [(validation-function-pipeline dm :defined-fields? true)
(dm-setting dm :before-update)
(fn [dm value]
(update-value (.update! dmi dm value options)))
(dm-setting dm :after-update)]))
(format-pipeline-result))))
(defn delete!
([dmi dm entity-id] (delete! dmi dm entity-id {}))
([dmi dm entity-id options]
(when (empty? (dm-setting dm :primary-key))
(throw (Exception. (str "Unable to delete an entity without PK: "
(dm-setting dm :entity-name)))))
(when-not (has-primary-key? dm entity-id)
(throw (Exception. (str "entity-id must contain the primary key: "
(dm-setting dm :entity-name)
" - "
(dm-setting dm :primary-key)))))
(-> entity-id
(execute-function-pipeline
dm
(flatten [(dm-setting dm :before-delete)
(fn [dm value]
(.delete! dmi dm entity-id options))
(dm-setting dm :after-delete)]))
(format-pipeline-result))))
(defn update-where!
([dmi dm data where-clause] (update-where! dmi dm data where-clause {}))
([dmi dm data where-clause options]
(.update-where! dmi dm data where-clause options)))
(defn delete-where!
([dmi dm where-clause] (delete-where! dmi dm where-clause {}))
([dmi dm where-clause options]
(.delete-where! dmi dm where-clause options)))