dgknght.app-lib.models — com.github.dgknght/app-lib 0.1.15

->id clj/s

(->id model-or-id)

Given a model with the id is stored at :id, or the id iteself, return the id.

E.g.: (->id 123) => 123 (->id {:id 456 :name "John"}) => 456

extract-nested clj/s

(extract-nested model base-key)

Given a model with an inner model nested at the top level via prefixed keys, returns a model with the nested model in a nested map. This is useful when storing data in a SQL database and you need to look up a relationship via SQL JOIN and then extract that model after read.

E.g. (extract-nested {:id 1 :order-number "001" :customer-id 2 :customer-name "John Doe"} :customer) => {:id 1 :order-number "001" :customer-id 2 :customer {:id 2 :name "John Doe"}}

map-index clj/s

(map-index values)

(map-index key-fn values)

Given a sequence of maps and a key function, returns a map of the values in the collection where the keys are the values retrieved by the key function.

E.g.: (index :id [{:id 1 :name "One"}]) => {1 {:id 1 :name "One"}}

nest clj/s

(nest collection)

(nest {:keys [parent-fn] :or {parent-fn :parent-id} :as opts} collection)

Given a collection of maps with recursive references, returns the same list with children assigned to their parents.

options: :id-fn - A key or fn that extracts the id from each model. Defaults to :id. :parent-fn - A key or fn that extracts the parent id from each model. Defaults to :parent-id. :decorate-child-fn - A function that receives a child and parent when the child is added to the parent :decorate-parent-fn - A function that receives each model that has children with the model as the first argument and the children as the second and returns the model.

unnest clj/s

(unnest collection)

(unnest options collection)

Given a nested collection, return a flattened list