I recently came across the need to let admins create/edit specific objects from Django admin with an inline formset (nested forms). In Rails, this can be accomplished by simply doing this. accepts_nested_attributes_for :model Things are a little bit different in Django. As opposed to Rails, Django provides an admin interface by default but getting the same to work in a nested way isn’t very obvious. class Provider(models.Model): name = models.CharField(max_length=100) slug = models.
Today I ran into an issue while reading a quite significant mysql database table. I needed to fetch the records in batches so the good old find_in_batches method in rails ActiveRecord came into picture. Now the actual problem surfaced, as the lookup table was not having any sort of ID column present, the find_in_batches kept throwing an error Invalid Statement. After some debugging it came to light that find_in_batches by default only works with Integer only Primary Key fields, as it uses order to order the records as per the Integer Primary Key column.
Loads a namespace if not already loaded. It takes an argument(symbol) which should be a quoted (require 'clojure.string) ;; => nil After requiring a namespace, we need to refer the functions in a fully qualified names. Like, (require 'clojure.string) ;; => nil (clojure.string/split "This is an example of require" #" " ) ;; => ["This" "is" "an" "example" "of" "require"] Other way is to alias a namespace at the time of requring using as.
Vectors are another data structures from the clojure collections. They are indexed and are surrounded by  brackets and unlike lists they do not need to be quoted. [1 2 3] ; => [1 2 3] ;; another way to creating vectors (vector "a" "b" "c") ; => [1 2 3] (type ["a" "b" "c"]) ; => clojure.lang.PersistentVector Important to note that: (vector? ["a" "b" "c"]) ; => true ;; vectors are collections (coll?
Being fairly new to clojure ecosystem. I thought it would be better to be dedicating a post to each of the data structures in Clojure. Clojure has the following data structures ;; Lists ;; Vectors ;; Hashmaps ;; Sets These are concrete data types, which are implementation of abstract data types. This post will try to scratch the surface of - LISTS LISTS As the name goes, are a collection of group of values.
Clojure Data Types : Type A type is property some values share to collect all similar things. Every language has a type system. Some langugages have strict type system, some are relaxed. Clojure is a dynamic and strongly typed language: Dynamic - As the type checking is enforced on the fly/run time. Strong - As operations on improper types are not allowed and errored out. type function in clojure helps knowing what is the type of the expression.