Software engineering facts, information, and skills tagged as Django
Regex and iregex are the two field lookups that enable us to search database with regular expressions. regex is case-sensitive where as iregexis case-insensitive.
In django, the NULL valuein the database field is tested with field lookup
isnull It takes either
False, which correspond to SQL queries of
IS NULL and
IS NOT NULL, respectively.
Field lookups are how we specify the conditions in the
WHERE clause of an SQL. They are specified as keyword arguments for QuerySet methodslike
js. The compressor combines the CSS/JS contained in the tag and save as a single file in static directory. Default location is
PostgreSQL could be configured to limit number of simultaneous connections to the database. The heroku comes with plans having connection limits. The 'Hopby' plans comes with 20 connections where as standard plans comes startings with 120 conection. When we start developing and testing, especially automated testings, the hobby plans raise error
PG::Error (FATAL: too many connections for role "xxxxxxx"). If we check the connections with heroku cli, we get
Python is an interpreted(processed at runtime by the interpreter), object-oriented(supports Object-Oriented style), interactive, simple, easy to learn, portable, extensible, embeddable, high-level programming language for general-purpose programming. Created by Guido van Rossum at the National Research Institute for Mathematics and Computer Science in the Netherlands and first released in 1991. Python is derived from ABC, Modula-3, SmallTalk, Algol-68, C, C++, Unix shell and other scripting languages.Python's source code is avaliable under the GNU General Public License (GPL) which guarantees end users the freedom to run, study, share and modify the software.
Django template tags allows passing multiple variables or values to the assignment tags. Most people knows passing one variable, but not many and we see many questions how to pass it. Most are confused because of the colon separated passing of values to filters. Comma separation wont work either. The Django supports it by putting space as the separator.