Custom Django Transform with case statement for casting a string to either int or null
I’m trying to create a custom django lookup as_int so that you can easily compare and order the contents of text fields when they contain only a number, and treat them as NULL when they have the wrong format.
Using difference() on Django model and then creating aggregation annotation
I have a Django app that imports data from a third-party source and allows me to map it to standardized data sets using a translation table. The translation table takes two values from the source data (manufacturer and model) and returns the model ID for the matching model in the standardized data. The reason for the translation table is that the model description isn’t 100% consistent in the source data, so I might need to map 2 or 3 model #s in the source data to a single model # in the standardized model table.
Annotate django queryset based on related field attributes
Suppose you have this models structure in a django project
Is there a way to annotate the count for all objects without grouping by another column?
I have code that looks like the following:
Filter a query set depending on state at a given date
Given the following model (using django-simple-history):