Jack Ha Jack Ha - 3 months ago 13
Python Question

How to dynamically compose an OR query filter in Django?

From an example you can see a multiple OR query filter:

Article.objects.filter(Q(pk=1) | Q(pk=2) | Q(pk=3))


For example, this results in:

[<Article: Hello>, <Article: Goodbye>, <Article: Hello and goodbye>]


However, I want to create this query filter from a list. How to do that?

e.g.
[1, 2, 3] -> Article.objects.filter(Q(pk=1) | Q(pk=2) | Q(pk=3))

Answer

You could chain your queries as follows:

values = [1,2,3]

# Turn list of values into list of Q objects
queries = [Q(pk=value) for value in values]

# Take one Q object from the list
query = queries.pop()

# Or the Q object with the ones remaining in the list
for item in queries:
    query |= item

# Query the model
Article.objects.filter(query)
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