CODEWITHSUNDEEP
pythonsqlalchemy
chrizonline
chrizonline

Reputation: 4979

SQLAlchemy - adding OR condition with different filter

For the SQL statement, I want to do an OR filter only if the input variable is not None.

E.g

# input variable
var_1 = "apple"
var_2 = "pear"

query = session.query(Table)
if var_1:
    query = query.filter(or_(Table.field1 == var_1))
if var_2:
    query = query.filter(or_(Table.field2 == var_2))

But this is not possible. The 2nd query became an AND statement instead.

I don't want to do this because I don't want to compare an input variable if it's null or empty string.

query = query.filter(or_(Table.field1 == var_1, Table.field2 == var_2))

How do I solve this?

Upvotes: 7

Views: 8616

Answers (1)

alecxe
alecxe

Reputation: 473863

You can dynamically construct the "OR" part:

query = session.query(Table)

conditions = []
if abc:
    conditions.append(Table.field1 == abc)
if def:
    conditions.append(Table.field2 == def)

query = query.filter(or_(*conditions))

Also note that the def is a reserved word in Python, consider renaming this variable.

Upvotes: 26

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