Learn more about artificialintelligence with this collection
Find out the challenges it poses
Learn about the potential impact on society
Understanding the concept of Metaverse
Update
The ".update()" method is available on each queryset object of the ORM. For example, "Toy.objects.filter(price__lt=50).update(price=50)".
This would update the price of all toys that are below a certain price. While this is for a range of records, it could also be used to update a single record: "Toy.objects.filter(name="hippo").update(price=120)".
2
11 reads
MORE IDEAS ON THIS
Problems with save()
When updating an existing record, Django will update every field. That means, if you changed only one field on the model instance, all the fields will be updated (with the values staying the same). This is inefficient, especially if the model has many fields.
Another problem is that if ther...
2
20 reads
When to use save
- when creating a new record.
- you have a model instance already, and you need to change some field values.
- you've overridden the save() method to include some custom model logic.
- you defined pre_save and post_save signals for that model.
2
13 reads
Saving with update_fields
To prevent updating every field of the model you can use the update_fields parameter. It expects a list of fields that you want to save. The UPDATE that is run against the database then only updates those fields that you have specified.
For example, in case we only want to update the price ...
2
25 reads
When to use update
- you are updating fields of one or many records (note: update cannot be used to create a new record, like save can).
- you don't need to re-use a model instance after updating.
- you don't need your overridden save() method or any pre_save or post_save signals to run.
- you ...
2
12 reads
Save
The ".save()" method is used to write a model instance to the database. It can be an existing record or even a new one. For an existing record, Django will run a SQL UPDATE statement on the database. For a new record, Django will run an INSERT.
2
123 reads
Related collections
Other curated ideas on this topic:
Pick a transitional object for inspiration
A transitional object is someone or something with certain characteristics or qualities you can use as inspiration for new ideas.
For example, "What would Bruce Lee do?" He taught the importance of using the energy of your attacker. How might this inform your strategy?
The Charting Method
Divide the page into 3 columns and label each column by category. Fill the details of each category in the rows below.
This method is useful for lessons that cover a lot of facts or relationships between topics.
Emission Computed Tomography (ECT)
Emission Computed Tomography is the most invasive method for brain imaging. Its name comes from the emission of radioactive energy by tracers injected into the blood - which is a signature aspect of this approach to understanding the brain.
The two...
Read & Learn
20x Faster
without
deepstash
with
deepstash
with
deepstash
Personalized microlearning
—
100+ Learning Journeys
—
Access to 200,000+ ideas
—
Access to the mobile app
—
Unlimited idea saving
—
—
Unlimited history
—
—
Unlimited listening to ideas
—
—
Downloading & offline access
—
—
Supercharge your mind with one idea per day
Enter your email and spend 1 minute every day to learn something new.
I agree to receive email updates