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Rest with Express.js nested router
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You can nest routers by attaching them as middleware on an other router, with or without params.
You must pass {mergeParams: true} to the child router if you want to access the params from the parent router.
mergeParams was introduced in Expr...
postgresql: INSERT INTO … (SELECT * …)
...IMIT to specify top 20 rows, but I think you need to sort them using ORDER BY clause first.
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Convert Django Model object to dict with all of the fields intact
..._key_id': 2,
'id': 1,
'normal_value': 1,
'readonly_value': 2}
This is by far the simplest, but is missing many_to_many, foreign_key is misnamed, and it has two unwanted extra things in it.
2. model_to_dict
from django.forms.models import model_to_dict
model_to_dict(instance)
which returns...
Migration: Cannot add foreign key constraint
...table. Migrations get executed in the order they were created as indicated by the file name generated after running migrate:make. E.g. 2014_05_10_165709_create_student_table.php.
The solution was to rename the file with the foreign key to an earlier time than the file with the primary key as recomm...
Change the name of the :id parameter in Routing resources for Rails
...ram: :slug
# app/controllers/posts_controller.rb
# ...
@post = Post.find_by(slug: params[:slug])
# ...
As of the release of Rails 4, this functionality is documented in the Rails Guides.
Rails 3
Unfortunately, in Rails 3, the :key option for resources was removed, so you can no longer easily c...
Python assigning multiple variables to same value? list behavior
...tiple assignment as show below to initialize variables, but I got confused by the behavior, I expect to reassign the values list separately, I mean b[0] and c[0] equal 0 as before.
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How to set initial value and auto increment in MySQL?
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Heh, time passes by... Sure, define it in CREATE TABLE if you are able to do that. The second "ALTER TABLE" part of answer implies that you have already created a table, and it is probably already deployed somewhere without proper index, whic...
How can I update window.location.hash without jumping the document?
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There is a workaround by using the history API on modern browsers with fallback on old ones:
if(history.pushState) {
history.pushState(null, null, '#myhash');
}
else {
location.hash = '#myhash';
}
Credit goes to Lea Verou
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Handling a colon in an element ID in a CSS selector [duplicate]
...ession and my answer for more information.
– Mathias Bynens
Jul 6 '11 at 5:32
2
I just encountere...
How to change the foreign key referential action? (behavior)
... Shouldn't the constraint you add be ON DELETE RESTRICT as requested by the original question?
– Noumenon
Aug 2 '15 at 11:36
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