text stringlengths 1 81 | start float64 0 10.1k | duration float64 0 24.9 |
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Then here in the template, I'm looping
over each one of those flights. | 4,053.52 | 3.3 |
For each one, printing
out a list item where | 4,056.82 | 2.91 |
I can access properties of that flight. | 4,059.73 | 1.87 |
Say flight this ID from origin
to a particular destination. | 4,061.6 | 7.07 |
So now, I'll go ahead
and go into my terminal. | 4,068.67 | 2.72 |
Run python manage.py
run server, which again, | 4,071.39 | 3.15 |
is how we run a Django web application. | 4,074.54 | 2.19 |
And now, if I go to that
URL, flash flights this time, | 4,076.73 | 3.21 |
because that's the URL. | 4,079.94 | 1.2 |
What I see is exactly
what I'd expect to see. | 4,081.14 | 2.19 |
An unordered list that just so happens
to have flight one New York to London | 4,083.33 | 5.58 |
displayed there. | 4,088.91 | 0.8 |
It is taking data from my database,
and now displaying it inside | 4,089.71 | 3.49 |
of this template. | 4,093.2 | 0.95 |
And if I were to add new flights, it
would also update on this page as well. | 4,094.15 | 4.249 |
So if I go ahead and go back, go into
the shell, python manage.py shell. | 4,098.399 | 4.221 |
I'll go from flights.models import star. | 4,102.62 | 3.569 |
Let's go ahead and-- | 4,106.189 | 2.34 |
well, all right, let's add a flight
from Shanghai to Paris, for example. | 4,108.529 | 3.04 |
Well, how do I get the airports
for Shanghai and Paris? | 4,111.569 | 3.051 |
Well, it turns out that
if I want to get Shanghai, | 4,114.62 | 2.71 |
I can say Shanghai
equals airport.objects. | 4,117.33 | 5.029 |
and then I can say-- | 4,122.359 | 1.201 |
if I do airport.objects.all, that gets
me all of the airports, for example. | 4,123.56 | 5.259 |
Oh, and it seems I don't
actually have a Shanghai one, | 4,128.819 | 2.511 |
but I can add one if I wanted to. | 4,131.33 | 1.81 |
But if I do airport.objects.all,
that, again, gives me all of them. | 4,133.14 | 3.99 |
But if I want to filter my airports
list, not get all of the airports | 4,137.13 | 3.17 |
but just get some of them, I can say
airport.objects.filter, and I can say, | 4,140.3 | 5.82 |
get me all the airports where the
city is New York, for example. | 4,146.12 | 6.409 |
And that is going to go ahead
and give me a query set that only | 4,152.529 | 2.921 |
contains the results that I care about. | 4,155.45 | 2.07 |
So again, airport.objects.filter lets
me constrain the results that come back. | 4,157.52 | 4.56 |
Not get me all of the
airports, but only get me | 4,162.08 | 2.46 |
airports whose city is
New York, for example. | 4,164.54 | 2.7 |
And it is only giving back one, so
I could say .filter city equals New | 4,167.24 | 3.3 |
York.first, to say, take that query
set, and just get me the first and only | 4,170.54 | 4.529 |
thing in that query set. | 4,175.069 | 1.201 |
And that gives me airport New York. | 4,176.27 | 2.72 |
A simplified way of
doing the same thing. | 4,178.99 | 1.72 |
If you know you're only going
to get one result back, is I | 4,180.71 | 2.85 |
can say something like
airport.objects.get, | 4,183.56 | 2.1 |
which will only get one result if it
knows that there's only going to be | 4,185.66 | 4.35 |
one airport with the city of New York. | 4,190.01 | 2.25 |
That too will return to
me New York JFK airport. | 4,192.26 | 4.38 |
But it will throw an error if
ever there's more than one, | 4,196.64 | 2.38 |
or if there's none, for example. | 4,199.02 | 1.76 |
So we'll go in and save
that inside of JFK, | 4,200.78 | 2.07 |
and we'll go ahead and
create a flight that is going | 4,202.85 | 2.64 |
from New York to Paris, for example. | 4,205.49 | 2.39 |
I can do CDG equals airport.objects.get. | 4,207.88 | 3.696 |
City equals Paris. | 4,211.576 | 1.774 |
And now, I have this variable CDG,
which represents the airport Paris. | 4,213.35 | 4.02 |
And if I want to create a new flight
that goes from New York to Paris, | 4,217.37 | 4.02 |
I can say F is going
to be a flight whose | 4,221.39 | 2.19 |
origin is JFK whose destination equals
CDG and whose duration equals 435. | 4,223.58 | 6.8 |
And I can save that flight as well. | 4,230.38 | 2.72 |
And so I've added a new flight. | 4,233.1 | 1.87 |
And so now, if I run the
server, python manage.py, | 4,234.97 | 3.73 |
run server, refresh the page, I
now see that I have two flights. | 4,238.7 | 4.9 |
One flight that's going from New
York to London, one flight that's | 4,243.6 | 2.75 |
going from New York to Paris. | 4,246.35 | 1.98 |
But of course, it's going to be
pretty annoying if every time I | 4,248.33 | 2.76 |
want to update the data, adding
new data, manipulating the data, | 4,251.09 | 3.18 |
I need to go into the
shell in order to run | 4,254.27 | 2.55 |
direct commands that are
able to add new flights, | 4,256.82 | 2.13 |
add new airport, so on and so forth. | 4,258.95 | 1.86 |
What I'd really like to be
able to do is just very simply | 4,260.81 | 3 |
to add it via a web interface. | 4,263.81 | 1.828 |
Via the web, be able
to say, all right, let | 4,265.638 | 1.792 |
me add a new flight that goes
from location 1 to location 2. | 4,267.43 | 3.82 |
And it's possible, using
the information we know now, | 4,271.25 | 2.64 |
to build a web page that does just this. | 4,273.89 | 2.73 |
But Django is built on this idea that
it doesn't want you, the programmer, | 4,276.62 | 3.84 |
to have to repeat work that
other people have already done. | 4,280.46 | 3 |
And this process of trying to
define models and very quickly be | 4,283.46 | 3.63 |
able to create and edit
and manipulate models | 4,287.09 | 2.07 |
is so common that Django has already
built for us an entire app that is just | 4,289.16 | 5.07 |
designed for the
manipulation of these models, | 4,294.23 | 2.73 |
and it's known as the Django admin app. | 4,296.96 | 3.06 |
And this is an app that
we've seen traces of already, | 4,300.02 | 2.49 |
that if we remember that urls.py
file from inside of our application. | 4,302.51 | 6.15 |
We saw that we added a
path for our own app, | 4,308.66 | 2.94 |
but there was already a path
given to us by default, /admin, | 4,311.6 | 3.96 |
that takes us to the admin app as well. | 4,315.56 | 3.37 |
And so in order to use
the admin app, we need | 4,318.93 | 2.54 |
to create an administrative account
inside of our Django web application. | 4,321.47 | 4.29 |
And the way to do that
is via the command line. | 4,325.76 | 2.34 |
I can run python manage.py
create super user. | 4,328.1 | 4.775 |
It's going to ask me for my name. | 4,332.875 | 1.375 |
I'll go in and type in my
user name, my email address, | 4,334.25 | 3.77 |
and it's also going
to ask for a password. | 4,338.02 | 1.75 |
I can just make up a password
that I would like to use. | 4,339.77 | 2.79 |
Retype it in just to confirm it. | 4,342.56 | 1.86 |
And now, Django has created a super user
account for me in this web application | 4,344.42 | 5.61 |
so that I, using these
credentials, have the ability | 4,350.03 | 2.91 |
to visit the web interface
for the admin app | 4,352.94 | 2.46 |
and actually manipulate some
of these underlying models. | 4,355.4 | 4.12 |
So in order to do this, the first
thing I need to do is take my models | 4,359.52 | 3.83 |
and add those models to the admin app. | 4,363.35 | 2.43 |
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