text stringlengths 1 81 | start float64 0 10.1k | duration float64 0 24.9 |
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be references to a particular airport. | 3,729.78 | 2.1 |
So that's something that's going
to need to change in the database. | 3,731.88 | 3.15 |
And to make that change, I can run
something like python manage.py | 3,735.03 | 4.86 |
migrate to go ahead and
apply those changes. | 3,739.89 | 2.58 |
We've now applied this
migration that we just created, | 3,742.47 | 3.09 |
and our database is now up to date. | 3,745.56 | 3.39 |
So what can we do? | 3,748.95 | 1.24 |
Well, now I can go ahead
and go back into the shell. | 3,750.19 | 2.96 |
And I'll just go ahead and
import from flights.models import | 3,753.15 | 3.27 |
star, import everything. | 3,756.42 | 2.23 |
And I can now create an airport. | 3,758.65 | 1.67 |
I can say something like JFK
equals an airport whose code is JFK | 3,760.32 | 5.94 |
and whose city is New York, for example. | 3,766.26 | 3.18 |
And then save that. | 3,769.44 | 1.44 |
I can create a London one. | 3,770.88 | 1.17 |
So LHR is an airport whose code
is LHR and whose city is London. | 3,772.05 | 5.6 |
And I can save that. | 3,777.65 | 1.413 |
You could create more. | 3,779.063 | 0.917 |
I could say CDG equals an airport
whose code is CDG and city is Paris. | 3,779.98 | 6.29 |
And maybe we'll do one more. | 3,786.27 | 1.4 |
We'll say NRT is the airport whose
code is NRT and whose city is Tokyo, | 3,787.67 | 5.44 |
for example. | 3,793.11 | 1.09 |
So I've created and saved four airports
that get added to my airport table. | 3,794.2 | 4.28 |
And now, I can add a flight. | 3,798.48 | 2.25 |
F equals flight whose origin
equals JFK whose destination equals | 3,800.73 | 5.97 |
London Heathrow and whose
duration equals 415 minutes. | 3,806.7 | 4.34 |
And I'll go ahead and save that as well. | 3,811.04 | 4.083 |
So I've now created four airports. | 3,815.123 | 1.417 |
I've created a flight and saved it. | 3,816.54 | 2.13 |
If I type F just for my
flight, I see that, all right, | 3,818.67 | 3.84 |
this is a flight from
New York to London. | 3,822.51 | 2.73 |
But I can also say what is
f.origin, and to write f.origin, | 3,825.24 | 5.49 |
that is now an airport object. | 3,830.73 | 1.92 |
It's JFK, in particular. | 3,832.65 | 1.26 |
And I can do f.origin.city to get the
city of the origin, which is New York. | 3,833.91 | 4.58 |
f.origin.code to get the code
of that airport, which is JFK. | 3,838.49 | 4.33 |
And if I start with an origin,
something like JFK or London Heathrow, | 3,842.82 | 3.9 |
I can say LHR.arrivals.all to
get all of the arrivals, all | 3,846.72 | 6.48 |
of the flights arriving
in London Heathrow. | 3,853.2 | 2.038 |
And it looks like there's
just one of them, which | 3,855.238 | 2.042 |
is this flight that I've just
created from New York that | 3,857.28 | 3.15 |
is going to London as well. | 3,860.43 | 2.58 |
And so this now gives us the
ability to manipulate SQL | 3,863.01 | 3.3 |
just by using these Python models. | 3,866.31 | 1.82 |
And I now have Python
classes that represent | 3,868.13 | 2.59 |
all of these various
different types of data. | 3,870.72 | 2.19 |
And now, instead of running
SQL queries like select star | 3,872.91 | 2.61 |
from flights or from
airports, I can just | 3,875.52 | 2.16 |
interact with these classes and
these properties on the classes, | 3,877.68 | 3.9 |
and Django takes care
of the process for me | 3,881.58 | 2.28 |
of figuring out what the
underlying SQL queries should be, | 3,883.86 | 3.03 |
executing those queries, and just
giving those results back to me. | 3,886.89 | 3.78 |
And we can begin now to design a
web application around this idea. | 3,890.67 | 3.9 |
That I can go into urls.py, and
lets add a url pattern that says, | 3,894.57 | 3.96 |
the default route. | 3,898.53 | 1.44 |
We'll go ahead and load the index view. | 3,899.97 | 2.19 |
Give it a name of index. | 3,902.16 | 1.2 |
Same as similar things
we've seen from last time. | 3,903.36 | 3.12 |
And now, what should we
do in the index view? | 3,906.48 | 3.06 |
Well, the index view, let's go ahead
and say, what I would like to do | 3,909.54 | 4.17 |
is just display a list
of all the flights. | 3,913.71 | 2.94 |
So I might from.models
import flight and airport. | 3,916.65 | 5.76 |
Or maybe I just need flight. | 3,922.41 | 1.297 |
I just want a list of all the flights. | 3,923.707 | 1.583 |
So I'm going to import
flight from all of my models. | 3,925.29 | 2.89 |
And now, what I'd like to do is return-- | 3,928.18 | 2.36 |
let's go ahead and render a
template called flight/index.html, | 3,930.54 | 4.8 |
and give index.html access
to a variable called flights. | 3,935.34 | 4.62 |
And what is that variable
going to be equal to? | 3,939.96 | 2.27 |
It's going to be equal
to flight.objects.all | 3,942.23 | 3.25 |
to get me all of the flights that
I would like to put right here. | 3,945.48 | 4.89 |
All right, so what can I do from now? | 3,950.37 | 1.66 |
Now, what I need to do is actually
create those individual templates. | 3,952.03 | 3.38 |
So inside of flights, I'll create
a new folder called templates. | 3,955.41 | 5.01 |
Inside of which I'll create
a new folder called flights. | 3,960.42 | 2.88 |
Inside of which I'll go ahead
and create a layout.html, | 3,963.3 | 2.73 |
much as we've done
before, where that layout | 3,966.03 | 2.22 |
is going to contain the basic
structure of our HTML page. | 3,968.25 | 4.56 |
So a head section whose title is
flights, and a body section that | 3,972.81 | 6.1 |
is going to have a block body,
and the end of the block. | 3,978.91 | 5.31 |
Much as before, this is the default
layout for this particular page. | 3,984.22 | 4.2 |
And then, I'll add a new template called
index.html that is going to extend | 3,988.42 | 5.31 |
flight/layout.html. | 3,993.73 | 2.67 |
And then, inside the
body of the page, I'm | 3,996.4 | 4.23 |
going to display an H1
that just says flights. | 4,000.63 | 3.21 |
And let's now create an
unordered list where I can now | 4,003.84 | 2.67 |
loop over for flight in flights. | 4,006.51 | 3.51 |
endfor to end the loop. | 4,010.02 | 1.53 |
But inside the loop, let
me create a list item | 4,011.55 | 2.65 |
where I just print out a flight-- | 4,014.2 | 3.44 |
maybe I'll print out the
flight and then flight.id | 4,017.64 | 3.9 |
to print out flight
1, flight 2, flight 3. | 4,021.54 | 2.4 |
And then, I'll print flight.origin
to flight.destination. | 4,023.94 | 6.1 |
So what I've done here
is create a template | 4,030.04 | 3.32 |
that I'm going to give access to a
variable called flights, where flights | 4,033.36 | 3.57 |
is going to be a variable that
represents all of the flights | 4,036.93 | 3.39 |
that I queried by running
flight.objects.all, that is my way | 4,040.32 | 3.72 |
using Django's API, using the functions
that it has given me access to, | 4,044.04 | 3.48 |
to say, take the flight and get all
of the flights that are stored inside | 4,047.52 | 4.56 |
of Django's database. | 4,052.08 | 1.44 |
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