Back-End Programming Exam > Back-End Programming Videos > Django: The Ultimate Beginners Guide > Django Tutorial for Beginners - 12 - Writing Another View
Django Tutorial for Beginners - 12 - Writing Another View Video Lecture | Django: The Ultimate Beginners Guide - Back-End Programming
FAQs on Django Tutorial for Beginners - 12 - Writing Another View Video Lecture - Django: The Ultimate Beginners Guide - Back-End Programming
| 1. What is Django and what is it used for? |  |
Ans. Django is a high-level Python web framework that enables developers to build web applications quickly and efficiently. It follows the model-view-controller (MVC) architectural pattern and is known for its simplicity and scalability. Django is used primarily for developing database-driven websites and web applications.
| 2. How can I install Django on my computer? | |
Ans. To install Django on your computer, you can use pip, which is the package manager for Python. Open your command prompt or terminal and run the command "pip install django". This will download and install the latest version of Django. Make sure you have Python installed on your system before running this command.
| 3. What is a view in Django? | |
Ans. In Django, a view is a Python function that takes a web request as input and returns a web response. It is responsible for processing the request and delivering an appropriate response. Views are defined in Django's views.py file and are associated with specific URLs. They can fetch data from a database, render templates, and handle user input.
| 4. How can I create a new view in Django? | |
Ans. To create a new view in Django, you need to define a Python function in your views.py file. The function should take a request as an argument and return an HttpResponse object. You can write the logic for your view inside this function, such as fetching data from a database or rendering a template. Once you have defined the view function, you can map it to a URL in your project's urls.py file.
| 5. What is the purpose of writing another view in Django? | |
Ans. Writing another view in Django allows you to create different functionalities and behaviors for different URLs in your web application. Each view can handle specific requests and generate appropriate responses. By writing multiple views, you can separate the logic of your application into smaller, reusable components. This makes your code more organized, maintainable, and easier to understand.
Text Transcript from Video
all right hostas welcome back and in
this video what I'm going to do is I'm
going to be making another view aka we
are going to be adding another web page
to our website so let's just have a
little quick refresher on what a view is
a view is just a simple function that
returns some HTML that's all it is so we
need these because each URL pattern or
each URL is connected to a view so if we
want to simplify that even more each URL
is connected to an HTML response
obviously each webpage is connected to
some HTML that needs to be displayed
whenever you go to that so what I
thought would be pretty cool is if on
the music home page whenever the user
first goes to this section then they can
get kind of basically just look at all
of their albums so the album cover is
going to pop up and then they can scroll
through and when they click click click
click click one of these albums then
it's going to take them to a more
detailed view where they can see the
artists and you know all the songs in
the album name so on and so forth so
again we're going to have two pages the
first one is just the overview we're
going to see are all of your albums and
the second one is the detail view so
let's go ahead and make that detail view
structure right now so let's just go
ahead and do this this might be a little
bit easier above each of these patterns
I'm going to add a comment and just
write the exact pattern that it's
matching so this one we didn't match any
pattern so that means that they just
went to the home page with no extra
information after it now the pattern
that we're going to be matching in this
is this music and I think the best URL
structure is after music you just type
in the album ID so remember one let's
Taylor Swift 2 was myth but let's just
go ahead and put like um 71 in here just
so we have a little example that the
is what the structure is so basically
music followed by some ID so what we
always have to do whenever we're making
these patterns or trying to figure out
what the user typed in is always type
URL and then a regular expression so our
two single quotes my comma at the end
there so whenever you use regular
expressions 90% of time in these cases
use carat dollar sign
so the carat represents the beginning in
the dollar sign represents the end so
that's just how you signify beginning
and using rate expressions now what we
also want to do is we want to group
these together so a group takes a bunch
of things in signifies that this is one
item so that way whenever we type
something like 712 it doesn't view this
as seven one and two it's not three
different numbers it's actually one
number 712 so of course the user was
looking for album with the ID 712 and
not you know three different elbows so
later on whenever we figure out what
number these are typed in what album ID
they were looking for we're going to
have to pretty much save this as a
variable so we can use it in our code so
how do we do that well this is actually
kind of weird but your a question mark
capital P and then greater than and less
so go ahead and write something like
album idea right here so later on
whenever we look for this pattern and
extract the integer it's going to save
it as album ID so then we can just pass
in our function just like normal so
again I know it's weird but hey you got
a bling Jango and you know whoever came
up with a regular expression so there
you go all right now after this we can
finally start matching this pattern so
what are we looking for in ID number
well we're looking for a digit zero to
one first of all so how do we do that at
two square brackets in or a zero to nine
so this means that we're looking for a
number zero one two three four five six
seven eight nine now this is going to
great if we only have ten albums
possible but the thing is we are looking
for you know 11 and 12 in 100,000 so we
need to say okay this is going to match
any integer but we want these IDs to be
you know several decimal places long so
after this we write plus and this means
that this pattern is going to match any
um following integer so 7 1 2 is going
to hit or pretty much anything that's a
combination of single integers we're
going to group them together into one
single ID which is going to represent a
number sounds kind of weird but again
you have to write to the people making
regular expressions and blame them for
us and by the way once we do like 2 or 3
more you guys are going to like okay
you're just going to like type them as
fast and not even really think about it
this is probably only confusing the
first time but there you go so the next
thing we have to do after we find this
pattern is we need to connect it with a
view function so actually let's just go
ahead and make our view function right
now and I'm just going to name it detail
so every single View function is going
to take the request in the request is
just the HTML request and this is just
whenever they connect your site and
request something like a web page or an
image or whatever and there's a lot of
background information about this like
their IP address and yada yada we really
don't look at too much but that's what
that is now the next thing we really
care about is this album ID and again
like I said what this bit of code does
is it allows us to treat the album ID
just like a variable so we can just pass
it in and this is just going to be equal
to something like 1 or 2 or 712 or
10,000 whatever pretty awesome eh
alright so we have a function and now we
just need to return some HTML so return
HTTP response and let me just make this
a heading 2
and for this tutorial we are actually
going to connect to the database and
pull out you know like the album title
or the artist or anything like that got
a you know kind of try to keep things
simple here so I'll just say uh details
for for album on say album ID and then
let me go ahead and write string album
ID and I want to move this to the end as
well
alright looking good so that looks
pretty good whenever we call this
function is just going to turn details
for album ID one two three whatever make
sure I follow pep eight and have a blank
line at the end in art so remember that
function that we just created it is
called detail so whenever we want to
hook up a URL pattern to it we just need
to say view views because that's the
name of the module detail pretty cool
way and you don't add the parentheses at
the end because it knows all the
variables from these groups already so
the last thing I want to say is just is
add a name and just name it whatever the
function is and I'm not going to touch
on this because this is kind of what
we're going to use later but whenever
you have a name it allows you to do some
really cool things in your HTML later on
so there you go now
actually there's one other thing before
I forget so what this does is it looks
at this and it's going to pull out the
number however what we need to do is we
need to say ok this pattern also has a
little forward slash after it so look
for the pattern with the number and the
forward slash pull out the number entry
to is album ID and we're just going to
ignore the forward slash that isn't part
of the group alright cool enough now let
me just refresh this alright that still
works now let's go ahead and
check out this whenever they go to album
ID - it says details for album ID - and
this is going to be myth whenever they
go to one there we go it's going to
display Taylor Swift and right now we
can even go to three or any number such
as bata bata whatever and that is
because we are not actually connecting
to the database yet in validating that
is a valid album ID and we actually have
something stored for it
so that's your basics of views again
it's actually really simple just look
for whatever URL the user typed in and
connect it to one of these functions
right in there all the tutorials online
and all the documentation makes it seem
really hard but it's not so yeah that's
it I'll see you guys next time
this video what I'm going to do is I'm
going to be making another view aka we
are going to be adding another web page
to our website so let's just have a
little quick refresher on what a view is
a view is just a simple function that
returns some HTML that's all it is so we
need these because each URL pattern or
each URL is connected to a view so if we
want to simplify that even more each URL
is connected to an HTML response
obviously each webpage is connected to
some HTML that needs to be displayed
whenever you go to that so what I
thought would be pretty cool is if on
the music home page whenever the user
first goes to this section then they can
get kind of basically just look at all
of their albums so the album cover is
going to pop up and then they can scroll
through and when they click click click
click click one of these albums then
it's going to take them to a more
detailed view where they can see the
artists and you know all the songs in
the album name so on and so forth so
again we're going to have two pages the
first one is just the overview we're
going to see are all of your albums and
the second one is the detail view so
let's go ahead and make that detail view
structure right now so let's just go
ahead and do this this might be a little
bit easier above each of these patterns
I'm going to add a comment and just
write the exact pattern that it's
matching so this one we didn't match any
pattern so that means that they just
went to the home page with no extra
information after it now the pattern
that we're going to be matching in this
is this music and I think the best URL
structure is after music you just type
in the album ID so remember one let's
Taylor Swift 2 was myth but let's just
go ahead and put like um 71 in here just
so we have a little example that the
is what the structure is so basically
music followed by some ID so what we
always have to do whenever we're making
these patterns or trying to figure out
what the user typed in is always type
URL and then a regular expression so our
two single quotes my comma at the end
there so whenever you use regular
expressions 90% of time in these cases
use carat dollar sign
so the carat represents the beginning in
the dollar sign represents the end so
that's just how you signify beginning
and using rate expressions now what we
also want to do is we want to group
these together so a group takes a bunch
of things in signifies that this is one
item so that way whenever we type
something like 712 it doesn't view this
as seven one and two it's not three
different numbers it's actually one
number 712 so of course the user was
looking for album with the ID 712 and
not you know three different elbows so
later on whenever we figure out what
number these are typed in what album ID
they were looking for we're going to
have to pretty much save this as a
variable so we can use it in our code so
how do we do that well this is actually
kind of weird but your a question mark
capital P and then greater than and less
so go ahead and write something like
album idea right here so later on
whenever we look for this pattern and
extract the integer it's going to save
it as album ID so then we can just pass
in our function just like normal so
again I know it's weird but hey you got
a bling Jango and you know whoever came
up with a regular expression so there
you go all right now after this we can
finally start matching this pattern so
what are we looking for in ID number
well we're looking for a digit zero to
one first of all so how do we do that at
two square brackets in or a zero to nine
so this means that we're looking for a
number zero one two three four five six
seven eight nine now this is going to
great if we only have ten albums
possible but the thing is we are looking
for you know 11 and 12 in 100,000 so we
need to say okay this is going to match
any integer but we want these IDs to be
you know several decimal places long so
after this we write plus and this means
that this pattern is going to match any
um following integer so 7 1 2 is going
to hit or pretty much anything that's a
combination of single integers we're
going to group them together into one
single ID which is going to represent a
number sounds kind of weird but again
you have to write to the people making
regular expressions and blame them for
us and by the way once we do like 2 or 3
more you guys are going to like okay
you're just going to like type them as
fast and not even really think about it
this is probably only confusing the
first time but there you go so the next
thing we have to do after we find this
pattern is we need to connect it with a
view function so actually let's just go
ahead and make our view function right
now and I'm just going to name it detail
so every single View function is going
to take the request in the request is
just the HTML request and this is just
whenever they connect your site and
request something like a web page or an
image or whatever and there's a lot of
background information about this like
their IP address and yada yada we really
don't look at too much but that's what
that is now the next thing we really
care about is this album ID and again
like I said what this bit of code does
is it allows us to treat the album ID
just like a variable so we can just pass
it in and this is just going to be equal
to something like 1 or 2 or 712 or
10,000 whatever pretty awesome eh
alright so we have a function and now we
just need to return some HTML so return
HTTP response and let me just make this
a heading 2
and for this tutorial we are actually
going to connect to the database and
pull out you know like the album title
or the artist or anything like that got
a you know kind of try to keep things
simple here so I'll just say uh details
for for album on say album ID and then
let me go ahead and write string album
ID and I want to move this to the end as
well
alright looking good so that looks
pretty good whenever we call this
function is just going to turn details
for album ID one two three whatever make
sure I follow pep eight and have a blank
line at the end in art so remember that
function that we just created it is
called detail so whenever we want to
hook up a URL pattern to it we just need
to say view views because that's the
name of the module detail pretty cool
way and you don't add the parentheses at
the end because it knows all the
variables from these groups already so
the last thing I want to say is just is
add a name and just name it whatever the
function is and I'm not going to touch
on this because this is kind of what
we're going to use later but whenever
you have a name it allows you to do some
really cool things in your HTML later on
so there you go now
actually there's one other thing before
I forget so what this does is it looks
at this and it's going to pull out the
number however what we need to do is we
need to say ok this pattern also has a
little forward slash after it so look
for the pattern with the number and the
forward slash pull out the number entry
to is album ID and we're just going to
ignore the forward slash that isn't part
of the group alright cool enough now let
me just refresh this alright that still
works now let's go ahead and
check out this whenever they go to album
ID - it says details for album ID - and
this is going to be myth whenever they
go to one there we go it's going to
display Taylor Swift and right now we
can even go to three or any number such
as bata bata whatever and that is
because we are not actually connecting
to the database yet in validating that
is a valid album ID and we actually have
something stored for it
so that's your basics of views again
it's actually really simple just look
for whatever URL the user typed in and
connect it to one of these functions
right in there all the tutorials online
and all the documentation makes it seem
really hard but it's not so yeah that's
it I'll see you guys next time
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Oct 24, 2024 Last updated |
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