- User Profile 4:02
- Update Password 8:41
- Password Hashing 1 objective
- Creating Helper Functions 5:35
- User Administration Panel 5:18
- Changing User Role 2:40
- Guards and Helpers 5 questions
- Adding Authorization Checks 3:17
- Book Access 3:38
- Update Voting System 3:53
- Next Steps 1:14
- Authorized Login 5 questions
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Update Voting System
3:53Let’s make some updates to our voting system to make sure a user can have only a single vote registered per book. We are going to update our book list as well to show the way the user voted by changing the arrow color.
For the final step in
our book voting system,
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I want to be able to update
the way the voting works.
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Only authenticated users
should be able to vote.
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And each user only gets one vote per book,
but
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that user is always able
to change their vote.
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Let's take a look at our
functions_vote file.
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The first function gives us the saved vote
for a specific book by a specific user.
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The user ID is not required,
it will default to 0.
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The next function is the actual vote,
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It accepts a bookId, a score,
and an optional userId.
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This function calls
the clearVote function.
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That function accepts a bookId and
a userId, and
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attempts to delete that user's vote.
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If a vote is actually deleted,
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the function will return
a count greater than 0.
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The vote function will count that
as the user's vote and return true.
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This keeps the vote to 1 point instead of
jumping from positive 1 to negative 1.
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For more information,
see the notes associated with this video.
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If no vote was cleared, then we add
the user's vote to the database.
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Let's update our procedures/vote.php to
pass the ID of the authenticated user.
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First we'll add requireAuth,
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then we can get the user
= getAuthenticatedUser.
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And then we can pass user id.
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Next, we want to update our arrows to show
which way the current user has voted,
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so let's open book.php.
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The first thing that we'll need to
do is get the authenticated user.
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After we check if the user
is authenticated,
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we can do user = getAuthenticatedUser.
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Now, inside of the class of our up arrow,
we're going to add a php block.
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We can add as much space as we want,
so let's add some new lines.
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We're going to add a conditional
that checks if, getUserVote,
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And we pass the book,
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id, and the user id.
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And then we check to see if this equals 1.
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If it does, then we're going to echo,
space, orange.
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Make sure that we have a space
before our new orange class so
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that it doesn't get mixed up
with our previous classes.
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Let's copy this code block, And
we'll add it to our down arrow.
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Instead of 1,
we wanna look for negative 1.
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Now let's go back to the browser and
view the Book List page.
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We can now only make
a single vote per book,
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either we have no vote,
one vote up, or one vote down.
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