bookstore | express MongoDB 搭建一个简单的图书小店 | Runtime Evironment library
kandi X-RAY | bookstore Summary
kandi X-RAY | bookstore Summary
express + MongoDB 搭建一个简单的图书小站.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of bookstore
bookstore Key Features
bookstore Examples and Code Snippets
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
/**
* set a default to use when no profile is configured.
*/
DefaultProfileUtil.addDefaultProfile(application.applica
Community Discussions
Trending Discussions on bookstore
QUESTION
This is sort of a "best practices" question, since I'm not clear on the right way to handle this case.
The situation is that I have a bookstore app with a list of books
that exists as state.bookstore.books
. When the visitor loads the index page of the bookstore, a thunk
action is dispatched that loads all the book
objects in the user's collection into the state.bookstore.books
array.
From the bookstore page, a user can click on an individual book, and a new page is loaded that pulls the book
item from the state books
array and displays the details.
My problem is that if a user directly visits the book detail link (eg. "mysite.com/book/123") without first going through the homepage, the state.bookstore.books
array is empty, and the page has no data to display.
My question is what is the "right" way to do this? Would I dispatch the loadBookstore
action to populate the state anytime the app is initialized? Would I create a new redux feature for book
? Would I ignore looking up the book
in the state, and just grab the specific book
record from the server?
I am assuming that I'm doing it wrong / implementing an anti-pattern because selectors are not built to take parameters, so it seems like since there's no easy way to grab book 123
from the store, then I shouldn't be doing it this way.
ANSWER
Answered 2021-Jun-14 at 04:40Let's say we have 2 components
BooksHome
for/books/
SingleBook
for/books/:id
So when the user visits /books/
route, fire a thunk fetchBooks(..)
which loads books and saves them in state.bookstore.books
and display those books in BooksHome
And when the user visits /books/:id
route, fire a thunk fetchSingleBook(..)
which will find book item with :id
in state.bookstore.books
if that's present return it and display it in SingleBook
and if it's not there, fetch it, add it to state.bookstore.books
and return it and display it in
SingleBook
.
Explanation:
When the user visits /books/123
right away, state.bookstore.books
is []
so no item is found, so we'll fetch it, store it and display it.
When the user visits /books/
(data fetched and stored) and then visits /books/123
, state.bookstore.books
is having an item with id:123
so the item is found, so we'll get it from state.bookstore.books
and display it.
Must do things:
fetchBooks
must be dispatched inBooksHome
but not inApp
- Same way
fetchSingleBook
must be dispatched inSingleBook
Things optimised with this approach:
- We need not fetch all books for displaying a single book.
- We need not re-fetch book's data when it is already available in
state.bookstore.books
Hope this helps🤝
QUESTION
Building on Count number of elements with same tag
I will be running this query with BaseX 9.5.2.
Given the data
...ANSWER
Answered 2021-Jun-08 at 19:56Due to the grouping you already have, count($elems)
will have the right value in the return
clause.
I think you original use of the let $sep
is causing problems, the grouping count($elems)
I suggested works fine for me at https://xqueryfiddle.liberty-development.net/bFDbxm7 where I have moved the $sep
to a declared variable.
QUESTION
Building upon books.xml transform to CSV: repeat title on each row:
For the document below, how can I count
- the number of authors per book
- the number of unique authors per book?
In this case, they would both be the same:
...ANSWER
Answered 2021-Jun-08 at 18:14I am using BaseX v.9.5.2
XQuery
QUESTION
I was assigned to work with ten year old legacy Java project which generates the following artifacts.
...ANSWER
Answered 2021-Jun-04 at 06:57I don't know the EAR artifact and Java, but as per Docker Docs, the ADD
command can extract .tar.gz
files but not .ear
file format, so I think it's better to have a Dockerfile
like this (see here for extract):
QUESTION
I just received a helpful answer to a question about xml->tabular transformation, but I don't understand how to apply it to a document where an element may have several child nodes with the same tag.
As a minimal example, consider the books.xml
file at the W3Schools web site.
ANSWER
Answered 2021-Jun-07 at 03:16If you want a row for each author, then create a row for each author:
XSLT 1.0
QUESTION
I get a java.lang.NullPointerException when I compile my code and I don't know why. It says:
...ANSWER
Answered 2021-Jun-04 at 18:26In your Store
class the goods array is not initialized. It will work if you change it to
QUESTION
I am trying to start a basic project structure where multiple spring boot application will share resources using apache curator.
I am following the guides specified in documentation but changing the nodes doesnt trigger any events
Please, any help would be appreciated
pom.xml
...ANSWER
Answered 2021-May-09 at 20:09So yeah that class name PathChildrenCache was a dead giveaway. It sounded strange https://www.youtube.com/watch?v=nZcRU0Op5P4
if i am publishing to /path1/path2
and i am listening to path /path1/path2
am i actually listening to path1
or path2
?
Spoiler alert: You are listening to path2
which is a folder and not node you think you created
Solution is If producer produces on specified path
QUESTION
I want to add a custom Jsp tag to Spring boot. But I can't figure out project structure/URI for the taglib definition
I tried searching for solutions, but they are too ... deprecated. Using web.xml stuff, or really old folder structure which spring boot doesn't support by default.
While trying to load jsp page o get this error
org.apache.jasper.JasperException: Unable to find taglib [ex] for URI: [/customTags.tld]
This is my current folder structure
...ANSWER
Answered 2021-Apr-27 at 20:50So project structure was good. The reason why it couldnt find taglib is that uri is not a filepath its a domain (you can make it up)
in tld file add this http://whatever.jstldomainexample
custom.tld
QUESTION
I am getting a value error when adding the book to the cart. It points to for loop in views.py for orders. I am not able to figure a way to solve it. Any help is appreciated.
bookstore-django/store/views.py", line 68, in cart for order in orders:
Exception Type: ValueError at /cart/
Exception Value: The QuerySet value for an exact lookup must be limited to one result using slicing.
models.py
...ANSWER
Answered 2021-Apr-27 at 02:02Your problem is here:
QUESTION
I am attempting to expand the Bookstore example by introducing an other ViewModel to have Sections within the book store. I my case I am calling it 'Library'. I am having difficulty in getting the books added to display in a second ListView. In MainPage in addition to the MainViewModel (which now displays the sections) I have added SubModelView to return the current Section. In my Xaml code I have constructed a second ListView with the code to display the books but it is not working. Can anybody advise what I am doing incorrectly. I have included a SubModelView in MainPage to access the current Section in which the books are being created and used this in the Xaml code.
...ANSWER
Answered 2021-Mar-02 at 07:53Based on your description and code, I assume that you want to add a layer called Section to your Library app. Input a Section name and add multiple books into the added Section with TextBox controls and Button controls. If you have any concerns about the following code, please feel free to contact us.
Here is a sample code for you:
Book.idl
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