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How can you create a non-empty CharField in Django?

I have a simple model which looks like this: class Group(models.Model): name = models.CharField(max_length = 100, ... /6940499/how-can-you-create-a-non-empty-charfield-in-django...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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373 views

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sql - DISTINCT ON in an aggregate function in postgres

For my problem, we have a schema whereby one photo has many tags and also many comments. So if I have a ... .com/questions/30077639/distinct-on-in-an-aggregate-function-in-postgres...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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292 views

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dart - Flutter - How does it work behind the scenes?

Obviously, flutter is a framework for running apps on iOS and Android using one codebase. But how does it manage ... /questions/43854647/flutter-how-does-it-work-behind-the-scenes...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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379 views

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How do I connect my python spyder with github?

Is there any way to connect python spyder with github? I manage my R scripts via github, because R provides ... questions/42239874/how-do-i-connect-my-python-spyder-with-github...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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507 views

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reactjs - Using a forwardRef component with children in TypeScript

Using @types/react 16.8.2 and TypeScript 3.3.1. I lifted this forward refs example straight from ... /questions/54654303/using-a-forwardref-component-with-children-in-typescript...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

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get - Servlet and path parameters like /xyz/{value}/test, how to map in web.xml?

Does servlet support urls as follows: /xyz/{value}/test where value could be replaced by text or number. How to map ... -path-parameters-like-xyz-value-test-how-to-map-in-web-xml...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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294 views

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How to use a specific tag/version with composer and a private git repository?

I've got some packages host on the Gitlab of my company. I want to request a specific version of these ... -a-specific-tag-version-with-composer-and-a-private-git-repository...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How to detect if a string contains special characters?

How to detect if a string contains special characters like #,$,^,&,*,@,! etc (non-alphanumeric ... questions/2558755/how-to-detect-if-a-string-contains-special-characters...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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powershell - Using git with ssh-agent on Windows

I'm on Windows. I installed git and posh-git (some helpers for Windows PowerShell). I can add keys with ... stackoverflow.com/questions/34638462/using-git-with-ssh-agent-on-windows...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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347 views

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postgresql - Is there a "pg_restore --quiet" option like "psql --quiet"?

psql has a -q / --quiet option (environment variable QUIET). pg_restore does not have a quiet option. Is there ... /11485358/is-there-a-pg-restore-quiet-option-like-psql-quiet...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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600 views

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aggregation framework - How to flatten a subdocument into root level in MongoDB?

For example, if I have a document like this { a: 1, subdoc: { b: 2, c: 3 } } How can I ... .com/questions/22903849/how-to-flatten-a-subdocument-into-root-level-in-mongodb...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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84 views

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Associative Array SCSS/SASS

I need to convert numbers into words, so: "1-3" -> "one-third" "3-3" -> "three-thirds" " ... question from:https://stackoverflow.com/questions/21344891/associative-array-scss-sass...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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176 views

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Freeze panes in Excel using C# and EPPlus

I want to freeze first 5 columns and three rows in excel. I have written the following code for that ... questions/28061319/freeze-panes-in-excel-using-c-sharp-and-epplus...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How does SELECT from two tables separated by a comma work? (SELECT * FROM T1, T2)

Given 2 tables T1 and T2. T1 T2 --------- A 1 B 2 C 3 You make a query: SELECT * FROM T1, T2 What ... /how-does-select-from-two-tables-separated-by-a-comma-work-select-from-t1-t2...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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250 views

1 answer

javascript - Enum as @param type in JSDoc

Is it possible to use an enum for the JSDoc @param type declaration like in the following example? /** * ... ://stackoverflow.com/questions/21702556/enum-as-param-type-in-jsdoc...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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772 views

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python - Why is my plt.savefig is not working?

I have a simple python code as follows: import numpy as np import matplotlib.pyplot as plt """ Here are the ... .com/questions/30765455/why-is-my-plt-savefig-is-not-working...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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417 views

1 answer

xcode11 - Consume Swift Package for multiple targets and platforms in a project?

I have a project with multiple targets, such as an iOS app, a watchOS app, and some frameworks. How can I ... /consume-swift-package-for-multiple-targets-and-platforms-in-a-project...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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434 views

1 answer

oracle10g - Oracle Date - How to add years to date

I have a date field DATE = 10/10/2010 sum = 4 (this are number of years by calculation) is there a way ... /stackoverflow.com/questions/9313234/oracle-date-how-to-add-years-to-date...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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111 views

1 answer

How to copy a huge table data into another table in SQL Server

I have a table with 3.4 million rows. I want to copy this whole data into another table. I am performing this task ... -to-copy-a-huge-table-data-into-another-table-in-sql-server...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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252 views

1 answer

Angular start ngFor index from 1

Is it possible to start ngFor index from 1 instead of 0? let data of datas;let i=index+1 didn't ... https://stackoverflow.com/questions/39057119/angular-start-ngfor-index-from-1...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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319 views

1 answer

java - How to include system dependencies in war built using maven

I've searched on internet for quite some time and I'm unable to figure out how to configure the maven-war ... /19065666/how-to-include-system-dependencies-in-war-built-using-maven...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

1 answer

update dart sdk for flutter

I would like to use dart SDK >= 2.2.0 with flutter. But my current version used BY Flutter is 2.1 ... from:https://stackoverflow.com/questions/55898181/update-dart-sdk-for-flutter...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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189 views

1 answer

How to prevent the screen of an android device to turn off during the execution of an Activity?

I have an Activity that usually needs some time to watch the screen without interacting with it. The problem is ... screen-of-an-android-device-to-turn-off-during-the-execution...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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155 views

1 answer

how to write a process-pool bash shell

I have more than 10 tasks to execute, and the system restrict that there at most 4 tasks can run at the ... .com/questions/6441509/how-to-write-a-process-pool-bash-shell...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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216 views

1 answer

c# - Best way in .NET to manage queue of tasks on a separate (single) thread

I know that asynchronous programming has seen a lot of changes over the years. I'm somewhat embarrassed that I let ... -net-to-manage-queue-of-tasks-on-a-separate-single-thread...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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411 views

1 answer

Rails - Devise - Error messages when signing in?

How can I make f.error_messages work here, or should I use flashes? If so, what should override in ... .com/questions/4635986/rails-devise-error-messages-when-signing-in...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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112 views

1 answer

How can I get ack to ignore *.orig files?

I put this in my .ackrc: --type-set=DUMB=*.orig --noDUMB ... but I'm still seeing files like main.py ... /stackoverflow.com/questions/4748529/how-can-i-get-ack-to-ignore-orig-files...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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122 views

1 answer

c# - How to send DELETE with JSON to the REST API using HttpClient

I have to send a delete command to a REST API service with JSON content using the HttpClient class and can't make ... how-to-send-delete-with-json-to-the-rest-api-using-httpclient...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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