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问题 <%= file_field 'upload' %> In my controller, if I give the following, based on suggestions filename=params[:upload] @result=filename.original_filename I am getting. undefined method `original_filename' for #<ActionController::Parameters:0x002b6c396e44b8> Note: I am not using form. Rails version is 4.0.2 回答1: Use the following code in order to get the filename: params[:file].original_filename 回答2: Have you read how to upload files in Rails? Have you set your form to multipart: true ? What will

问题 I am working on an io-ts validation where I would like to validate the list length (it has to be between min and max). I am wondering if there's a way to achieve this behavior since it could come quite handy at runtime for API endpoint validation. What I have so far is interface IMinMaxArray { readonly minMaxArray: unique symbol // use `unique symbol` here to ensure uniqueness across modules / packages } const minMaxArray = (min: number, max: number) => t.brand( t.array, (n: Array): n is t

问题 In Python, if I wanted to do a check for all items from yesterday would I do something like: from datetime import datetime, timedelta if datetime.datetime.today() - timedelta(days=2) < item_to_check < datetime.datetime.today(): Would this pull all items from yesterday and is this the best way to do it? 回答1: I'd try something easier ;-) from datetime import date, timedelta yesterday = date.today() - timedelta(days=1) if item_to_check.date() == yesterday: # yup! Note that your: item_to_check <

问题 I am trying to implement a twitter login button in a fragment in Android using Fabric. I got it to work in an activity, but cannot get it working in a fragment. Here is my TwitterFragment class (extends fragment) @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { TwitterAuthConfig authConfig = new TwitterAuthConfig(mTWITTER_KEY, mTWITTER_SECRET); Fabric.with(super.getActivity(), new Twitter(authConfig)); View view = inflater.inflate(R

问题 I am getting this following exception when I try configuring micronaut-data with inmemory h2 database and Jpa. I have been following the documentation I created the project from command line with maven as build tool. I have the following <dependency> <groupId>io.micronaut.configuration</groupId> <artifactId>micronaut-jdbc-tomcat</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>com.h2database</groupId> <artifactId>h2</artifactId> <scope>runtime</scope> </dependency>

问题 I have a discriminated union, for example: type Union = { a: "foo", b: string, c: number } | {a: "bar", b: boolean } I need to derive a type that includes all potential properties, assigned with types that may be found on any member of Union , even if only defined on some - in my example: type CollapsedUnion = { a: "foo" | "bar", b: string | boolean, c: number | undefined } How can I make a generic that derives such collapsed unions? I need a generic that supports unions of any size. Similar

问题 In current Angular 6 application there is a subscribe to observable (response from RESTful service) this.activatedRoute.data.subscribe(({bag}) => { console.log(bag); this.bag= bag; }); the subscription is waiting response from resolver @Injectable({ providedIn: 'root' }) export class BagResolver implements Resolve<Bag> { constructor(private service: BagService) {} resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot) { const id = route.params['id'] ? route.params['id'] : null; if

问题 I have an application running in C#.Netcore and C++ windows application. I achieved interoperability between C# & C++ using SWIG. But I am not able to achieve Callback functionality from C++ to C#. Also I tried by passing function pointer from C# to C++. But it also failed My Intention is to achieve callback by By passing a C# function pointer to C++ and call that function pointer when needed so that C# function will be executed. Creating a base class with virtual function in C++ and derive a

问题 I want to split my 300 lines build.gradle logically into multiple build files to make it easier to maintain and extend. As I've noticed, it is possible to split gradle tasks into multiple files and use them with: apply from: "myGradleFile" With this approach I sadly have no access to functions , defined in the second build script. Is it also possible to split Gradle functions into multiple files? Example: Let's say I have my default build.gradle with a Task which uses a function task

问题 I have a discriminated union, for example: type Union = { a: "foo", b: string, c: number } | {a: "bar", b: boolean } I need to derive a type that includes all potential properties, assigned with types that may be found on any member of Union , even if only defined on some - in my example: type CollapsedUnion = { a: "foo" | "bar", b: string | boolean, c: number | undefined } How can I make a generic that derives such collapsed unions? I need a generic that supports unions of any size. Similar