Gorilla/Mux Reverse mapping URL

[Farhad Kocharli]

I’m new in development. Now trying to learn gorilla/mux router. The question is about reversed urls. In gorilla/mux I know we name them with .Name() method and access with .Url(). Could someone explain real use case of reserved URL’s(Reverse mapping URL)? But a few hours of googling didn’t help me to find any info about that why we even need them? Will be really thankfull if you could show some practical examples.

[Matt S]

Could you expand on this? Not sure what you mean?

On Sat, Jun 13, 2020 at 3:34 AM Farhad Kocharli <kocharl...@gmail.com> wrote:

I’m new in development. Now trying to learn gorilla/mux router. The question is about reversed urls. In gorilla/mux I know we name them with .Name() method and access with .Url(). Could someone explain real use case of reserved URL’s(Reverse mapping URL)? But a few hours of googling didn’t help me to find any info about that why we even need them? Will be really thankfull if you could show some practical examples.

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[Farhad Kocharli]

well. let me explain. below section is from mux documentation, could someone explain what is this? why we need this? and in which real example we use this?

Now let's see how to build registered URLs.

Routes can be named. All routes that define a name can have their URLs built, or "reversed". We define a name calling Name() on a route. For example:

r := mux.NewRouter()
r.HandleFunc("/articles/{category}/{id:[0-9]+}", ArticleHandler).
  Name("article")

To build a URL, get the route and call the URL() method, passing a sequence of key/value pairs for the route variables. For the previous route, we would do:

url, err := r.Get("article").URL("category", "technology", "id", "42")

...and the result will be a url.URL with the following path:

"/articles/technology/42"

On Saturday, June 13, 2020 at 6:23:32 PM UTC+4, Matt S wrote:

Could you expand on this? Not sure what you mean?

On Sat, Jun 13, 2020 at 3:34 AM Farhad Kocharli <kocharl...@gmail.com> wrote:

I’m new in development. Now trying to learn gorilla/mux router. The question is about reversed urls. In gorilla/mux I know we name them with .Name() method and access with .Url(). Could someone explain real use case of reserved URL’s(Reverse mapping URL)? But a few hours of googling didn’t help me to find any info about that why we even need them? Will be really thankfull if you could show some practical examples.

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[Matt S]

You would use this when:

• Constructing redirects to send to a client - eg programmatically, so you don’t have to fix the URLs in your code elsewhere

• Building examples & tests 

• Generating docs 

 

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[Farhad Kocharli]

Thanks a lot. I though that this is something easy but couldn't figure out in my head how to use it. Now, thanks to you I have clear picture of usage.  Thanks again, I really appreciate your efforts to help.

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