Java Community | Help. Code. Learn.•6mo ago

what the hell is model and why controller returns random string?

hey guys. can smb explain what the hell model is? bc i tried googling and its just vaguely said that model is your data. yes, i know its from MVC pattern, but it still doesnt make any sense, can smb explain what the f is going on here:

@GetMapping("/importBgwEod")
    public String importBgwEod(Model model) throws JAXBException, IOException {
        importService.importBgwEod(getUserId());
        model.addAttribute("status", "Success!!!");
        return "status";
    }

@GetMapping("/importBgwEod")
    public String importBgwEod(Model model) throws JAXBException, IOException {
        importService.importBgwEod(getUserId());
        model.addAttribute("status", "Success!!!");
        return "status";
    }

how can importBgwEod accept model argument, but its not requeired for the GET request? why this method is returning random string status? where do i get this needed model from? thx

28 Replies

JavaBot•6mo ago

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Unknown User•6mo ago

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bambyzasOP•6mo ago

but how can importBgwEod accept model argument, but its not requeired for the GET request?

Unknown User•6mo ago

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bambyzasOP•6mo ago

what thats not what i asked i asked about one thing, and u r talking about smth other than that

Unknown User•6mo ago

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bambyzasOP•6mo ago

what are you talking about sorry but i honestly dont understand ur point and what u mean

Rag...JN 🌌 🦡 👽 💰 🐊•6mo ago

do you have any option to call the "/importBgwEod"?

Peter Rader•6mo ago

how can importBgwEod accept model argument, but its not requeired for the GET request? The request arrives the spring framework in the first place. Then spring notice that the getmapped method requires a argument of type "Model" (most likely org.springframework.ui.Model). Spring now have a special logic for that. Spring creates a new, plain instance of Model. Spring put arguments from the session and from the request into that model and with that instance, the method importBgwEod is called. Now, the return-string is indicating what template should be filled and sent back to the browser.

Rag...JN 🌌 🦡 👽 💰 🐊•6mo ago

So the model is not an object that we can access a row of a table row?

Rag...JN 🌌 🦡 👽 💰 🐊•6mo ago

Rag...JN 🌌 🦡 👽 💰 🐊•6mo ago

and you access it like this

Peter Rader•6mo ago

At this moment only the OP knows what full-qualified-name the class Model has. It must be a type having the method "addAttribute". I am certain that the full-qualified-classname is org.springframework.ui.Model. Because: 1. The classname is the same 2. The method exists 3. The parameters match.

bambyzasOP•6mo ago

finally someone explained it to me. thanks alot!. so basically since im using MVC pattern, sprint automagically takes care of model?

JavaBot•6mo ago

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bambyzasOP•6mo ago

yeah, with postman

Rag...JN 🌌 🦡 👽 💰 🐊•6mo ago

So what is your Model's fully qualified name?

Rag...JN 🌌 🦡 👽 💰 🐊•6mo ago

I am just curious to know you can even pass an Entity like this

bambyzasOP•6mo ago

no idea. idk how/where to look

Rag...JN 🌌 🦡 👽 💰 🐊•6mo ago

on the top imports find the line what Model

Rag...JN 🌌 🦡 👽 💰 🐊•6mo ago

somewhere here

bambyzasOP•6mo ago

Rag...JN 🌌 🦡 👽 💰 🐊•6mo ago

good shit, now you can see search for it for futher details

Peter Rader•6mo ago

Heh, I knew it 😄

Rag...JN 🌌 🦡 👽 💰 🐊•6mo ago

so what do they mean by a place holder?

Rag...JN 🌌 🦡 👽 💰 🐊•6mo ago

hmm it's like a dynamic object hah

Peter Rader•6mo ago

Yea, placeholder is misleading. It is an dynamic-outgoing-value-wrapper to be used as an method-argument. Usually method arguments should consume data into the method. But this dynamic-object is primarily used for returning values. Usually a returning value is used with the return command of the method-result-type. Borgrel was absolutly correct that this is a not well written code! Since we have two result-values in that code (the attribute "status" and the template-view-name "status"), you better use the Return-Type return new ModelAndView(...);

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what the hell is model and why controller returns random string?