Model skeleton

Set up the model by adding serde derive to the Post struct.

Blog project: the model

In this project we'll write a small tool that reads blog posts from a file, filters them and can be queried from the command line. In a real project posts are read from JSON with serde and commands parsed with clap; in the exercises we'll build the same steps with the standard library. The first step is the data model:

#[derive(Debug, Clone, Serialize, Deserialize)]
struct Yazi {
    id: u32,
    konu: String,
    yazar: String,
    etiketler: Vec<String>,
    yayinda: bool,
}

Clone is useful when filter results must be returned as independent copies.

Creating an instance

A short helper can be used for tests and sample data:

let y = Yazi {
    id: 1,
    konu: String::from("Rust ile başlangıç"),
    yazar: String::from("ece"),
    etiketler: vec![String::from("rust")],
    yayinda: true,
};
println!("{:?}", y);

The {:?} output shows the fields in declaration order; it's the fastest way to check the model while debugging.

Exercise Post model

Define the Yazi struct above with #[derive(Debug, Clone)]. Create a post with id: 1, "Rust ile başlangıç", "ece", ["rust"], true and print it with {:?}.

Show example solution

#[derive(Debug, Clone)]
struct Yazi {
    id: u32,
    konu: String,
    yazar: String,
    etiketler: Vec<String>,
    yayinda: bool,
}

fn main() {
    let y = Yazi {
        id: 1,
        konu: String::from("Rust ile başlangıç"),
        yazar: String::from("ece"),
        etiketler: vec![String::from("rust")],
        yayinda: true,
    };
    println!("{:?}", y);
}

Test yourself

Why was <code>Vec<String></code> chosen for the tags?
- A post can have zero or many tags and should own its data
- Tags are numbers
- A String can't hold one tag
- serde only reads Vec
Show answer

A post can have zero or many tags and should own its data — With Vec<&str>, the post would depend on the text living somewhere else.

Tags field

struct Yazi {
    id: u32,
    etiketler: ____,
}

Show answer

struct Yazi {
    id: u32,
    etiketler: Vec<String>,
}

Field and type

id

u32
konu

String
etiketler

Vec<String>
yayinda

bool

Next lesson: Reading JSON

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