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aiprompts/builderparadigm.md

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+
+
+please refactor each of the objects in the the chosen folder to use builder paradigm, see below for an example
+we always start from root object, each file e.g. product.rs corresponds to a root object, the rootobject is what is stored in the DB, the rest are sub objects which are children of the root object
+
+---
+
+### ✅ Step 1: Define your struct
+```rust
+#[derive(Debug)]
+pub enum ProductType {
+    Service,
+    // Other variants...
+}
+
+#[derive(Debug)]
+pub enum ProductStatus {
+    Available,
+    Unavailable,
+    // Other variants...
+}
+
+#[derive(Debug)]
+pub struct Product {
+    id: u32,
+    name: String,
+    description: String,
+    price: f64,
+    product_type: ProductType,
+    category: String,
+    status: ProductStatus,
+    max_amount: u32,
+    validity_days: u32,
+}
+```
+
+---
+
+### ✅ Step 2: Create a builder
+
+```rust
+pub struct ProductBuilder {
+    id: Option<u32>,
+    name: Option<String>,
+    description: Option<String>,
+    price: Option<f64>,
+    product_type: Option<ProductType>,
+    category: Option<String>,
+    status: Option<ProductStatus>,
+    max_amount: Option<u32>,
+    validity_days: Option<u32>,
+}
+
+impl ProductBuilder {
+    pub fn new() -> Self {
+        Self {
+            id: None,
+            name: None,
+            description: None,
+            price: None,
+            product_type: None,
+            category: None,
+            status: None,
+            max_amount: None,
+            validity_days: None,
+        }
+    }
+
+    pub fn id(mut self, id: u32) -> Self {
+        self.id = Some(id);
+        self
+    }
+
+    pub fn name<S: Into<String>>(mut self, name: S) -> Self {
+        self.name = Some(name.into());
+        self
+    }
+
+    pub fn description<S: Into<String>>(mut self, description: S) -> Self {
+        self.description = Some(description.into());
+        self
+    }
+
+    pub fn price(mut self, price: f64) -> Self {
+        self.price = Some(price);
+        self
+    }
+
+    pub fn product_type(mut self, product_type: ProductType) -> Self {
+        self.product_type = Some(product_type);
+        self
+    }
+
+    pub fn category<S: Into<String>>(mut self, category: S) -> Self {
+        self.category = Some(category.into());
+        self
+    }
+
+    pub fn status(mut self, status: ProductStatus) -> Self {
+        self.status = Some(status);
+        self
+    }
+
+    pub fn max_amount(mut self, max_amount: u32) -> Self {
+        self.max_amount = Some(max_amount);
+        self
+    }
+
+    pub fn validity_days(mut self, validity_days: u32) -> Self {
+        self.validity_days = Some(validity_days);
+        self
+    }
+
+    pub fn build(self) -> Result<Product, &'static str> {
+        Ok(Product {
+            id: self.id.ok_or("id is required")?,
+            name: self.name.ok_or("name is required")?,
+            description: self.description.ok_or("description is required")?,
+            price: self.price.ok_or("price is required")?,
+            product_type: self.product_type.ok_or("type is required")?,
+            category: self.category.ok_or("category is required")?,
+            status: self.status.ok_or("status is required")?,
+            max_amount: self.max_amount.ok_or("max_amount is required")?,
+            validity_days: self.validity_days.ok_or("validity_days is required")?,
+        })
+    }
+}
+```
+
+---
+
+### ✅ Step 3: Use it like this
+
+```rust
+let product = ProductBuilder::new()
+    .id(1)
+    .name("Premium Service")
+    .description("Our premium service offering")
+    .price(99.99)
+    .product_type(ProductType::Service)
+    .category("Services")
+    .status(ProductStatus::Available)
+    .max_amount(100)
+    .validity_days(30)
+    .build()
+    .expect("Failed to build product");
+```
+
+---
+
+This way:
+- You don’t need to remember the order of parameters.
+- You get readable, self-documenting code.
+- It’s easier to provide defaults or optional values if you want later.
+
+Want help generating this automatically via a macro or just want it shorter? I can show you a derive macro to do that too.