ormlitex-macro 0.17.1

An ORM for people who love SQL. Use the `ormlitex` crate, not this one.
Documentation 
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use proc_macro2::TokenStream;
use quote::quote;
use syn::DeriveInput;
use ormlitex_attr::{Ident, ModelMetadata, TableMetadata};
use crate::codegen::common::{insertion_binding, ormlitexCodegen};
use crate::codegen::insert::impl_ModelBuilder__insert;
use crate::codegen::update::impl_ModelBuilder__update;
use crate::MetadataCache;


pub fn struct_ModelBuilder(ast: &DeriveInput, attr: &ModelMetadata) -> TokenStream {
    let model = &attr.inner.struct_name;
    let model_builder = attr.builder_struct();
    let vis = &ast.vis;

    let settable = attr.database_columns().map(|c| {
        let name = &c.identifier;
        let ty = &c.column_type;
        quote! { #name: std::option::Option<#ty> }
    });

    let methods = attr.database_columns().map(|c| {
        let name = &c.identifier;
        let ty = &c.column_type;
        if ty.is_string() {
            quote! {
                pub fn #name<T: Into<String>>(mut self, #name: T) -> Self {
                    self.#name = Some(#name.into());
                    self
                }
            }
        } else {
            quote! {
                pub fn #name(mut self, #name: #ty) -> Self {
                    self.#name = Some(#name);
                    self
                }
            }
        }
    });

    let build_modified_fields = attr.database_columns().map(|c| {
        let name = &c.identifier;
        let name_str = &c.column_name;
        quote! {
            if self.#name.is_some() {
                ret.push(#name_str);
            }
        }
    });

    let fields_none = attr.database_columns().map(|c| {
        let name = &c.identifier;
        quote! {
            #name: None
        }
    });

    quote! {
            #vis struct #model_builder<'a> {
                #(#settable,)*
                updating: Option<&'a #model>,
            }

            impl<'a> std::default::Default for #model_builder<'a> {
                fn default() -> Self {
                    Self {
                        #(#fields_none,)*
                        updating: None,
                    }
                }
            }

            impl<'a> #model_builder<'a> {
                #(#methods)*

                fn modified_fields(&self) -> Vec<&'static str> {
                    let mut ret = Vec::new();
                    #(#build_modified_fields)*
                    ret
                }
            }
        }
}

pub fn impl_ModelBuilder__build(attr: &TableMetadata) -> TokenStream {
    let unpack = attr.database_columns()
        .map(|c| {
            let c = &c.identifier;
            let msg = format!("Tried to build a model, but the field `{}` was not set.", c);
            quote! { let #c = self.#c.expect(#msg); }
        });

    let fields = attr.database_columns()
        .map(|c| &c.identifier);

    let skipped_fields = attr.columns.iter().filter(|&c| c.skip)
        .map(|c| {
            let id = &c.identifier;
            quote! {
                #id: Default::default()
            }
        });

    quote! {
        fn build(self) -> Self::Model {
            #( #unpack )*
            Self::Model {
                #( #fields, )*
                #( #skipped_fields, )*
            }
        }
    }
}


pub fn impl_ModelBuilder(db: &dyn ormlitexCodegen, attr: &ModelMetadata) -> TokenStream {
    let partial_model = attr.builder_struct();
    let model = &attr.struct_name();

    let impl_ModelBuilder__insert = impl_ModelBuilder__insert(db, &attr.inner);
    let impl_ModelBuilder__update = impl_ModelBuilder__update(db, attr);
    let impl_ModelBuilder__build = impl_ModelBuilder__build(&attr.inner);

    let db = db.database_ts();
    quote! {
        impl<'a> ::ormlitex::model::ModelBuilder<'a, #db> for #partial_model<'a> {
            type Model = #model;
            #impl_ModelBuilder__insert
            #impl_ModelBuilder__update
            #impl_ModelBuilder__build
        }
    }
}