arel 0.0.2

simulate rails arel
Documentation 
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use serde_json::{Value as Json};
use std::marker::PhantomData;
use crate::traits::ModelAble;
use crate::statements::StatementAble;
use crate::nodes::SqlLiteral;
use crate::methods;

#[derive(Clone, Debug)]
pub struct Update<M: ModelAble> {
    value: Json,
    _marker: PhantomData<M>,
}

impl<M> StatementAble<M> for Update<M> where M: ModelAble {
    fn json_value(&self) -> Option<&Json> {
        Some(&self.value)
    }
    fn to_sql_literals(&self) -> Vec<SqlLiteral> {
        let mut vec = vec![];
        if let Some(json_value) = self.json_value() {
            match json_value {
                Json::Object(json_object) => {
                    for column_name in json_object.keys() {
                        let table_column_name = methods::table_column_name::<M>(column_name);
                        let json_value = json_object.get(column_name).unwrap();
                        vec.push(SqlLiteral::new(format!("{} = {}", table_column_name, self.json_value_sql(json_value))));
                    }
                },
                _ => vec.append(&mut StatementAble::to_sql_literals_default(self))
            }
        }
        // Ok(vec.join(", "))
        vec
    }
    fn to_sql(&self) -> String {
        self.to_sql_with_concat(", ")
    }
}

impl<M> Update<M> where M: ModelAble {
    pub fn new(value: Json) -> Self {
        Self {
            value,
            _marker: PhantomData,
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use serde_json::{json};
    #[test]
    fn to_sql() {
        #[derive(Clone, Debug)]
        struct User {}
        impl ModelAble for User {}

        let update = Update::<User>::new(json!({
            "name": "Tome",
            "age": 18,
            "active": true,
            "profile": null
        }));
        assert_eq!(update.to_sql(), "`users`.`active` = 1, `users`.`age` = 18, `users`.`name` = 'Tome', `users`.`profile` = null");

        let update = Update::<User>::new(json!("users.active = 1"));
        assert_eq!(update.to_sql(), "users.active = 1");

        let update = Update::<User>::new(json!(["users.active = ?", 1]));
        assert_eq!(update.to_sql(), "users.active = 1");
    }
}