models 0.1.3

A migration management library for applications using PostgresSQL, MySQL or SQLite.
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use crate::prelude::*;
use models_parser::{dialect::*, parser::*};
#[derive(Clone, Debug, PartialEq)]
pub struct Column {
    pub name: Ident,
    pub r#type: DataType,
    pub options: Vec<ColumnOptionDef>,
}

impl Column {
    pub fn new(name: &str, r#type: DataType, is_nullable: bool) -> Self {
        let options;
        if !is_nullable {
            options = vec![ColumnOptionDef {
                name: None,
                option: ColumnOption::NotNull,
            }];
        } else {
            options = vec![]
        }

        Column {
            name: Ident::new(name.to_lowercase()),
            r#type,
            options,
        }
    }

    pub fn new_with_default(name: &str, r#type: DataType, is_nullable: bool, def: &str) -> Self {
        let dialect = GenericDialect {};
        let mut tokens = tokenizer::Tokenizer::new(&dialect, def);
        let mut parser = Parser::new(tokens.tokenize().unwrap(), &dialect);
        let expr = parser.parse_expr().unwrap();

        let mut col = Column {
            name: Ident::new(name.to_lowercase()),
            r#type,
            options: vec![ast::ColumnOptionDef {
                name: None,
                option: ast::ColumnOption::Default(expr),
            }],
        };
        if !is_nullable {
            col.options.push(ColumnOptionDef {
                name: None,
                option: ColumnOption::NotNull,
            });
        };
        col
    }

    pub fn has_default(&self) -> bool {
        for option in &self.options {
            if matches!(option.option, ColumnOption::Default(_)) {
                return true;
            }
        }
        false
    }

    pub fn is_nullable(&self) -> bool {
        for option in &self.options {
            if matches!(option.option, ColumnOption::NotNull) {
                return false;
            }
        }
        true
    }
}

impl From<ColumnDef> for Column {
    fn from(col: ColumnDef) -> Self {
        Column {
            name: col.name,
            options: col.options,
            r#type: col.data_type,
        }
    }
}

impl From<Column> for ColumnDef {
    fn from(col: Column) -> Self {
        ColumnDef {
            name: col.name,
            options: col.options,
            data_type: col.r#type,
            collation: None,
        }
    }
}