Add support for "unsigned" numeric fields

[longsleep]

Hi, I just gave this project a try to generate DB models for an existing database. The database uses unsigned integers on may columns. Those get typed (for example) as i32 where it should be u32.

I came accross https://github.com/Wulf/dsync/blob/12979e00998635291ecaf721cf6bc4282d9808ee/src/parser.rs (but there is no panic, or message visible when running dsync.

The resulting problem is, that all models fail to derive Insertable and AsChangeset.

trait bound `i32: diesel::Expression` is not satisfied

For example this table

diesel::table! {
    aliases (id) {
        id -> Unsigned<Integer>,
        aliasname -> Varchar,
        mainname -> Varchar,
    }
}

yields with dsync:

#[derive(Debug, Serialize, Deserialize, Clone, Queryable, Insertable, AsChangeset, Identifiable)]
#[diesel(table_name=aliases, primary_key(id))]
pub struct Aliase {
    pub id: i32,
    pub aliasname: String,
    pub mainname: String,
}

And with https://github.com/abbychau/diesel_cli_ext (where it works):

#[derive(Debug, Serialize, Deserialize, Clone, Queryable, Insertable, AsChangeset, Identifiable)]
#[diesel(table_name = aliases)]
pub struct Aliase {
    pub id: u32,
    pub aliasname: String,
    pub mainname: String,
}

[Wulf]

hey @longsleep, hope things are well -- thanks for your request and showing examples. Sorry it took so long to get this out.

0.0.10 should have this fixed :-)

[Wulf]

Closing, feel free to reopen if you encounter any issues!