mongodb 0.9.1

The official MongoDB driver for Rust (currently in alpha)
Documentation 
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#[cfg(test)]
mod test;

use bson::{bson, doc, Document};

use crate::{
    cmap::{Command, CommandResponse, StreamDescription},
    coll::Namespace,
    collation::Collation,
    error::{convert_bulk_errors, Result},
    operation::{append_options, Operation, WriteResponseBody},
    options::DeleteOptions,
    results::DeleteResult,
};

#[derive(Debug)]
pub(crate) struct Delete {
    ns: Namespace,
    filter: Document,
    limit: u32,
    options: Option<DeleteOptions>,
    collation: Option<Collation>,
}

impl Delete {
    #[cfg(test)]
    fn empty() -> Self {
        Self::new(
            Namespace {
                db: String::new(),
                coll: String::new(),
            },
            Document::new(),
            None,
            None,
        )
    }

    pub(crate) fn new(
        ns: Namespace,
        filter: Document,
        limit: Option<u32>,
        mut options: Option<DeleteOptions>,
    ) -> Self {
        Self {
            ns,
            filter,
            limit: limit.unwrap_or(0), // 0 = no limit
            collation: options.as_mut().and_then(|opts| opts.collation.take()),
            options,
        }
    }
}

impl Operation for Delete {
    type O = DeleteResult;
    const NAME: &'static str = "delete";

    fn build(&self, description: &StreamDescription) -> Result<Command> {
        let mut delete = doc! {
            "q": self.filter.clone(),
            "limit": self.limit,
        };

        if let Some(ref collation) = self.collation {
            delete.insert("collation", bson::to_bson(&collation)?);
        }

        let mut body = doc! {
            Self::NAME: self.ns.coll.clone(),
            "deletes": [delete],
            "ordered": true, // command monitoring tests expect this (SPEC-1130)
        };
        append_options(&mut body, self.options.as_ref())?;

        Ok(Command::new(
            Self::NAME.to_string(),
            self.ns.db.clone(),
            body,
        ))
    }

    fn handle_response(&self, response: CommandResponse) -> Result<Self::O> {
        let body: WriteResponseBody = response.body()?;
        body.validate().map_err(convert_bulk_errors)?;

        Ok(DeleteResult {
            deleted_count: body.n,
        })
    }
}