* Improve documentation

* add has_collection test
* fix white spaces

.gitignore

@@ -2,5 +2,6 @@ target
 Cargo.lock
 mongoc-sys/mongo-c-driver*
 ssl_env_vars
+
 .idea/
 .DS_Store

src/cursor.rs

@@ -257,6 +257,15 @@ impl<'a> Iterator for TailingCursor<'a> {
 type DocArray = VecDeque<Document>;
 type CursorId = i64;
 
+/// BatchCursor let's you iterate though batches of results
+/// in a natural way without having to deal parsing each block
+/// of 100 results from mongo.
+///
+/// Specifically, this cursor hides the complexity of having to call
+/// https://docs.mongodb.com/manual/reference/command/getMore/.  This
+/// allows you to have much cleaner user code.  Only commands which
+/// return batches work with this cursor.  For example, find, aggregate,
+/// and listIndexes all return batches.
 pub struct BatchCursor<'a> {
     cursor:     Cursor<'a>,
     db:         &'a Database<'a>,
@@ -281,6 +290,8 @@ impl<'a> BatchCursor<'a> {
         }
     }
 
+    // internal function to reach the next batch of results from the mongo cursor
+    // and store them in the DocArray buffer
     fn get_cursor_next(&mut self) -> Option<Result<Document>> {
         let item_opt = self.cursor.next();
         if let Some(item_res) = item_opt {
@@ -299,6 +310,8 @@ impl<'a> BatchCursor<'a> {
         None
     }
 
+    // internal function for pulling the next document from the documents buffer.
+    // this is the in memory representation of the documents we receive from each batch (DocArray)
     fn get_next_doc(&mut self) -> Option<Result<Document>> {
         if let Some(ref mut docs) = self.documents {
             if docs.len() > 0 {
@@ -344,7 +357,6 @@ impl<'a> Iterator for BatchCursor<'a> {
     type Item = Result<Document>;
 
     fn next(&mut self) -> Option<Self::Item> {
-
         // (1) try the local document buffer
         let res = self.get_next_doc();
         if res.is_some() {return res;}
@@ -368,6 +380,4 @@ impl<'a> Iterator for BatchCursor<'a> {
         }
         None
     }
-
-
 }

src/database.rs

@@ -26,7 +26,6 @@ pub enum CreatedBy<'a> {
     OwnedClient(Client<'a>)
 }
 
-#[doc(hidden)]
 fn get_coll_name_from_doc(doc: &Document) -> Result<String> {
     const VALID_COMMANDS: &'static [&'static str] = &["find", "aggregate", "listIndexes"];
     for s in VALID_COMMANDS {
@@ -60,8 +59,8 @@ impl<'a> Database<'a> {
 
     /// Execute a command on the database.
     /// This is performed lazily and therefore requires calling `next` on the resulting cursor.
-    /// Results are returned in batches as per the mongoc driver.
+    /// if your are using a command like find or aggregate `command_batch` is likely
-    /// To get the next batch: https://docs.mongodb.com/manual/reference/command/getMore/
+    /// more convenient for you.
     pub fn command(
         &'a self,
         command: Document,
@@ -103,7 +102,7 @@ impl<'a> Database<'a> {
         ))
     }
 
-    /// Execute a command on the database.
+    /// Execute a command on the database and returns a `BatchCursor`
     /// Automates the process of getting the next batch from getMore
     /// and parses the batch so only the result documents are returned.
     /// I am unsure of the best practices of when to use this or the CRUD function.
@@ -221,7 +220,7 @@ impl<'a> Database<'a> {
         String::from_utf8_lossy(cstr.to_bytes())
     }
 
-    /// Create a new collection in this database.
+    /// This function checks to see if a collection exists on the MongoDB server within database.
     pub fn has_collection<S: Into<Vec<u8>>>(
         &self,
         name:    S

src/lib.rs

@@ -35,7 +35,6 @@ extern crate log;
 extern crate serde_derive;
 extern crate serde;
 
-
 use std::ffi::CStr;
 use std::ptr;
 use std::result;

tests/database.rs

@@ -54,3 +54,20 @@ fn test_create_collection() {
 
     assert_eq!("created_collection", collection.get_name().to_mut());
 }
+
+#[test]
+fn test_has_collection() {
+    let uri      = Uri::new("mongodb://localhost:27017/").unwrap();
+    let pool     = ClientPool::new(uri, None);
+    let client   = pool.pop();
+    let database = client.get_database("rust_test");
+    database.get_collection("created_collection").drop().unwrap_or(());
+
+    let collection = database.create_collection(
+        "created_collection",
+        None
+    ).unwrap();
+
+    assert_eq!("created_collection", collection.get_name().to_mut());
+    assert!(database.has_collection("created_collection").unwrap());
+}