distinct improvements and remove unnecessary structs (#80)

(cherry picked from commit 753da0a)

Author: rustagir

source/includes/usage-examples/code-snippets/count-async.rs

@@ -1,19 +1,13 @@
 use std::env;
-
 use mongodb::{ bson::doc, Client, Collection };
-use serde::{ Deserialize, Serialize };
-
-#[derive(Serialize, Deserialize, Debug)]
-struct Restaurant {
-    name: String,
-}
+use bson::Document;
 
 #[tokio::main]
 async fn main() -> mongodb::error::Result<()> {
     let uri = "<connection string>";
 
     let client = Client::with_uri_str(uri).await?;
-    let my_coll: Collection<Restaurant> = client
+    let my_coll: Collection<Document> = client
         .database("sample_restaurants")
         .collection("restaurants");
 

source/includes/usage-examples/code-snippets/count-sync.rs

@@ -1,18 +1,12 @@
 use std::env;
-
 use mongodb::{ bson::doc, sync::{ Client, Collection } };
-use serde::{ Deserialize, Serialize };
-
-#[derive(Serialize, Deserialize, Debug)]
-struct Restaurant {
-    name: String,
-}
+use bson::Document;
 
 fn main() -> mongodb::error::Result<()> {
     let uri = "<connection string>";
 
     let client = Client::with_uri_str(uri)?;
-    let my_coll: Collection<Restaurant> = client
+    let my_coll: Collection<Document> = client
         .database("sample_restaurants")
         .collection("restaurants");
 

source/includes/usage-examples/code-snippets/distinct-async.rs

@@ -1,20 +1,13 @@
 use std::env;
-
 use mongodb::{ bson::doc, Client, Collection };
-use serde::{ Deserialize, Serialize };
-
-#[derive(Serialize, Deserialize, Debug)]
-struct Restaurant {
-    borough: String,
-    cuisine: String,
-}
+use bson::Document;
 
 #[tokio::main]
 async fn main() -> mongodb::error::Result<()> {
     let uri = "<connection string>";
 
     let client = Client::with_uri_str(uri).await?;
-    let my_coll: Collection<Restaurant> = client
+    let my_coll: Collection<Document> = client
         .database("sample_restaurants")
         .collection("restaurants");
 

source/includes/usage-examples/code-snippets/distinct-sync.rs

@@ -1,19 +1,12 @@
 use std::env;
-
 use mongodb::{ bson::doc, sync::{ Client, Collection } };
-use serde::{ Deserialize, Serialize };
-
-#[derive(Serialize, Deserialize, Debug)]
-struct Restaurant {
-    borough: String,
-    cuisine: String,
-}
+use bson::Document;
 
 fn main() -> mongodb::error::Result<()> {
     let uri = "<connection string>";
 
     let client = Client::with_uri_str(uri)?;
-    let my_coll: Collection<Restaurant> = client
+    let my_coll: Collection<Document> = client
         .database("sample_restaurants")
         .collection("restaurants");
 

source/usage-examples/count.txt

@@ -27,9 +27,7 @@ Example
 -------
 
 This example counts documents in the ``restaurants`` collection of the
-``sample_restaurants`` database. The example uses a ``Restaurant``
-struct that has a ``name`` field to model the documents in the
-collection.
+``sample_restaurants`` database.
 
 The following code first uses the ``estimated_document_count()`` method
 to count the total number of documents in the collection. Then, the

source/usage-examples/distinct.txt

@@ -4,9 +4,11 @@
 List Distinct Field Values
 ==========================
 
-You can list the distinct field values of documents by calling the
-`distinct() <{+api+}/struct.Collection.html#method.distinct>`__ method
-on a ``Collection`` instance.
+You can list the distinct values of a document field in a collection by
+calling the `distinct() <{+api+}/struct.Collection.html#method.distinct>`__
+method on a ``Collection`` instance. For example, if documents in a
+collection contain the ``date`` field, you can use the ``distinct()``
+method to find all the possible values for that field in the collection.
 
 Pass a field name as a parameter to the ``distinct()`` method to return
 the distinct values for that field. You can also pass a query filter as
@@ -20,10 +22,8 @@ type, a vector of `Bson <{+bson-api+}/enum.Bson.html>`__ values.
 Example
 -------
 
-This example finds distinct field values across the
-``restaurants`` collection of the ``sample_restaurants`` database. The
-example uses a ``Restaurant`` struct that has ``cuisine`` and
-``borough`` fields to model documents in the collection.
+This example finds distinct values for a field in the
+``restaurants`` collection of the ``sample_restaurants`` database.
 
 The following code finds distinct values of the ``borough`` field in
 the subset of documents in which the value of the ``cuisine`` field