我试图从我之前关于凤凰城 RethinkDB 表的问题更进一步。
现在我正在尝试通过通道检索它们，以便实时显示对表的新插入。
我已经通过 handle_in 函数插入到表中：
def handle_in("new_person", %{"firstName" => firstName, "lastName" => lastName}, socket) do
broadcast! socket, "new_person", %{firstName: firstName, lastName: lastName}
table("users")
|> insert(%{first_name: firstName, last_name: lastName})
|> RethinkExample.Database.run
{:noreply, socket}
end
在 app.js 中：
dbInsert.on("click", event => { //Detect a click on the dbInsert div (to act as a button)
//Use a module from the channel to create a new person
chan.push("new_person", {firstName: firstName.val(), lastName: lastName.val()});
// Clear the fields once the push has been made
firstName.val("");
lastName.val("");
});
chan.join().receive("ok", chan => {
console.log("Ok");
});
我应该使用哪个函数来处理：
table("users")
|> RethinkExample.Database.run
如果现在是频道而不是 html，我应该如何渲染数据？我可以使用 HTML+Javascript 渲染插入的人，但我想要的是从数据库中检索新用户并使用我的其他表格结果实时渲染它。
以下是我在视觉上的表现：
users.html.eex
<div class="jumbotron">
<div id="userList">
<%= for %{"first_name" => first_name, "last_name" => last_name} <- @users.data do %>
<p><%= "#{first_name} #{last_name}" %>!</p>
<% end %>
</div>
</div>
<div class="dbOperation">
First name: <input type="text" id="firstName"><br>
Last name: <input type="text" id="lastName"><br>
<div id="dbInsert">Insert</div>
<br>
<div id="userToInsert">User to insert: </div>
</div>
user_controller.ex
defmodule RethinkExample.UsersController do
use RethinkExample.Web, :controller
use RethinkDB.Query
def users(conn, _params) do
# List all elements of a table from the database
q = table("users")
# Query for filtering results:
# |> filter(%{last_name: "Palmer"})
|> RethinkExample.Database.run #Run the query through the database
render conn, "users.html", users: q #Render users searched on the users template
end
end
people_channel.ex
defmodule RethinkExample.PeopleChannel do
use Phoenix.Channel
use RethinkDB.Query
#Handles the insert subtopic of people
def join("people:insert", auth_msg, socket) do
{:ok, socket}
end
# handles any other subtopic as the people ID, ie `"people:12"`, `"people:34"`
def join("people:" <> _private_room_id, _auth_msg, socket) do
{:error, %{reason: "unauthorized"}}
end
def handle_in("new_person", %{"firstName" => firstName, "lastName" => lastName}, socket) do
broadcast! socket, "new_person", %{firstName: firstName, lastName: lastName}
query = table("users")
|> insert(%{first_name: firstName, last_name: lastName})
|> RethinkExample.Database.run
new_person = %{"id": hd(query.data["generated_keys"]), "firstName": firstName, "lastName": lastName}
broadcast! socket, "new_person", new_person
{:noreply, socket}
end
def handle_out("new_person", payload, socket) do
push socket, "new_person", payload
{:noreply, socket}
end
end
应用程序.js
import {Socket} from "phoenix"
let App = {
}
export default App
// Fetch fields from HTML through Jquery
let firstName = $("#firstName")
let lastName = $("#lastName")
let dbInsert = $("#dbInsert")
let userToInsert = $("#userToInsert")
let userList = $("#userList")
let socket = new Socket("/ws") //Declare a new socket
socket.connect() //Connect to the created socket
let chan = socket.chan("people:insert", {}) //Assign the people insertion channel to the socket
dbInsert.on("click", event => { //Detect a click on the dbInsert div (to act as a button)
//Use a module from the channel to create a new person
chan.push("new_person", {firstName: firstName.val(), lastName: lastName.val()});
// Clear the fields once the push has been made
firstName.val("");
lastName.val("");
})
chan.on("new_person", payload => {
userToInsert.append(`<br/>[${Date()}] ${payload.firstName} ${payload.lastName}`);
console.log("New Person", payload);
userList.append(`<br><p> ${payload.firstName} ${payload.lastName}!</p>`);
})
chan.join().receive("ok", chan => {
console.log("Ok");
})