20250730-elixir-phx-blog-api

mix phx.new blog_api --database mysql --no-html --no-assets --no-dashboard

config :blog_api, BlogApi.Repo,
username: "your_mysql_user",
password: "your_mysql_password",
database: "blog_api_dev",
hostname: "localhost",
port: 3306,
show_sensitive_data_on_connection_error: true,
pool_size: 10

cd blog_api
mix deps.get
mix ecto.create
mix ecto.migrate

# 用户资源
mix phx.gen.json Accounts User users username:string password_hash:string

# 文章资源
mix phx.gen.json Content Article articles title:string content:text user_id:references:users

# 评论资源
mix phx.gen.json Content Comment comments content:text article_id:references:articles user_id:references:users

scope "/api", BlogApiWeb do
pipe_through :api

resources "/users", UserController, except: [:new, :edit]
resources "/articles", ArticleController, except: [:new, :edit]
resources "/comments", CommentController, except: [:new, :edit]
end

defmodule BlogApi.Accounts.User do
use Ecto.Schema
import Ecto.Changeset

schema "users" do
field :username, :string
field :password_hash, :string
field :password, :string, virtual: true

has_many :articles, BlogApi.Content.Article
has_many :comments, BlogApi.Content.Comment

timestamps()
end

def changeset(user, attrs) do
user
            |> cast(attrs, [:username, :password])
            |> validate_required([:username, :password])
            |> unique_constraint(:username)
            |> put_password_hash()
            end

            defp put_password_hash(%Ecto.Changeset{valid?: true, changes: %{password: password}} = changeset) do
            change(changeset, password_hash: Bcrypt.hash_pwd_salt(password))
            end
            defp put_password_hash(changeset), do: changeset
            end

mix phx.server

# 创建用户
curl -X POST http://localhost:4000/api/users \
     -H "Content-Type: application/json" \
     -d '{"user": {"username": "test", "password": "secret"}}'

# 创建文章
curl -X POST http://localhost:4000/api/articles \
     -H "Content-Type: application/json" \
     -d '{"article": {"title": "Phoenix API", "content": "Building JSON APIs", "user_id": 1}}'

blog_api/
├── lib/
│   ├── blog_api/
│   │   ├── accounts/     # 用户领域
│   │   ├── content/      # 文章和评论领域
│   ├── blog_api_web/
│   │   ├── controllers/  # 纯JSON控制器
│   │   ├── views/        # JSON视图
└── config/
└── dev.exs           # MySQL配置