我的应用程序适用于 api json 请求和常规 html。我的路由器.ex
defmodule MyApp.Router do
use MyApp.Web, :router
pipeline :browser do
plug :accepts, ["html"]
plug :fetch_session
plug :fetch_flash
plug :protect_from_forgery
plug :put_secure_browser_headers
end
pipeline :api do
plug :accepts, ["json"]
end
scope "/api", MyApp do
pipe_through :api # Use the default browser stack
scope "/v1", V1, as: :v1 do
resources "/users", UserController, except: [:new, :edit, :index]
end
end
scope "/", MyApp do
pipe_through :browser # Use the default browser stack
get "/confirm/:token", UserController, :confirm, as: :user_confirm
end
end …在我的ecto模型中，我需要在字段中指定：user_timestamp从unix_time转换的时间。移民：
def change do
alter table(:operations) do
add :user_timestamp, :naive_datetime, null: false
end
end
我的operation.ex
schema "operations" do
field :sum, :float
field :name, :string
field :user_timestamp, :naive_datetime
timestamps()
end
def changeset(struct, params \\ %{}) do
struct
|> cast(params, [:name, :sum, :user_timestamp])
|> validate_required([:sum, :user_timestamp])
|> convert_unix_time_to_ecto
end
defp convert_unix_time_to_ecto(changeset) do
put_change(changeset, :user_timestamp, Ecto.DateTime.from_unix!(changeset.changes.user_timestamp, :seconds) |> Ecto.DateTime.to_naive())
end
但是，当我尝试添加具有user_timestamp的要求时，出现错误：
[error] #PID<0.492.0> running MyApp.Endpoint terminated
Server: localhost:4000 (http)
Request: POST /api/v1/operations
** (exit) an exception was raised:
** (FunctionClauseError) no function clause …在Phoenix应用程序中，我有一个函数可以获取两个地图，并通过Ecto.Changeset在数据库中创建两个条目。
def create_user_with_data(user_attrs, data_attrs) do
name = cond do
data_attrs["name"] ->
data_attrs["name"]
data_attrs[:name] ->
data_attrs[:name]
true -> nil
end
Ecto.Multi.new()
|> Ecto.Multi.insert(:user, User.registration_changeset(%User{}, Map.put(user_attrs, :name, name)))
|> Ecto.Multi.run(:user_data, fn(%{user: user}) ->
%MyApp.Account.UserData{}
|> MyApp.Account.UserData.changeset(Map.put(data_attrs, :user_id, user.id))
|> Repo.insert()
end)
|> Repo.transaction()
end
因为这些图中的键既可以是原子也可以是线，所以我必须检查这些键。
但是表达
Map.put(user_attrs, :name, name)
会导致错误
** (Ecto.CastError) expected params to be a map with atoms or string keys, got a map with mixed keys: %{:name => "John", "email" => "m@gmail.com"}
如果键是字符串。
处理此问题是否有最佳实践？
我已经安装了 mysql workbench v. 8.0.13，并且正在尝试运行迁移工具，但出现错误：
Could not import the pyodbc python module. You need pyodbc 2.1.8 or newer for migrations from RDBMSes other than MySQL.
我已经安装了pyodbc：
Python 3.7.0 (default, Sep 28 2018, 16:44:32)
[GCC 8.2.1 20180831] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyodbc
>>> pyodbc.version
'4.0.24'
我该如何解决这个问题？
OS: Linux my-pc 4.19.0-3-MANJARO #1 SMP PREEMPT Sat Oct 27 22:40:22 UTC 2018 x86_64 GNU/Linux
有两种模型：资源和元数据：
defmodule Myapp.Repo.Migrations.CreateResources do
use Ecto.Migration
def change do
create table(:resources) do
add :name, :string
add :parent_id, references(:resources, on_delete: :delete_all)
timestamps
end
create index(:resources, [:parent_id])
end
end
defmodule Myapp.Repo.Migrations.CreateMetadata do
use Ecto.Migration
def change do
create table(:metadata) do
add :size, :integer
add :resource_id, references(:resources)
timestamps
end
create index(:metadata, [:resource_id])
end
end
schema "resources" do
field :name, :string
belongs_to :parent, Myapp.Resource
has_one :metadata, Myapp.Metadata, on_delete: :delete_all
has_many :childs, Myapp.Resource, foreign_key: :parent_id, on_delete: :delete_all
timestamps()
end
schema "metadata" do
field :size, :integer …我有一个vuetify组件来显示标签列表.
<template>
<div>
<v-chip
v-for="tag in tags"
:key="tag.id"
v-model="???"
@input="onClose(tag)"
close
>
{{tag.name}}
</v-chip>
</div>
</template>
<script>
export default {
name: 'TagIndex',
props: ['tags'],
methods: {
onClose(tag){
console.log('close tag')
}
}
}
</script>
vuetify文档说:
可以使用v模型控制可闭合的芯片.
如果标签列表是动态的,我不明白我需要指定哪种对象作为每个标签的模型.
我试图根据标签列表创建一个数组:
data(){
return {
clonedTags: this.tags.map((t) => {return true})
}
}
但是失败了
在我的凤凰控制器中，我使用：
...
def delete(conn, %{"id" => id}) do
post = Repo.get!(Post, id)
with {:ok, %{post: %Post{}}} <- Posts.delete_post(post) do
send_resp(conn, :no_content, "")
end
end
...
在我的测试中：
...
test "deletes chosen post", %{conn: orig_conn, user: user, post: post} do
conn = delete orig_conn, v1_post_path(orig_conn, :delete, post)
assert response(conn, 204)
conn = delete orig_conn, v1_post_path(orig_conn, :delete, post)
assert response(conn, 404)
end
...
但是，如果帖子不存在，则此测试将失败：
...
** (Ecto.NoResultsError) expected at least one result but got none in query:
...
为什么？我看到这个，Ecto.NoResultsError应该返回404状态
Phoenix版本1.3，phoenix-ecto 3.3，ecto …