RailsのAPIモードで簡単なCRUDをしてみる

bin/rails g scaffold Group name:string
bin/rails db:migrate

class GroupsController < ApplicationController
  before_action :set_group, only: %i[ show update destroy ]

  # GET /groups
  def index
    @groups = Group.all

    render json: @groups
  end

  # GET /groups/1
  def show
    render json: @group
  end

  # POST /groups
  def create
    @group = Group.new(group_params)

    if @group.save
      render json: @group, status: :created, location: @group
    else
      render json: @group.errors, status: :unprocessable_entity
    end
  end

  # PATCH/PUT /groups/1
  def update
    puts group_params
    if @group.update(group_params)
      render json: @group
    else
      render json: @group.errors, status: :unprocessable_entity
    end
  end

  # DELETE /groups/1
  def destroy
    @group.destroy!
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_group
      @group = Group.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def group_params
      params.require(:group).permit(:name)
    end
end

$ curl  http://localhost:3000/groups | jq .
[
  {
    "id": 2,
    "name": "たなかたろう",
    "created_at": "2023-12-16T05:01:22.990Z",
    "updated_at": "2023-12-16T05:14:01.628Z"
  },
  {
    "id": 3,
    "name": "John Doe",
    "created_at": "2023-12-16T05:01:35.993Z",
    "updated_at": "2023-12-16T05:01:35.993Z"
  },
  {
    "id": 4,
    "name": "さとうたけし",
    "created_at": "2023-12-16T05:14:55.602Z",
    "updated_at": "2023-12-16T05:14:55.602Z"
  }
]

# 作成
curl -X POST -H 'Content-Type: application/json' -d '{"group":{"name": "さとうたけし"}}'  http://localhost:3000/groups  | jq .

{
  "id": 5,
  "name": "さとうたけし",
  "created_at": "2023-12-16T05:20:42.419Z",
  "updated_at": "2023-12-16T05:20:42.419Z"
}
# 更新
curl -X PUT -H 'Content-Type: application/json' -d '{"group":{"name": "たなかたろう"}}'  http://localhost:3000/groups/2  | jq .
{
  "name": "たなかたろう",
  "id": 2,
  "created_at": "2023-12-16T05:01:22.990Z",
  "updated_at": "2023-12-16T05:14:01.628Z"
}
# 削除
curl -X DELETE http://localhost:3000/groups/1