entity scaffold

app/controllers/entities_controller.rb

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+class EntitiesController < ApplicationController
+  before_action :set_entity, only: %i[ show edit update destroy ]
+
+  # GET /entities
+  def index
+    @entities = Entity.all
+  end
+
+  # GET /entities/1
+  def show
+  end
+
+  # GET /entities/new
+  def new
+    @entity = Entity.new
+  end
+
+  # GET /entities/1/edit
+  def edit
+  end
+
+  # POST /entities
+  def create
+    @entity = Entity.new(entity_params)
+
+    if @entity.save
+      redirect_to @entity, notice: "Entity was successfully created."
+    else
+      render :new, status: :unprocessable_entity
+    end
+  end
+
+  # PATCH/PUT /entities/1
+  def update
+    if @entity.update(entity_params)
+      redirect_to @entity, notice: "Entity was successfully updated."
+    else
+      render :edit, status: :unprocessable_entity
+    end
+  end
+
+  # DELETE /entities/1
+  def destroy
+    @entity.destroy
+    redirect_to entities_url, notice: "Entity was successfully destroyed."
+  end
+
+  private
+    # Use callbacks to share common setup or constraints between actions.
+    def set_entity
+      @entity = Entity.find(params[:id])
+    end
+
+    # Only allow a list of trusted parameters through.
+    def entity_params
+      params.require(:entity).permit(:name, :ha_id, :type , :member_id)
+    end
+end

app/helpers/entities_helper.rb

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+module EntitiesHelper
+end

app/models/entity.rb

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+class Entity < ApplicationRecord
+  validate :name  , presence: true
+  validate :ha_id , presence: true
+  validate :type  , presence: true
+  validate :member_id  , presence: true
+
+end

app/views/entities/_form.html.haml

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+= form_for @entity do |f|
+  - if @entity.errors.any?
+    #error_explanation
+      %h2= "#{pluralize(@entity.errors.count, "error")} prohibited this entity from being saved:"
+      %ul
+        - @entity.errors.full_messages.each do |message|
+          %li= message
+
+  .field
+    = f.label :name
+    = f.text_field :name
+  .field
+    = f.label :ha_id
+    = f.text_field :ha_id
+  .field
+    = f.label :type
+    = f.text_field :type
+  .actions
+    = f.submit 'Save'

app/views/entities/edit.html.haml

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+%h1 Editing entity
+
+= render 'form'
+
+= link_to 'Show', @entity
+\|
+= link_to 'Back', entities_path

app/views/entities/index.html.haml

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+%h1 Listing entities
+
+%table
+  %thead
+    %tr
+      %th Name
+      %th Ha
+      %th Type
+      %th
+      %th
+      %th
+
+  %tbody
+    - @entities.each do |entity|
+      %tr
+        %td= entity.name
+        %td= entity.ha_id
+        %td= entity.type
+        %td= link_to 'Show', entity
+        %td= link_to 'Edit', edit_entity_path(entity)
+        %td= link_to 'Destroy', entity, method: :delete, data: { confirm: 'Are you sure?' }
+
+%br
+
+= link_to 'New Entity', new_entity_path

app/views/entities/new.html.haml

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+%h1 New entity
+
+= render 'form'
+
+= link_to 'Back', entities_path

app/views/entities/show.html.haml

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+%p#notice= notice
+
+%p
+  %b Name:
+  = @entity.name
+%p
+  %b Ha:
+  = @entity.ha_id
+%p
+  %b Type:
+  = @entity.type
+
+= link_to 'Edit', edit_entity_path(@entity)
+\|
+= link_to 'Back', entities_path