NameError in MicropostsController#searchを解決したい

お世話になっております。

現在、railsインスタグラムクローンアプリを開発しており、検索機能を実装しようとコードを書いているのですが、下記エラーが解決できず、困っております。uninitialized constantと表示されているのでroutes.rb、Controllerのファイル名、Controllerのクラス名を確認したのですが、間違いははありませんでした。

何卒よろしくお願いいたします。

エラーメッセージ

NameError in MicropostsController#search
uninitialized constant MicropostsController::Post
Extracted source (around line #25):
23  def search
24   #Viewのformで取得したパラメータをモデルに渡す
25   @posts = Post.search(params[:search])
26  end
27
28  private

routes.rb

Rails.application.routes.draw do
  root 'pages#top'
  get 'search', to: 'microposts#search', as: :search
  devise_for :users, controllers: { registrations: 'users/registrations', omniauth_callbacks: 'users/omniauth_callbacks',
  passwords: 'users/passwords'}
  resources :users do
    member do
      get :following, :followers
    end
  end
  resources :users,         only: [:show, :index, :destroy]
  resources :microposts,    only: [:create, :destroy]
  resources :relationships, only: [:create, :destroy]
  get  '/notification',       to:'pages#notification'
  get  '/post',               to:'pages#post'
end

_search.html.erb

<p>検索</p>
<%= form_tag(search_path,:method => 'get') do %>
  <%= text_field_tag :search %>
  <%= submit_tag 'Search', :content => nil %>
<% end %>

microposts_controller.rb

class MicropostsController < ApplicationController
  before_action :authenticate_user!, only: [:create, :destroy]
  before_action :correct_user,       only: :destroy

  def create
    @micropost = current_user.microposts.build(micropost_params)
    @micropost.image.attach(params[:micropost][:image])
    if @micropost.save
      flash[:success] = "Micropost created!"
      redirect_to root_url
    else
      @feed_items = current_user.feed.paginate(page: params[:page])
      render 'pages/top'
    end
  end

  def destroy
    @micropost.destroy
    flash[:success] = "Micropost deleted"
    redirect_to request.referrer || root_url
  end

  def search
    #Viewのformで取得したパラメータをモデルに渡す
    @posts = Post.search(params[:search])
  end

  private

    def micropost_params
      params.require(:micropost).permit(:content, :image)
    end

    def correct_user
      @micropost = current_user.microposts.find_by(id: params[:id])
      redirect_to root_url if @micropost.nil?
    end
end

micropost.rb

class Micropost < ApplicationRecord
  #mount_uploader :image, ImageUploader
  belongs_to :user
  has_one_attached :image
  default_scope -> { order(created_at: :desc) }
  validates :user_id, presence: true
  validates :content, presence: true, length: { maximum: 140 }
  validates :image,   content_type: { in: %w[image/jpeg image/gif image/png],
                                      message: "must be a valid image format" },
                      size:         { less_than: 5.megabytes,
                                      message: "should be less than 5MB" }

  # 表示用のリサイズ済み画像を返す
  def display_image
    image.variant(resize_to_limit: [500, 500])
  end

  def self.search(search)
    return Post.all unless search
    Post.where(['content LIKE ?', "%#{search}%"])
  end
end