使用MySQL數組Rails 4

我想改變我的「seeker_cvs」表列「location_id」。這是一個整數類型。現在我想把它作爲一個數組。（我被迫讓它沒有多對多的關聯）。所以我的模型是：使用MySQL數組Rails 4

class SeekerCv < ActiveRecord::Base 

    belongs_to :location, class_name: 'Category' 
    serialize :location_id, Array 

end

類別有很多seeker_cvs。

另外我已經添加和運行新的遷移：

class ChangeLocationIdOnSeekerCvs < ActiveRecord::Migration 
    def change 
    change_column :seeker_cvs, :location_id, :integer, array: true, default: [] 
    end 
end

在seekers_cvs控制器我在許可變更「LOCATION_ID」到「LOCATION_ID：[]」：

class SeekerCvsController < ApplicationController 

    def new 
    @cv = SeekerCv.new 
    end 

    def create 
    @cv = SeekerCv.new(cv_params) 
    @cv.seeker = current_seeker 
    if @cv.save 
     redirect_to seeker_cv_path(@cv) 
    else 
     render :new 
    end 
    end 

    def edit 
    @cv = SeekerCv.find(params[:id]) 
    authorize @cv 
    end 

    def update 
    @cv = SeekerCv.find(params[:id]) 
    @cv.attributes = cv_params 
    if @cv.save 
     redirect_to seeker_cv_path(@cv) 
    else 
     render :edit 
    end 
    end 

    private 

    def cv_params 
    params.require(:seeker_cv).permit :name, 
             :category_id, 
             :no_experience, 
             location_id: [] 
    end 
end

鑑於我加入multiple: true形成：

= simple_form_for @cv, html: { class: 'form-horizontal' } do |f| 
    .panel.panel-default 
    .panel-heading 
     h3.panel-title = t('.cv_name') 
    .panel-body#cv-category 
     = f.input :name 
     = f.input :category_id do 
     = f.select :category_id, 
      nested_set_options_opt_mod(Category.category.root.children.to_a) { |i| "#{'-' * i.level} #{i.name}" }, 
      { disabled: Category.category.find_all { |l| !l.leaf? }.map(&:id), include_blank: true }, 
      { class: 'form-control' } 
     = f.input :location_id do 
     = f.select :location_id, 
      nested_set_options_opt(Category.location.root) { |i| "#{'-' * i.level} #{i.name}" }, 
      { disabled: Category.location.root.id, include_blank: true }, 
      { multiple: true, class: 'form-control' }

但是當我triing創建或更新seeker_cv （見圖片），我得到：

ActiveRecord::SerializationTypeMismatch at /app/en/seeker_cvs 
Attribute was supposed to be a Array, but was a Fixnum. -- 0

附：我需要保持以前創建的seeker_cvs與整數類型的location_id。新的或更新必須有陣列類型的列

來源

2017-04-20 Serhii Fedorchuk

我認爲列的類型必須是一個VARCHAR，因爲MySQL不具備原生數組類型。 – Iceman

'change_column：seeker_cvs，：location_id，：string' – Iceman

冰人，謝謝！您的解決方案很好。現在我已經將我的列更改爲數組類型 –

問題是mysql沒有本地數組類型。所以，你必須使用varchar作爲列類型

change_column :seeker_cvs, :location_id, :string

來源

2017-04-20 18:13:10 Iceman

使用MySQL數組Rails 4

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