options_for_select on simple_form

Question

我可能是不正确地使用它，我无法理解它。

我正在simple_form上使用一个simple_form。它呈现得很好，没有错误，但是所选的选项没有保存到数据库中。所有其他字段都不存在任何问题。

select_tag是

<%= select_tag :experiment_type, options_for_select(['AOV', 'Conversion']), :prompt => "Select a Project Type" %>  

主计长：

class ExperimentsController < ApplicationController
    before_action :find_advertiser
    before_action :find_experiment, only: [:edit, :update, :show, :destroy]


    def index
        @experiments = Experiment.all.order("created_at DESC")
    end

    def show

    end

    def new
        @experiment = Experiment.new
        @advertisers = Advertiser.all.map{ |c| [c.name, c.id] }

    end

    def create
        @experiment = Experiment.new(experiment_params)
        @experiment.advertiser_id = params[:advertiser_id]   

        if @experiment.save
             redirect_to advertiser_path(@advertiser)
        else
            render 'new'
        end
    end

    def edit
            @projects = Project.all.map{ |c| [c.name, c.id] }
    end

    def update
        @experiment.advertiser_id = params[:id]     
        if @experiment.update(experiment_params)
            redirect_to experiment_path(@experiment)
        else
            render 'edit'
        end
    end

    def destroy
        @experiment.destroy
        redirect_to root_path
    end

private

    def experiment_params
        params.require(:experiment).permit(:advertiser_id, :name, :experiment_type, :hypothesis, :priority, :status, :launch_date, 
            :description, :baseline_url, :test_url, :baseline_aov_60, :baseline_aov_30, :baseline_aov_mtd,
            :baseline_conversion_60, :baseline_conversion_30, :baseline_conversion_mtd)
    end

    def find_advertiser
        @advertiser = Advertiser.find(params[:advertiser_id])
    end

    def find_experiment
        @experiment = Experiment.find(params[:id])
    end
end

Answer 1

我需要您的完整表单布局来确定地告诉您，但是根据您的experiment_params方法，experiment_type字段是实验的一部分。但是，当您只使用select_tag时，它不会连接到您的主对象。您只需要使用select。与此类似：

<%= simple_form_for :experiment do |f| %>
...
<%= f.select ... %>
...
<% end %>

或者在表格格式中

<%= f.input :experiment_type, collection: ['AOV', 'Conversion'] %>

我的猜测也是基于您的散列：

"experiment_type"=>"AOV"，“=>”=>{“=>”测试.

experiment_type在你的“实验”之外。