Question

在我的RoR应用程序中，我试图在视图上显示关联表的信息。

我的表格包含以下数据：

Email
id      subject
1       This week's work
2       Presentation
3       Spreadsheets

Recipients
email_id       group_id
1              2
2              2
3              1
1              3

Groups
id        name
1         Managers
2         Employees
3         Directors

Contactgroups
group_id        contact_id
1               1
2               1
1               3
3               2

Contacts
id          email
1           Gary
2           Dave
3           Annie

我要做的是显示已发送电子邮件的组列表以及每个组成员。例如，电子邮件1＆＃34;本周的工作＆＃34;被送到第1组＆＃34;经理＆＃34;和3＆＃34;董事＆＃34;，＆＃34;经理＆＃34;小组由联系人Gary和Annie以及＆＃34; Directors＆＃34;小组由联系人＆＃34; Dave＆＃34;组成。因此，在show.html.erb页面上，我想显示电子邮件的详细信息以及发送给它们的群组以及每个联系人。

为了做到这一点，在show.html.erb页面上我有代码：

<p>
  <strong>Groups Sent To:</strong></br>
  <% @recipients.each do |recipient| %>
        <%= recipient.group.name %>
        <% for i in 0..count_group_members(recipient.group.id)-1 do %>
            <%= group_member_name(recipient.group.id, i) %>
        <% end %></br>
  <% end %>
</p>

在我的emails_controller我有代码：

class EmailsController < ApplicationController
    helper_method :count_group_members, :group_member_name
    def index
        @useraccounts = Useraccount.where(user_id: session[:user_id])
        accountsarray = [0]
        @useraccounts.each do |f|
            accountsarray << f.account_id
        end
        # find all emails where the account_id is in the array - and so belongs to the user
        @emails = Email.where(account_id: [accountsarray])
    end
    def show
        @email = Email.find(params[:id])
        @account = Account.find_by_id(@email.account_id)
        @recipients = Recipient.where(email_id: @email.id)
    end
    def new
        @email = Email.new
        @email.recipients.build
        @useraccounts = Useraccount.where(user_id: session[:user_id])
    end
    def edit
        @email = Email.find(params[:id])
        @useraccounts = Useraccount.where(user_id: session[:user_id])
    end
    def create
        @email = Email.new(email_params)
        if @email.save
            redirect_to @email
        else
            render 'new'
        end
    end
    def update
        @email = Email.find(params[:id])
        if @email.update(email_params)
            redirect_to @email
        else
            render 'edit'
        end
    end
    def destroy
        @email = Email.find(params[:id])
        @email.destroy
        redirect_to emails_path
    end
    def count_group_members(group)
        Contactgroup.where(group_id: group).count
    end
    def group_member_name(group, i)
        contact = Contactgroup.where(group_id: group).offset(i).pluck(:contact_id)
        Contact.where(id: contact).pluck(:firstname)
    end
    private
    def email_params
        params.require(:email).permit(:subject, :message, :account_id, { contact_ids: [] }, { group_ids: [] })
    end
end

问题在于，在show.html.erb视图中，用户可以看到如下信息：

发送给的群组：

经理[＆＃34; Gary＆＃34;，＆＃34; Annie＆＃34;] [＆＃34; Annie＆＃34;]

导演[＆＃34; Dave＆＃34;]

当我想要显示为：

发送给的群组：

经理Gary，Annie

导演戴夫

有人可以帮帮我吗？

Answer 1

我需要做的就是更改控制器中的以下行：

def group_member_name(group, i)
    contact = Contactgroup.where(group_id: group).offset(i).pluck(:contact_id)
    Contact.find_by_id(contact).firstname
end

Ruby on Rails：使用函数从模型

1 个答案: