问题:我需要根据组织集合的选择来过滤单位集合。
选择组织后,单位下拉菜单应刷新以仅显示属于已知组织的单位。
我检查了以下问题:
这些文档:
到目前为止,这是我的代码:
楷模
class Organization < ActiveRecord::Base
has_many :units
has_many :projects, through: :units
end
class Unit < ActiveRecord::Base
belongs_to :organization
has_many :projects
end
class Project < ActiveRecord::Base
belongs_to :organizaton
has_one :organization, through: :unit
end
查看 app / views / projects / _form.html.erb
<%= form_for(@project) do |f| %>
<div class="field">
<%= f.label :name %><br>
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :description %><br>
<%= f.text_area :description %>
</div>
<div class="field">
<%= f.label :organization_id %><br>
<%= f.collection_select :organization_id, Organization.all, :id, :name %>
</div>
<div class="field">
<%= f.label :unit_id %><br>
<%= f.collection_select :unit_id, Unit.all.where(organization_id: :organization_id), :id, :name %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
控制器 项目控制器
def new
@project = Project.new
end
def project_params
params.require(:project).permit(:name, :description, :organization_id, :unit_id)
end
我该如何进行这项工作?
我做到了,解决方案非常简单,但是由于缺少有关此简单问题的更新资料,因此使它比应做的事情繁琐得多:
config / routes.rb
get 'filter_units_by_organization' => 'projects#filter_units_by_organization'
controllers / projects_controller.rb
def filter_units_by_organization
@filtered_units = Unit.where(organization_id: params[:selected_organization])
end
视图/项目/filter_units_by_organization.js.erb
$('select#project_unit_id').html('<%= j options_from_collection_for_select(@filtered_units, :id, :name) %>');
资产/javascripts/application.js
$(function() {
$("select#project_organization_id").on("change", function() {
$.ajax({
url: "/filter_units_by_organization",
type: "GET",
data: { selected_organization: $("select#project_organization_id").val() }
});
});
});
views / projects / _form.html.erb
<div class="field">
<%= f.label :name %><br>
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :description %><br>
<%= f.text_area :description %>
</div>
<div class="field">
<%= f.label :organization_id %><br>
<%= f.collection_select :organization_id, Organization.all, :id, :name, { prompt: 'Please select' } %>
</div>
<div class="field">
<%= f.label :unit_id %><br>
<%= f.collection_select :unit_id, Unit.all.where(organization_id: :organization_id), :id, :name %>
</div>
<div class="actions">
<%= f.submit %>
</div>
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