新增：数据集部分接口

app/controllers/api/v1/projects/datasets_controller.rb

@@ -0,0 +1,38 @@
+class Api::V1::Projects::DatasetsController < Api::V1::BaseController
+  before_action :require_public_and_member_above
+  before_action :find_dataset, only: [:update, :show]
+
+  def create 
+    return render_error('该项目下已存在数据集！') if @project.project_dataset.present?
+    @project_dataset = ProjectDataset.new(dataset_params.merge!(project_id: @project.id))
+    if @project_dataset.save! 
+      render_ok
+    else 
+      render_error('创建数据集失败！')
+    end
+  end
+
+  def update 
+    @project_dataset.attributes = dataset_params
+    if @project_dataset.save! 
+      render_ok
+    else
+      render_error("更新数据集失败！")
+    end
+  end
+
+  def show 
+    @attachments = @project_dataset.attachments.includes(:author)
+  end
+
+  private 
+  def dataset_params 
+    params.permit(:title, :description)
+  end
+
+  def find_dataset 
+    @project_dataset = @project.project_dataset 
+    return render_not_found unless @project_dataset.present?
+  end
+
+end