我在尝试将新条目保存到数据库时遇到问题。在提交时，项目应保存到项目表中，该项目中的技术/技术将保存到关系表中。
更新代码在经过多次更改后已更新
继承我的新动作：
def new
@project = Project.new
@technol = Technol.new(params[:tech])
@all_technols = Technol.all
tech_ids = params[:technols][:id].reject(&:blank?) unless params[:technols].nil?
@project_technol = @project.projecttechnols.build
#@project_technol = Projecttechnol.new
respond_to do |format|
format.html # new.html.erb
format.json { render json: @project }
end
end
创建操作：
def create
@all_technols = Technol.all
@project = Project.new(params[:project])
@technol = Technol.new(params[:tech])
params[:technol].each_value do |tech|
technology = Technol.find_by_tech(tech.strip)
@project_technol = @project.projecttechnols.build(:technol_id => technology.id)
end
@project.client = params[:new_client] unless params[:new_client].blank?
@project.project_owner = params[:new_project_owner] unless params[:new_project_owner].blank?
@project.tech = params[:new_tech] unless params[:new_tech].blank?
@project.role = params[:new_role] unless params[:new_role].blank?
@project.industry = params[:new_industry] unless params[:new_industry].blank?
@project.business_div = params[:new_business_div] unless params[:new_business_div].blank?
respond_to do |format|
if @project.save
format.html { redirect_to @project, notice: 'Project was successfully created.' }
format.json { render json: @project, status: :created, location: @project }
else
format.html { render action: "new" }
format.json { render json: @project.errors, status: :unprocessable_entity }
end
end
end
我的3个模特：
Project.rb
class Project < ActiveRecord::Base
attr_accessible :edited_first_name, :edited_last_name, :first_name, :last_name, :business_div, :client, :customer_benifits, :edited_date, :end_date, :entry_date, :financials, :industry, :keywords, :lessons_learned, :project_name, :project_owner, :role, :start_date, :status, :summary, :tech , :technols
validates_presence_of :business_div, :client, :customer_benifits, :end_date, :financials, :industry, :keywords, :lessons_learned, :project_name, :project_owner, :role, :start_date, :status, :summary
has_many :projecttechnols
has_many :technols, :through => :projecttechnols
def self.like(text); "%#{text}%"; end
def self.search(search_client, search_industry, search_role, search_techs_ids, search_business_div, search_project_owner, search_status, search_start_date_dd, search_start_date_A, search_start_date_B, search_keywords)
# start with a scoped query, to apply more scopes on it afterwards
_projects = Project.scoped
# then, for each of the parameters, apply the scope only if present
if search_client.present?
_projects = _projects.where ['client LIKE ?', like(search_client)]
end
if search_industry.present?
_projects = _projects.where ['industry LIKE ?', like(search_industry)]
end
if search_role.present?
_projects = _projects.where ['role LIKE ?', like(search_role)]
end
#_projects = _projects.joins(:technols).
# where("technols.id" => search_techs_ids)
#_projects = _projects.joins(:projecttechnols).where("projecttechnols.id" => search_techs_ids)
if search_techs_ids.present?
_projects = _projects.joins(:technols).where("technols.id" => search_techs_ids)
end
if search_business_div.present?
_projects = _projects.where ['business_div LIKE ?', like(search_business_div)]
end
if search_project_owner.present?
_projects = _projects.where ['project_owner LIKE ?', like(search_project_owner)]
end
if search_status.present?
_projects = _projects.where ['status LIKE ?', like(search_status)]
end
todays_date = DateTime.now.to_date
if !search_start_date_A.blank? or !search_start_date_B.blank?
search_start_date_A = Date.parse(search_start_date_A).strftime("%Y-%m-%d")
search_start_date_B = Date.parse(search_start_date_B).strftime("%Y-%m-%d")
todays_date = nil
search_start_date_dd = nil
end
if search_start_date_dd.blank?
todays_date = nil
end
if search_start_date_A.present? or search_start_date_B.present?
_projects = _projects.where [' DATE(start_date) BETWEEN ? AND ?', search_start_date_A, search_start_date_B]
end
if search_start_date_dd.present?
_projects = _projects.where ['DATE(start_date) BETWEEN ? AND ?', search_start_date_dd, todays_date]
end
if search_keywords.present?
_projects = _projects.where ['keywords LIKE ?', like(search_keywords)]
end
# now you have applied only the present scopes. return the result, and watch
# the query as it executes.
_projects
end
def self.paginated_for_index(projects_per_page, current_page)
paginate(:per_page => projects_per_page, :page => current_page)
end
end
technol.rb
class Technol < ActiveRecord::Base
attr_accessible :tech
has_many :projecttechnols
has_many :projects, :through => :projecttechnols
end
projecttechnol.rb
class Projecttechnol < ActiveRecord::Base
attr_accessible :project_id, :technol_id
belongs_to :technol
belongs_to :project
end
这是新视图的一部分，我认为这会导致问题：
<div class="tech">
<% common_techs = [['Mainframe'],['UNIX'],['Windows Servers'],['Networking'],['CISCO'], ['Win7'], ['Telephony'], ['Web services'], ['Website'], ['Cloud'], ['Virtualisation'], ['Data Centre']] %>
<% db_techs = Technol.all.map {|p| [p.tech]}.uniq %>
<% all_tech = common_techs + db_techs %>
<%= form_for(@technol) do |tech| %>
<div class="field">
<%= tech.label :tech %><br />
<%= tech.text_field :tech %>
</div>
<%end%>
当我点击提交按钮创建一个新项目时，我收到此错误：
RuntimeError in ProjectsController#create
Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id
app/controllers/projects_controller.rb:116:in `block in create'
app/controllers/projects_controller.rb:112:in `each_value'
app/controllers/projects_controller.rb:112:in `create'
这些是我的参数：
{"utf8"=>"✓",
"authenticity_token"=>"sPyJbgBKTxa9iHWF9r0Gg/0R/v0l0/e8KwXpPebzdus=",
"project"=>{"project_name"=>"",
"status"=>"Active",
"client"=>"",
"business_div"=>"",
"project_owner"=>"",
"start_date"=>"01-10-2012",
"entry_date"=>"2012-10-03",
"end_date"=>"09-10-2012",
"role"=>"",
"industry"=>"",
"summary"=>"",
"lessons_learned"=>"",
"customer_benifits"=>"",
"financials"=>"",
"keywords"=>""},
"new_client"=>"",
"new_business_div"=>"",
"new_project_owner"=>"",
"technol"=>{"tech"=>"TESTER"},
"new_role"=>"",
"new_industry"=>"",
"commit"=>"Save New Project"}
答案 0 :(得分：3)
这是因为您在params[:technols]返回的哈希中查找键“id”的值。但是，当您查看该哈希{"tech"=>"Web services"}时，只有一个键是“tech”。因此，当您尝试params[:technol][:id]时，您基本上会得到一个零对象。