[英]ruby on rails web app controller generates error
I am following along a video series, where the author is creating a simple CMS using RoR 4, but I currently have RoR 3.x installed. 我正在观看一个视频系列,作者在其中使用RoR 4创建了一个简单的CMS,但是我目前安装了RoR3.x。 I followed all the code to a "T" but when I try to create a simple subject in the simple CMS, I am getting an error.
我将所有代码都跟在了“ T”后面,但是当我尝试在简单的CMS中创建一个简单的主题时,出现了错误。 So I checked the log/production.log
所以我检查了log / production.log
And I am getting the following error, TypeError (no implicit conversion of Symbol into String):
我收到以下错误,
TypeError (no implicit conversion of Symbol into String):
The controller code looks like the following, 控制器代码如下所示:
def create
# Instantiate a new object using form parameters
# the below line should work with rails v3.x
# @subject = Subject.new(params[:subject])
@subject = Subject.new(subject_params)
# Save the object
if @subject.save
# add flash hash
flash[:notice] = "Subject created successfully."
# if save succeeds, redirect to the index action
redirect_to(:action => 'index')
else
# if save fails, redisplay the form so user can fix problems
render('new')
end
end
And the private method I created for the subject new params looks like the following 我为主题新参数创建的私有方法如下所示
private
def subject_params
# same as using "params[:subject]", except that it:
# - raises an error if :subject is not present
# - allows listed attributes to be mass-assigned
params.require(:subject).permit(:name, :position, :visible)
end
The author tells you that you need to change @subject = Subject.new(subject_params)
to @subject = Subject.new(params[:subject])
. 作者告诉您,您需要将
@subject = Subject.new(subject_params)
更改为@subject = Subject.new(params[:subject])
。
params.require(:subject).permit(:name, :position, :visible)
is a Rails 4 feature called Strong Parameters . params.require(:subject).permit(:name, :position, :visible)
是Rails 4的一个功能,称为Strong Parameters 。 If you are new to Rails I would suggest you use the version the author uses to alleviate future version issues like this. 如果您不熟悉Rails,建议您使用作者使用的版本来缓解此类将来的版本问题。
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