不幸的是这个工程:ROR比较中的ActiveRecord - 更新 [英] Unfortunately this works: ROR Comparison in Activerecord - update
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问题描述
不幸的是这个烂摊子的工作原理:你有suggestings清理这个code:我想用一个ActiveRecord的比较两个表列,需要和量,然后更新一个布尔值列,这取决于返回的数据。完全打破这样做,不重复的编码。
Unfortunately this mess works: Do you have suggestings for cleaning up this code: I'm trying to use a activerecord to compare two table columns, "needed" and "amount" then update a boolean column, depending on the returned data. Totally breaking do-not-repeat coding.
def update
@inventory = Inventory.find(params[:id])
respond_to do |format|
if @inventory.update_attributes(params[:inventory])
unless @inventory.needed.nil?
if @inventory.needed < @inventory.amount then
@inventory.instock = true
@inventory.update_attributes(params[:inventory])
else
@inventory.instock = false
@inventory.update_attributes(params[:inventory])
end
end
flash[:notice] = 'Inventory was successfully updated.'
format.html { redirect_to(@inventory) }
format.xml { head :ok }
else
format.html { render :action => "edit" }
format.xml { render :xml => @inventory.errors, :status => :unprocessable_entity }
end
end
end
干杯!
推荐答案
首先,保持外部逻辑移出控制器:
First, keep the extraneous logic out of your controller:
def update
@inventory = Inventory.find(params[:id])
respond_to do |format|
if @inventory.update_attributes(params[:inventory])
flash[:notice] = 'Inventory was successfully updated.'
format.html { redirect_to(@inventory) }
format.xml { head :ok }
else
format.html { render :action => "edit" }
format.xml { render :xml => @inventory.errors, :status => :unprocessable_entity }
end
end
end
然后,处理好与对库存模型回调的属性的inStock。是这样的:
Then, handle the instock attribute with a callback on the Inventory model. Something like:
before_update :check_instock, :unless => Proc.new { |inventory| inventory.needed.nil? }
def check_instock
if needed < amount
instock = true
else
instock = false
end
end
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