如何將額外的參數傳遞給控制器​​至控制器的as_json

Question

控制器中有兩個apis。我需要main_category的圖片和nav-category的圖標。我怎樣才能傳遞來自控制器的xtra參數，並且可以在模型中區分這個請求來自main_category並且這是來自nav_category。請幫忙。

def main_category 
    category = Category.all 
    render :json => :include => {:success=> true,:data => category.as_json(@a,:only => [:name,:image_url])} 

    end 

    def nav_category 
    category = Category.all 
    render :json => {:success=> true,:data => category.as_json(:only => [:name,:icon_url])} 
    end 

as_json模型是：

def as_json(options = { }) 
    if self.id == nil 
    category = self.category 
    elsif(@a=='main') 
    h = super(options) 
     h[:image_url]= "http://#{$request.try(:host_with_port)}#{self.image.url}" 

     h 
    else 
     h = super(options) 
     h[:image_url]= "http://#{$request.try(:host_with_port)}#{self.image.url}" 
     h[:icon_url]= "http://#{$request.try(:host_with_port)}#{self.icon.url}" 
     h 
    end 
end 

Answer 1

我想你需要的是將自定義選項as_json方法來區分它們的內容。

控制器：

def main_category 
    categories = Category.all 
    render :json => { 
    :success=> true, 
    :data => categories.as_json(:only => [:name,:image_url], :category => "main") 
    } 
end 

def nav_category 
    categories = Category.all 
    render :json => { 
    :success=> true, 
    :data => categories.as_json(:only => [:name,:image_url], :category => "nav") 
    } 
end 

型號：

def as_json(options = { }) 
    h = super(options) 
    if (options[:category] == 'main') { 
    h[:image_url]= "http://#{$request.try(:host_with_port)}#{self.image.url}" 
    } elsif (options[:category] == 'nav') { 
    h[:image_url]= "http://#{$request.try(:host_with_port)}#{self.image.url}" 
    h[:icon_url]= "http://#{$request.try(:host_with_port)}#{self.icon.url}" 
    } 

    h 
end