如何将额外的参数传递给控制器​​至控制器的as_json

Question

控制器中有两个apis。我需要main_category的图片和nav-category的图标。我怎样才能传递来自控制器的xtra参数，并且可以在模型中区分这个请求来自main_category并且这是来自nav_category。请帮忙。

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

我想你需要的是将自定义选项as_json方法来区分它们的内容。

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 

型号：

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