嗨，我在 rails 有一个控制器，但它给了我一个错误
ActiveRecord::StatementInvalid in StreamsController#front_page
Mysql2::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'EPOCH FROM posts.created_at) - 1327654606)/9000) desc LIMIT 15' at line 1: SELECT `posts`.* FROM `posts` WHERE ((`posts`.`featured` = 1 OR `posts`.`author_id` = 5)) ORDER BY (ln( 1 + posts.likes_count) + (EXTRACT(EPOCH FROM posts.created_at) - 1327654606)/9000) desc LIMIT 15
StreamsController#front_page 是：
def front_page
stream_responder do
@stream = Stream::FrontPage.new(current_user, params[:offset])
@stream_json = PostPresenter.collection_json(@stream.stream_posts, current_user, lite?: true, include_root: false)
end
end
和 PostPresenter
require File.join(File.dirname(__FILE__), '..', '..', 'lib', 'template_picker')
class PostPresenter
include ActionView::Helpers::TextHelper
attr_accessor :post, :current_user
def initialize(post, current_user=nil)
@post = post
@current_user = current_user
@person = @current_user.try(:person)
end
def self.collection_json(collection, current_user, opts={})
collection.includes(:author => :profile).map {|post| self.new(post, current_user).as_json(opts)}
end
def as_json(options={})
{
:id => @post.id,
:guid => @post.guid,
:text => @post.raw_message,
:plain_text => @post.plain_text,
:public => @post.public,
:featured => @post.featured,
:created_at => @post.created_at,
:staff_picked_at => @post.staff_picked_at,
:interacted_at => @post.interacted_at,
:tags => @post.tags.as_json,
:tag_list => @post.tags.map(&:name).join(", "),
:post_type => @post.post_type,
:image_url => @post.image_url,
:object_url => @post.object_url,
:favorite => @post.favorite,
:nsfw => @post.nsfw,
:author => PersonPresenter.new(@post.author, current_user),
:o_embed_cache => @post.o_embed_cache.try(:as_api_response, :backbone),
:mentioned_people => [],
:photos => @post.photos.map {|p| p.as_api_response(:backbone)},
:frame_name => @post.frame_name || template_name,
:parent => (options.fetch(:include_root, true) ? parent(options) : nil),
:title => title,
:next_post => next_post_path,
:previous_post => previous_post_path,
:screenshot_url => @post.screenshot_url,
:screenshot_width => @post.screenshot_width,
:screenshot_height => @post.screenshot_height,
:show_screenshot => self.show_screenshot?,
:has_gif => self.has_gif?,
:conversation_id => @post.conversation_id,
:interactions => options.fetch(:lite?, false) ? lite_interactions : heavy_interactions,
:original => @post.original?
}
end
def next_post_path
Rails.application.routes.url_helpers.next_post_path(@post)
end
def previous_post_path
Rails.application.routes.url_helpers.previous_post_path(@post)
end
def heavy_interactions
PostInteractionPresenter.new(@post, current_user).as_json
end
def lite_interactions
PostInteractionPresenter::Lite.new(@post, current_user).as_json
end
def title
@post.text.present? ? truncate(@post.plain_text, :length => 118) : I18n.translate('posts.presenter.title', :name => @post.author.name)
end
def template_name #kill me, lol, I should be client side
@template_name ||= TemplatePicker.new(@post).template_name
end
def parent(opts={})
PostPresenter.new(@post.parent, current_user).as_json({:include_root => false}.merge(opts)) if @post.respond_to?(:parent) && @post.parent.present?
end
def show_screenshot?
@post.screenshot_url.present?
end
def has_gif?
return false unless @post.photos.present?
return 'gif' if @post.photos.detect{ |p| p.url && p.url.match(".gif") }.present?
end
protected
def person
@current_user.person
end
def user_signed_in?
@current_user.present?
end
end
我不知道我在哪里做错了..？非常需要帮助