Post#tag_match: clean up read_only param.

* Drop /posts?ro=true param (broken).
* Clean up tag_match (rescuing PG::ConnectionBad didn't do anything, we
  just build the query here, we don't run it).

app/controllers/posts_controller.rb

@@ -9,7 +9,7 @@ class PostsController < ApplicationController
         format.html { redirect_to(@post) }
       end
     else
-      @post_set = PostSets::Post.new(tag_query, params[:page], params[:limit], raw: params[:raw], random: params[:random], format: params[:format], read_only: params[:ro])
+      @post_set = PostSets::Post.new(tag_query, params[:page], params[:limit], raw: params[:raw], random: params[:random], format: params[:format])
       @posts = @post_set.posts
       respond_with(@posts) do |format|
         format.atom

app/logical/post_sets/post.rb

@@ -1,7 +1,7 @@
 module PostSets
   class Post < PostSets::Base
     MAX_PER_PAGE = 200
-    attr_reader :tag_array, :page, :raw, :random, :post_count, :format, :read_only
+    attr_reader :tag_array, :page, :raw, :random, :post_count, :format
 
     def initialize(tags, page = 1, per_page = nil, options = {})
       @tag_array = Tag.scan_query(tags)
@@ -10,7 +10,6 @@ module PostSets
       @raw = options[:raw].present?
       @random = options[:random].present?
       @format = options[:format] || "html"
-      @read_only = options[:read_only]
     end
 
     def tag_string
@@ -134,7 +133,7 @@ module PostSets
         elsif raw
           temp = ::Post.raw_tag_match(tag_string).order("posts.id DESC").where("true /* PostSets::Post#posts:1 */").paginate(page, :count => post_count, :limit => per_page)
         else
-          temp = ::Post.tag_match(tag_string, read_only).where("true /* PostSets::Post#posts:2 */").paginate(page, :count => post_count, :limit => per_page)
+          temp = ::Post.tag_match(tag_string).where("true /* PostSets::Post#posts:2 */").paginate(page, :count => post_count, :limit => per_page)
         end
         temp.each # hack to force rails to eager load
         temp

app/models/post.rb

@@ -1682,21 +1682,8 @@ class Post < ApplicationRecord
       where("posts.tag_index @@ to_tsquery('danbooru', E?)", tag.to_escaped_for_tsquery)
     end
 
-    def tag_match(query, read_only = false)
+    def tag_match(query, read_only: false)
-      if query =~ /status:deleted.status:deleted/
+      PostQueryBuilder.new(query, read_only: read_only).build
-        # temp fix for degenerate crawlers
-        raise ActiveRecord::RecordNotFound
-      end
-
-      if read_only
-        begin
-          PostQueryBuilder.new(query, read_only: true).build
-        rescue PG::ConnectionBad
-          PostQueryBuilder.new(query).build
-        end
-      else
-        PostQueryBuilder.new(query).build
-      end
     end
   end
   

app/models/saved_search.rb

@@ -97,7 +97,7 @@ class SavedSearch < ApplicationRecord
         CurrentUser.as_system do
           redis_key = "search:#{query}"
           return if redis.exists(redis_key)
-          post_ids = Post.tag_match(query, true).limit(QUERY_LIMIT).pluck(:id)
+          post_ids = Post.tag_match(query, read_only: true).limit(QUERY_LIMIT).pluck(:id)
           redis.sadd(redis_key, post_ids)
           redis.expire(redis_key, REDIS_EXPIRY)
         end