REFACTOR: move remap out of script into a class

lib/remap.rb

@@ -0,0 +1,43 @@
+class Remap
+  def initialize(from, to, regex: false, verbose: false)
+    @from = from
+    @to = to
+    @regex = regex
+    @verbose = verbose
+  end
+
+  def perform
+    sql = "SELECT table_name, column_name
+FROM information_schema.columns
+WHERE table_schema='public' and (data_type like 'char%' or data_type like 'text%') and is_updatable = 'YES'"
+
+    cnn = ActiveRecord::Base.connection.raw_connection
+
+    results = cnn.async_exec(sql).to_a
+
+    results.each do |result|
+      table_name = result["table_name"]
+      column_name = result["column_name"]
+
+      log "Remapping #{table_name} #{column_name}"
+
+      result = if @regex
+        cnn.async_exec("UPDATE #{table_name}
+          SET #{column_name} = regexp_replace(#{column_name}, $1, $2, 'g')
+          WHERE NOT #{column_name} IS NULL
+            AND #{column_name} <> regexp_replace(#{column_name}, $1, $2, 'g')", [@from, @to])
+      else
+        cnn.async_exec("UPDATE #{table_name}
+          SET #{column_name} = replace(#{column_name}, $1, $2)
+          WHERE NOT #{column_name} IS NULL
+            AND #{column_name} <> replace(#{column_name}, $1, $2)", [@from, @to])
+      end
+
+      log "#{result.cmd_tuples} rows affected!"
+    end
+  end
+
+  def log(message)
+    puts(message) if @verbose
+  end
+end

script/discourse

@@ -30,6 +30,7 @@ class DiscourseCLI < Thor
   option :regex, type: :boolean
   def remap(from, to)
     load_rails
+    require 'remap'
 
     if options[:regex]
       puts "Rewriting all occurences of #{from} to #{to} using regexp_replace"
@@ -237,36 +238,13 @@ class DiscourseCLI < Thor
   end
 
   def do_remap(from, to, regex = false)
-    sql = "SELECT table_name, column_name
-FROM information_schema.columns
-WHERE table_schema='public' and (data_type like 'char%' or data_type like 'text%') and is_updatable = 'YES'"
-
-    cnn = ActiveRecord::Base.connection.raw_connection
-
-    results = cnn.async_exec(sql).to_a
-
-    results.each do |result|
-      table_name = result["table_name"]
-      column_name = result["column_name"]
-      puts "Remapping #{table_name} #{column_name}"
-      begin
-        result = if regex
-          cnn.async_exec("UPDATE #{table_name}
-            SET #{column_name} = regexp_replace(#{column_name}, $1, $2, 'g')
-            WHERE NOT #{column_name} IS NULL
-              AND #{column_name} <> regexp_replace(#{column_name}, $1, $2, 'g')", [from, to])
-        else
-          cnn.async_exec("UPDATE #{table_name}
-            SET #{column_name} = replace(#{column_name}, $1, $2)
-            WHERE NOT #{column_name} IS NULL
-              AND #{column_name} <> replace(#{column_name}, $1, $2)", [from, to])
-        end
-        puts "#{result.cmd_tuples} rows affected!"
-      rescue => ex
-        puts "Error: #{ex}"
-        puts "The remap has only been partially applied due to the error above. Please re-run the script again."
-        exit(1)
-      end
+    begin
+      Remap.new(from, to, regex: regex, verbose: true).perform
+      puts 'Done', ''
+    rescue => ex
+      puts "Error: #{ex}"
+      puts "The remap has only been partially applied due to the error above. Please re-run the script again."
+      exit(1)
     end
   end