Class: ActiveRecord::ConnectionAdapters::PostgreSQL::ExplainPrettyPrinter
- Defined in:
- lib/rubypitaya/app-template/vendor/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/connection_adapters/postgresql/explain_pretty_printer.rb
Overview
:nodoc:
Instance Method Summary collapse
-
#pp(result) ⇒ Object
Pretty prints the result of an EXPLAIN in a way that resembles the output of the PostgreSQL shell:.
Instance Method Details
#pp(result) ⇒ Object
Pretty prints the result of an EXPLAIN in a way that resembles the output of the PostgreSQL shell:
QUERY PLAN
------------------------------------------------------------------------------
Nested Loop Left Join (cost=0.00..37.24 rows=8 width=0)
Join Filter: (posts.user_id = users.id)
-> Index Scan using users_pkey on users (cost=0.00..8.27 rows=1 width=4)
Index Cond: (id = 1)
-> Seq Scan on posts (cost=0.00..28.88 rows=8 width=4)
Filter: (posts.user_id = 1)
(6 rows)
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 |
# File 'lib/rubypitaya/app-template/vendor/bundle/ruby/3.1.0/gems/activerecord-7.0.4/lib/active_record/connection_adapters/postgresql/explain_pretty_printer.rb', line 20 def pp(result) header = result.columns.first lines = result.rows.map(&:first) # We add 2 because there's one char of padding at both sides, note # the extra hyphens in the example above. width = [header, *lines].map(&:length).max + 2 pp = [] pp << header.center(width).rstrip pp << "-" * width pp += lines.map { |line| " #{line}" } nrows = result.rows.length rows_label = nrows == 1 ? "row" : "rows" pp << "(#{nrows} #{rows_label})" pp.join("\n") + "\n" end |