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author | Matthew Draper <matthew@trebex.net> | 2017-04-17 02:58:52 +0930 |
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committer | GitHub <noreply@github.com> | 2017-04-17 02:58:52 +0930 |
commit | e1e3be7c02acb0facbf81a97bbfe6d1a6e9ca598 (patch) | |
tree | 5640f0f52e7f19bc349abb3127cff6ea4437b305 /activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb | |
parent | 01caad190f8f6aa1fe36f1cda764f22b6df72e22 (diff) | |
parent | 606830d27a32fab23c0964b4383807fcdfdd7eba (diff) | |
download | rails-e1e3be7c02acb0facbf81a97bbfe6d1a6e9ca598.tar.gz rails-e1e3be7c02acb0facbf81a97bbfe6d1a6e9ca598.tar.bz2 rails-e1e3be7c02acb0facbf81a97bbfe6d1a6e9ca598.zip |
Merge pull request #28773 from kamipo/support_descending_indexes
Support Descending Indexes for MySQL
Diffstat (limited to 'activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb')
-rw-r--r-- | activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb index 9e2d0fb5e7..571edffec7 100644 --- a/activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb +++ b/activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb @@ -2,6 +2,49 @@ module ActiveRecord module ConnectionAdapters module MySQL module SchemaStatements # :nodoc: + # Returns an array of indexes for the given table. + def indexes(table_name, name = nil) + if name + ActiveSupport::Deprecation.warn(<<-MSG.squish) + Passing name to #indexes is deprecated without replacement. + MSG + end + + indexes = [] + current_index = nil + execute_and_free("SHOW KEYS FROM #{quote_table_name(table_name)}", "SCHEMA") do |result| + each_hash(result) do |row| + if current_index != row[:Key_name] + next if row[:Key_name] == "PRIMARY" # skip the primary key + current_index = row[:Key_name] + + mysql_index_type = row[:Index_type].downcase.to_sym + case mysql_index_type + when :fulltext, :spatial + index_type = mysql_index_type + when :btree, :hash + index_using = mysql_index_type + end + + indexes << IndexDefinition.new( + row[:Table], + row[:Key_name], + row[:Non_unique].to_i == 0, + type: index_type, + using: index_using, + comment: row[:Index_comment].presence + ) + end + + indexes.last.columns << row[:Column_name] + indexes.last.lengths.merge!(row[:Column_name] => row[:Sub_part].to_i) if row[:Sub_part] + indexes.last.orders.merge!(row[:Column_name] => :desc) if row[:Collation] == "D" + end + end + + indexes + end + private def schema_creation MySQL::SchemaCreation.new(self) |