From 5b95730edc33ee97f53da26a3868eb983305a771 Mon Sep 17 00:00:00 2001 From: Emili Parreno Date: Sat, 8 May 2010 12:35:39 +0100 Subject: Add index length support for MySQL [#1852 state:resolved] Example: add_index(:accounts, :name, :name => 'by_name', :length => 10) => CREATE INDEX by_name ON accounts(name(10)) add_index(:accounts, [:name, :surname], :name => 'by_name_surname', :length => {:name => 10, :surname => 15}) => CREATE INDEX by_name_surname ON accounts(name(10), surname(15)) Signed-off-by: Pratik Naik --- .../abstract/schema_statements.rb | 23 +++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) (limited to 'activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb') diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb index e8cba1bd41..1255ef09be 100644 --- a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb +++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb @@ -256,18 +256,32 @@ module ActiveRecord # name. # # ===== Examples + # # ====== Creating a simple index # add_index(:suppliers, :name) # generates # CREATE INDEX suppliers_name_index ON suppliers(name) + # # ====== Creating a unique index # add_index(:accounts, [:branch_id, :party_id], :unique => true) # generates # CREATE UNIQUE INDEX accounts_branch_id_party_id_index ON accounts(branch_id, party_id) + # # ====== Creating a named index # add_index(:accounts, [:branch_id, :party_id], :unique => true, :name => 'by_branch_party') # generates # CREATE UNIQUE INDEX by_branch_party ON accounts(branch_id, party_id) + # + # ====== Creating an index with specific key length + # add_index(:accounts, :name, :name => 'by_name', :length => 10) + # generates + # CREATE INDEX by_name ON accounts(name(10)) + # + # add_index(:accounts, [:name, :surname], :name => 'by_name_surname', :length => {:name => 10, :surname => 15}) + # generates + # CREATE INDEX by_name_surname ON accounts(name(10), surname(15)) + # + # Note: SQLite doesn't support index length def add_index(table_name, column_name, options = {}) column_names = Array.wrap(column_name) index_name = index_name(table_name, :column => column_names) @@ -278,7 +292,9 @@ module ActiveRecord else index_type = options end - quoted_column_names = column_names.map { |e| quote_column_name(e) }.join(", ") + + quoted_column_names = quoted_columns_for_index(column_names, options).join(", ") + execute "CREATE #{index_type} INDEX #{quote_column_name(index_name)} ON #{quote_table_name(table_name)} (#{quoted_column_names})" end @@ -430,6 +446,11 @@ module ActiveRecord end protected + # Overridden by the mysql adapter for supporting index lengths + def quoted_columns_for_index(column_names, options = {}) + column_names.map {|name| quote_column_name(name) } + end + def options_include_default?(options) options.include?(:default) && !(options[:null] == false && options[:default].nil?) end -- cgit v1.2.3