diff options
Diffstat (limited to 'activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb')
| -rw-r--r-- | activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb | 120 |
1 files changed, 86 insertions, 34 deletions
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 7105df1ee4..0438c95bd7 100644 --- a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb +++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb @@ -1,4 +1,6 @@ require 'active_record/migration/join_table' +require 'active_support/core_ext/string/access' +require 'digest' module ActiveRecord module ConnectionAdapters # :nodoc: @@ -132,6 +134,7 @@ module ActiveRecord # Make a temporary table. # [<tt>:force</tt>] # Set to true to drop the table before creating it. + # Set to +:cascade+ to drop dependent objects as well. # Defaults to false. # [<tt>:as</tt>] # SQL to use to generate the table. When this option is used, the block is @@ -203,7 +206,17 @@ module ActiveRecord end result = execute schema_creation.accept td - td.indexes.each_pair { |c, o| add_index(table_name, c, o) } unless supports_indexes_in_create? + + unless supports_indexes_in_create? + td.indexes.each_pair do |column_name, index_options| + add_index(table_name, column_name, index_options) + end + end + + td.foreign_keys.each_pair do |other_table_name, foreign_key_options| + add_foreign_key(table_name, other_table_name, foreign_key_options) + end + result end @@ -361,11 +374,15 @@ module ActiveRecord # Drops a table from the database. # - # Although this command ignores +options+ and the block if one is given, it can be helpful - # to provide these in a migration's +change+ method so it can be reverted. + # [<tt>:force</tt>] + # Set to +:cascade+ to drop dependent objects as well. + # Defaults to false. + # + # Although this command ignores most +options+ and the block if one is given, + # it can be helpful to provide these in a migration's +change+ method so it can be reverted. # In that case, +options+ and the block will be used by create_table. def drop_table(table_name, options = {}) - execute "DROP TABLE #{quote_table_name(table_name)}" + execute "DROP TABLE#{' IF EXISTS' if options[:if_exists]} #{quote_table_name(table_name)}" end # Adds a new column to the named table. @@ -571,6 +588,8 @@ module ActiveRecord # rename_index :people, 'index_people_on_last_name', 'index_users_on_last_name' # def rename_index(table_name, old_name, new_name) + validate_index_length!(table_name, new_name) + # this is a naive implementation; some DBs may support this more efficiently (Postgres, for instance) old_index_def = indexes(table_name).detect { |i| i.name == old_name } return unless old_index_def @@ -619,17 +638,16 @@ module ActiveRecord # # add_belongs_to(:products, :supplier, polymorphic: true) # - # ====== Create a supplier_id, supplier_type columns and appropriate index + # ====== Create supplier_id, supplier_type columns and appropriate index # # add_reference(:products, :supplier, polymorphic: true, index: true) # - def add_reference(table_name, ref_name, options = {}) - polymorphic = options.delete(:polymorphic) - index_options = options.delete(:index) - type = options.delete(:type) || :integer - add_column(table_name, "#{ref_name}_id", type, options) - add_column(table_name, "#{ref_name}_type", :string, polymorphic.is_a?(Hash) ? polymorphic : options) if polymorphic - add_index(table_name, polymorphic ? %w[id type].map{ |t| "#{ref_name}_#{t}" } : "#{ref_name}_id", index_options.is_a?(Hash) ? index_options : {}) if index_options + # ====== Create a supplier_id column and appropriate foreign key + # + # add_reference(:products, :supplier, foreign_key: true) + # + def add_reference(table_name, *args) + ReferenceDefinition.new(*args).add_to(update_table_definition(table_name, self)) end alias :add_belongs_to :add_reference @@ -644,7 +662,13 @@ module ActiveRecord # # remove_reference(:products, :supplier, polymorphic: true) # + # ====== Remove the reference with a foreign key + # + # remove_reference(:products, :user, index: true, foreign_key: true) + # def remove_reference(table_name, ref_name, options = {}) + remove_foreign_key table_name, ref_name.to_s.pluralize if options[:foreign_key] + remove_column(table_name, "#{ref_name}_id") remove_column(table_name, "#{ref_name}_type") if options[:polymorphic] end @@ -733,21 +757,7 @@ module ActiveRecord def remove_foreign_key(from_table, options_or_to_table = {}) return unless supports_foreign_keys? - if options_or_to_table.is_a?(Hash) - options = options_or_to_table - else - options = { column: foreign_key_column_for(options_or_to_table) } - end - - fk_name_to_delete = options.fetch(:name) do - fk_to_delete = foreign_keys(from_table).detect {|fk| fk.column == options[:column] } - - if fk_to_delete - fk_to_delete.name - else - raise ArgumentError, "Table '#{from_table}' has no foreign key on column '#{options[:column]}'" - end - end + fk_name_to_delete = foreign_key_for!(from_table, options_or_to_table).name at = create_alter_table from_table at.drop_foreign_key fk_name_to_delete @@ -755,6 +765,31 @@ module ActiveRecord execute schema_creation.accept(at) end + # Checks to see if a foreign key exists on a table for a given foreign key definition. + # + # # Check a foreign key exists + # foreign_key_exists?(:accounts, :branches) + # + # # Check a foreign key on specified column exists + # foreign_key_exists?(:accounts, column: :owner_id) + # + # # Check a foreign key with a custom name exists + # foreign_key_exists?(:accounts, name: "special_fk_name") + # + def foreign_key_exists?(from_table, options_or_to_table = {}) + foreign_key_for(from_table, options_or_to_table).present? + end + + def foreign_key_for(from_table, options_or_to_table = {}) # :nodoc: + return unless supports_foreign_keys? + foreign_keys(from_table).detect {|fk| fk.defined_for? options_or_to_table } + end + + def foreign_key_for!(from_table, options_or_to_table = {}) # :nodoc: + foreign_key_for(from_table, options_or_to_table) or \ + raise ArgumentError, "Table '#{from_table}' has no foreign key for #{options_or_to_table}" + end + def foreign_key_column_for(table_name) # :nodoc: "#{table_name.to_s.singularize}_id" end @@ -778,7 +813,7 @@ module ActiveRecord version = version.to_i sm_table = quote_table_name(ActiveRecord::Migrator.schema_migrations_table_name) - migrated = select_values("SELECT version FROM #{sm_table}").map { |v| v.to_i } + migrated = select_values("SELECT version FROM #{sm_table}").map(&:to_i) paths = migrations_paths.map {|p| "#{p}/[0-9]*_*.rb" } versions = Dir[*paths].map do |filename| filename.split('/').last.split('_').first.to_i @@ -816,6 +851,12 @@ module ActiveRecord raise ArgumentError, "Error adding decimal column: precision cannot be empty if scale is specified" end + elsif [:datetime, :time].include?(type) && precision ||= native[:precision] + if (0..6) === precision + column_type_sql << "(#{precision})" + else + raise(ActiveRecordError, "No #{native[:name]} type has precision of #{precision}. The allowed range of precision is from 0 to 6") + end elsif (type != :primary_key) && (limit ||= native.is_a?(Hash) && native[:limit]) column_type_sql << "(#{limit})" end @@ -835,11 +876,14 @@ module ActiveRecord columns end - # Adds timestamps (+created_at+ and +updated_at+) columns to the named table. + # Adds timestamps (+created_at+ and +updated_at+) columns to +table_name+. + # Additional options (like <tt>null: false</tt>) are forwarded to #add_column. # - # add_timestamps(:suppliers) + # add_timestamps(:suppliers, null: false) # def add_timestamps(table_name, options = {}) + options[:null] = false if options[:null].nil? + add_column table_name, :created_at, :datetime, options add_column table_name, :updated_at, :datetime, options end @@ -848,7 +892,7 @@ module ActiveRecord # # remove_timestamps(:suppliers) # - def remove_timestamps(table_name) + def remove_timestamps(table_name, options = {}) remove_column table_name, :updated_at remove_column table_name, :created_at end @@ -962,17 +1006,25 @@ module ActiveRecord end private - def create_table_definition(name, temporary, options, as = nil) + def create_table_definition(name, temporary = false, options = nil, as = nil) TableDefinition.new native_database_types, name, temporary, options, as end def create_alter_table(name) - AlterTable.new create_table_definition(name, false, {}) + AlterTable.new create_table_definition(name) end def foreign_key_name(table_name, options) # :nodoc: + identifier = "#{table_name}_#{options.fetch(:column)}_fk" + hashed_identifier = Digest::SHA256.hexdigest(identifier).first(10) options.fetch(:name) do - "fk_rails_#{SecureRandom.hex(5)}" + "fk_rails_#{hashed_identifier}" + end + end + + def validate_index_length!(table_name, new_name) + if new_name.length > allowed_index_name_length + raise ArgumentError, "Index name '#{new_name}' on table '#{table_name}' is too long; the limit is #{allowed_index_name_length} characters" end end end |