Class: ActiveRecord::SchemaMigration

Inherits:
Base show all
Defined in:
activerecord/lib/active_record/schema_migration.rb

Constant Summary

Constants included from ConnectionHandling

ConnectionHandling::VALID_CONN_PARAMS

Constants included from Transactions

Transactions::ACTIONS

Constants included from Callbacks

Callbacks::CALLBACKS

Constants included from AttributeMethods

AttributeMethods::AttrNames

Constants included from ActiveModel::AttributeMethods

ActiveModel::AttributeMethods::CALL_COMPILABLE_REGEXP, ActiveModel::AttributeMethods::NAME_COMPILABLE_REGEXP

Instance Attribute Summary

Attributes included from Associations

#association_cache

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Explain

#collecting_queries_for_explain, #exec_explain

Methods included from DynamicMatchers

#respond_to?

Methods included from Translation

#i18n_scope, #lookup_ancestors

Methods included from ActiveModel::Translation

#human_attribute_name, #i18n_scope, #lookup_ancestors

Methods included from ActiveModel::Naming

#model_name, param_key, plural, route_key, singular, singular_route_key, uncountable?

Methods included from Querying

#count_by_sql, #find_by_sql

Methods included from QueryCache::ClassMethods

#cache, #uncached

Methods included from ConnectionHandling

#clear_cache!, #connected?, #connection, #connection_config, #connection_id, #connection_id=, #connection_pool, #establish_connection, #mysql2_connection, #mysql_connection, #postgresql_connection, #remove_connection, #retrieve_connection, #sqlite3_connection

Methods included from ActiveSupport::DescendantsTracker

clear, descendants, #descendants, #direct_descendants, direct_descendants, #inherited, store_inherited

Methods included from ActiveSupport::Benchmarkable

#benchmark

Methods included from Core

#<=>, #==, #connection_handler, #encode_with, #freeze, #frozen?, #has_transactional_callbacks?, #hash, #init_with, #initialize, #initialize_dup, #inspect, #readonly!, #readonly?, #set_transaction_state, #slice

Methods included from ActiveSupport::Concern

#append_features, extended, #included

Methods included from Serialization

#serializable_hash, #to_xml

Methods included from ActiveModel::Serializers::Xml

#from_xml, #to_xml

Methods included from ActiveModel::Serialization

#serializable_hash

Methods included from ActiveModel::Serializers::JSON

#as_json, #from_json

Methods included from Reflection

add_reflection, create

Methods included from Transactions

#add_to_transaction, #committed!, #destroy, #rollback_active_record_state!, #rolledback!, #save, #save!, #transaction, #with_transaction_returning_status

Methods included from Aggregations

#clear_aggregation_cache

Methods included from NestedAttributes

#_destroy

Methods included from AutosaveAssociation

#changed_for_autosave?, #destroyed_by_association, #destroyed_by_association=, #mark_for_destruction, #marked_for_destruction?, #reload

Methods included from Associations

#association, #clear_association_cache

Methods included from ActiveSupport::Autoload

#autoload, #autoload_at, #autoload_under, #autoloads, #eager_autoload, #eager_load!, extended

Methods included from Timestamp

#initialize_dup

Methods included from Callbacks

#destroy, #touch

Methods included from AttributeMethods

#[], #[]=, #attribute_for_inspect, #attribute_names, #attribute_present?, #attributes, #column_for_attribute, #has_attribute?, #method_missing, #respond_to?

Methods included from ActiveModel::AttributeMethods

#attribute_missing, #method_missing, #respond_to?, #respond_to_without_attributes?

Methods included from Locking::Pessimistic

#lock!, #with_lock

Methods included from Locking::Optimistic

#locking_enabled?

Methods included from Validations

#save, #save!, #valid?

Methods included from ActiveModel::Validations

#errors, #initialize_dup, #invalid?, #valid?, #validates_with

Methods included from Integration

#cache_key, #to_param

Methods included from ActiveModel::Conversion

#to_key, #to_model, #to_param, #to_partial_path

Methods included from AttributeAssignment

#assign_attributes

Methods included from Sanitization

#quoted_id

Methods included from Scoping

#populate_with_current_scope_attributes

Methods included from Persistence

#becomes, #becomes!, #decrement, #decrement!, #delete, #destroy, #destroy!, #destroyed?, #increment, #increment!, #new_record?, #persisted?, #reload, #save, #save!, #toggle, #toggle!, #touch, #update, #update!, #update_attribute, #update_column, #update_columns

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class ActiveRecord::AttributeMethods

Class Method Details

.create_table(limit = nil) ⇒ Object 



21
22
23
24
25
26
27
28
29
30
31
 
# File 'activerecord/lib/active_record/schema_migration.rb', line 21

def create_table(limit=nil)
  unless table_exists?
    version_options = {null: false}
    version_options[:limit] = limit if limit

    connection.create_table(table_name, id: false) do |t|
      t.column :version, :string, version_options
    end
    connection.add_index table_name, :version, unique: true, name: index_name
  end
end

.drop_table ⇒ Object 



33
34
35
36
37
38
 
# File 'activerecord/lib/active_record/schema_migration.rb', line 33

def drop_table
  if table_exists?
    connection.remove_index table_name, name: index_name
    connection.drop_table(table_name)
  end
end

.index_name ⇒ Object 



13
14
15
 
# File 'activerecord/lib/active_record/schema_migration.rb', line 13

def index_name
  "#{table_name_prefix}unique_schema_migrations#{table_name_suffix}"
end

.table_exists? ⇒ Boolean

Returns:

  • (Boolean) 


17
18
19
 
# File 'activerecord/lib/active_record/schema_migration.rb', line 17

def table_exists?
  connection.table_exists?(table_name)
end

.table_name ⇒ Object 



9
10
11
 
# File 'activerecord/lib/active_record/schema_migration.rb', line 9

def table_name
  "#{table_name_prefix}schema_migrations#{table_name_suffix}"
end

Instance Method Details

#version ⇒ Object 



41
42
43
 
# File 'activerecord/lib/active_record/schema_migration.rb', line 41

def version
  super.to_i
end