Class: ActiveRecord::InternalMetadata
- Defined in:
- lib/active_record/internal_metadata.rb
Overview
This class is used to create a table that keeps track of values and keys such as which environment migrations were run in.
Constant Summary
Constants included from ConnectionHandling
ConnectionHandling::DEFAULT_ENV, ConnectionHandling::ER_BAD_DB_ERROR, ConnectionHandling::RAILS_ENV
Constants included from Querying
Constants included from Transactions
Constants included from Callbacks
Constants included from AttributeMethods
AttributeMethods::RESTRICTED_CLASS_METHODS
Instance Attribute Summary
Attributes included from ConnectionHandling
#connection_specification_name
Class Method Summary collapse
- .[](key) ⇒ Object
- .[]=(key, value) ⇒ Object
- ._internal? ⇒ Boolean
-
.create_table ⇒ Object
Creates an internal metadata table with columns
key
andvalue
. - .drop_table ⇒ Object
- .primary_key ⇒ Object
- .table_exists? ⇒ Boolean
- .table_name ⇒ Object
Methods included from ConnectionHandling
#clear_cache!, #clear_query_caches_for_current_thread, #connected?, #connected_to, #connected_to?, #connection, #connection_config, #connection_pool, #connects_to, #current_role, #establish_connection, #lookup_connection_handler, #mysql2_connection, #postgresql_connection, #primary_class?, #remove_connection, #resolve_config_for_connection, #retrieve_connection, #sqlite3_connection, #with_handler
Methods included from QueryCache::ClassMethods
Methods included from Querying
Methods included from Translation
#i18n_scope, #lookup_ancestors
Methods included from Explain
#collecting_queries_for_explain, #exec_explain
Methods included from Enum
Methods included from Delegation::DelegateCache
#generate_relation_method, #inherited, #initialize_relation_delegate_cache, #relation_delegate_class
Methods included from Aggregations::ClassMethods
Methods included from Suppressor
Methods included from Serialization
Methods included from Reflection
add_aggregate_reflection, add_reflection, create
Methods included from NoTouching
applied_to?, apply_to, #no_touching?, #touch, #touch_later
Methods included from TouchLater
Methods included from Transactions
#before_committed!, #committed!, #destroy, #rolledback!, #save, #save!, #touch, #transaction, #trigger_transactional_callbacks?, #with_transaction_returning_status
Methods included from NestedAttributes
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, #association_cached?, eager_load!, #initialize_dup, #reload
Methods included from Timestamp
Methods included from Callbacks
Methods included from AttributeMethods
#[], #[]=, #accessed_fields, #attribute_for_inspect, #attribute_names, #attribute_present?, #attributes, #has_attribute?, #respond_to?
Methods included from Locking::Pessimistic
Methods included from Locking::Optimistic
Methods included from Validations
Methods included from Integration
#cache_key, #cache_key_with_version, #cache_version, #to_param
Methods included from Scoping
#initialize_internals_callback, #populate_with_current_scope_attributes
Methods included from Inheritance
Methods included from ModelSchema
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
Methods included from Core
#<=>, #==, #blank?, #connection_handler, #encode_with, #freeze, #frozen?, #hash, #init_with, #init_with_attributes, #initialize, #initialize_dup, #inspect, #present?, #pretty_print, #readonly!, #readonly?, #slice
Class Method Details
.[](key) ⇒ Object
27 28 29 |
# File 'lib/active_record/internal_metadata.rb', line 27 def [](key) where(key: key).pluck(:value).first end |
.[]=(key, value) ⇒ Object
23 24 25 |
# File 'lib/active_record/internal_metadata.rb', line 23 def []=(key, value) find_or_initialize_by(key: key).update!(value: value) end |
._internal? ⇒ Boolean
11 12 13 |
# File 'lib/active_record/internal_metadata.rb', line 11 def _internal? true end |
.create_table ⇒ Object
Creates an internal metadata table with columns key
and value
36 37 38 39 40 41 42 43 44 45 46 |
# File 'lib/active_record/internal_metadata.rb', line 36 def create_table unless table_exists? = connection. connection.create_table(table_name, id: false) do |t| t.string :key, ** t.string :value t. end end end |
.drop_table ⇒ Object
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# File 'lib/active_record/internal_metadata.rb', line 48 def drop_table connection.drop_table table_name, if_exists: true end |
.primary_key ⇒ Object
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# File 'lib/active_record/internal_metadata.rb', line 15 def primary_key "key" end |
.table_exists? ⇒ Boolean
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# File 'lib/active_record/internal_metadata.rb', line 31 def table_exists? connection.table_exists?(table_name) end |
.table_name ⇒ Object
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# File 'lib/active_record/internal_metadata.rb', line 19 def table_name "#{table_name_prefix}#{}#{table_name_suffix}" end |