Class: Sequel::Model::Associations::AssociationReflection
- Includes:
- Inflections
- Defined in:
- lib/sequel/model/associations.rb
Overview
AssociationReflection is a Hash subclass that keeps information on Sequel::Model associations. It provides methods to reduce internal code duplication. It should not be instantiated by the user.
Direct Known Subclasses
ManyToManyAssociationReflection, ManyToOneAssociationReflection, OneToManyAssociationReflection
Constant Summary
Constants included from Inflections
Inflections::CAMELIZE_CONVERT_REGEXP, Inflections::CAMELIZE_MODULE_REGEXP, Inflections::DASH, Inflections::DEMODULIZE_CONVERT_REGEXP, Inflections::EMPTY_STRING, Inflections::SLASH, Inflections::UNDERSCORE, Inflections::UNDERSCORE_CONVERT_REGEXP1, Inflections::UNDERSCORE_CONVERT_REGEXP2, Inflections::UNDERSCORE_CONVERT_REPLACE, Inflections::UNDERSCORE_MODULE_REGEXP, Inflections::VALID_CONSTANT_NAME_REGEXP
Instance Method Summary collapse
-
#_add_method ⇒ Object
Name symbol for the _add internal association method.
-
#_remove_all_method ⇒ Object
Name symbol for the _remove_all internal association method.
-
#_remove_method ⇒ Object
Name symbol for the _remove internal association method.
-
#_setter_method ⇒ Object
Name symbol for the _setter association method.
-
#add_method ⇒ Object
Name symbol for the add association method.
-
#apply_dataset_changes(ds) ⇒ Object
Apply all non-instance specific changes to the given dataset and return it.
-
#associated_class ⇒ Object
The class associated to the current model class via this association.
-
#associated_dataset ⇒ Object
The dataset associated via this association, with the non-instance specific changes already applied.
-
#association_method ⇒ Object
Name symbol for association method, the same as the name of the association.
-
#can_have_associated_objects?(obj) ⇒ Boolean
Whether this association can have associated objects, given the current object.
-
#dataset_method ⇒ Object
Name symbol for the dataset association method.
-
#dataset_need_primary_key? ⇒ Boolean
Whether the dataset needs a primary key to function, true by default.
-
#eager_graph_lazy_dataset? ⇒ Boolean
Whether to eagerly graph a lazy dataset, true by default.
-
#eager_limit_strategy ⇒ Object
The eager limit strategy to use for this dataset.
-
#eager_loader_key ⇒ Object
The key to use for the key hash when eager loading.
-
#eager_loading_predicate_key ⇒ Object
Alias of predicate_key, only for backwards compatibility.
-
#eager_loading_use_associated_key? ⇒ Boolean
By default associations do not need to select a key in an associated table to eagerly load.
-
#limit_and_offset ⇒ Object
The limit and offset for this association (returned as a two element array).
-
#need_associated_primary_key? ⇒ Boolean
Whether the associated object needs a primary key to be added/removed, false by default.
-
#predicate_keys ⇒ Object
The keys to use for loading of the regular dataset, as an array.
-
#qualify(table, col) ⇒ Object
Qualify
col
with the given table name. -
#qualify_assoc(col) ⇒ Object
Qualify col with the associated model’s table name.
-
#qualify_cur(col) ⇒ Object
Qualify col with the current model’s table name.
-
#reciprocal ⇒ Object
Returns the reciprocal association variable, if one exists.
-
#reciprocal_array? ⇒ Boolean
Whether the reciprocal of this association returns an array of objects instead of a single object, true by default.
-
#remove_all_method ⇒ Object
Name symbol for the remove_all_ association method.
-
#remove_before_destroy? ⇒ Boolean
Whether associated objects need to be removed from the association before being destroyed in order to preserve referential integrity.
-
#remove_method ⇒ Object
Name symbol for the remove_ association method.
-
#remove_should_check_existing? ⇒ Boolean
Whether to check that an object to be disassociated is already associated to this object, false by default.
-
#returns_array? ⇒ Boolean
Whether this association returns an array of objects instead of a single object, true by default.
-
#select ⇒ Object
The columns to select when loading the association.
-
#set_reciprocal_to_self? ⇒ Boolean
Whether to set the reciprocal association to self when loading associated records, false by default.
-
#setter_method ⇒ Object
Name symbol for the setter association method.
Methods included from Inflections
clear, irregular, plural, singular, uncountable
Methods inherited from Hash
#&, #case, #hstore, #pg_json, #sql_expr, #sql_negate, #sql_or, #|, #~
Instance Method Details
#_add_method ⇒ Object
Name symbol for the _add internal association method
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# File 'lib/sequel/model/associations.rb', line 21 def _add_method :"_add_#{singularize(self[:name])}" end |
#_remove_all_method ⇒ Object
Name symbol for the _remove_all internal association method
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# File 'lib/sequel/model/associations.rb', line 26 def _remove_all_method :"_remove_all_#{self[:name]}" end |
#_remove_method ⇒ Object
Name symbol for the _remove internal association method
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# File 'lib/sequel/model/associations.rb', line 31 def _remove_method :"_remove_#{singularize(self[:name])}" end |
#_setter_method ⇒ Object
Name symbol for the _setter association method
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# File 'lib/sequel/model/associations.rb', line 36 def _setter_method :"_#{self[:name]}=" end |
#add_method ⇒ Object
Name symbol for the add association method
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# File 'lib/sequel/model/associations.rb', line 41 def add_method :"add_#{singularize(self[:name])}" end |
#apply_dataset_changes(ds) ⇒ Object
Apply all non-instance specific changes to the given dataset and return it.
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# File 'lib/sequel/model/associations.rb', line 62 def apply_dataset_changes(ds) ds.extend(AssociationDatasetMethods) ds.association_reflection = self self[:extend].each{|m| ds.extend(m)} ds = ds.select(*select) if select if c = self[:conditions] ds = (c.is_a?(Array) && !Sequel.condition_specifier?(c)) ? ds.where(*c) : ds.where(c) end ds = ds.order(*self[:order]) if self[:order] ds = ds.limit(*self[:limit]) if self[:limit] ds = ds.limit(1) if !returns_array? && self[:key] ds = ds.eager(*self[:eager]) if self[:eager] ds = ds.distinct if self[:distinct] ds end |
#associated_class ⇒ Object
The class associated to the current model class via this association
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# File 'lib/sequel/model/associations.rb', line 51 def associated_class cached_fetch(:class){constantize(self[:class_name])} end |
#associated_dataset ⇒ Object
The dataset associated via this association, with the non-instance specific changes already applied.
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# File 'lib/sequel/model/associations.rb', line 57 def associated_dataset cached_fetch(:_dataset){apply_dataset_changes(associated_class.dataset.clone)} end |
#association_method ⇒ Object
Name symbol for association method, the same as the name of the association.
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# File 'lib/sequel/model/associations.rb', line 46 def association_method self[:name] end |
#can_have_associated_objects?(obj) ⇒ Boolean
Whether this association can have associated objects, given the current object. Should be false if obj cannot have associated objects because the necessary key columns are NULL.
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# File 'lib/sequel/model/associations.rb', line 81 def can_have_associated_objects?(obj) true end |
#dataset_method ⇒ Object
Name symbol for the dataset association method
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# File 'lib/sequel/model/associations.rb', line 86 def dataset_method :"#{self[:name]}_dataset" end |
#dataset_need_primary_key? ⇒ Boolean
Whether the dataset needs a primary key to function, true by default.
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# File 'lib/sequel/model/associations.rb', line 91 def dataset_need_primary_key? true end |
#eager_graph_lazy_dataset? ⇒ Boolean
Whether to eagerly graph a lazy dataset, true by default. If this is false, the association won’t respect the :eager_graph option when loading the association for a single record.
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# File 'lib/sequel/model/associations.rb', line 135 def eager_graph_lazy_dataset? true end |
#eager_limit_strategy ⇒ Object
The eager limit strategy to use for this dataset.
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# File 'lib/sequel/model/associations.rb', line 96 def eager_limit_strategy cached_fetch(:_eager_limit_strategy) do if self[:limit] case s = cached_fetch(:eager_limit_strategy){self[:model].default_eager_limit_strategy || :ruby} when true ds = associated_class.dataset if ds.supports_window_functions? :window_function else :ruby end else s end else nil end end end |
#eager_loader_key ⇒ Object
The key to use for the key hash when eager loading
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# File 'lib/sequel/model/associations.rb', line 117 def eager_loader_key self[:eager_loader_key] end |
#eager_loading_predicate_key ⇒ Object
Alias of predicate_key, only for backwards compatibility.
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# File 'lib/sequel/model/associations.rb', line 128 def eager_loading_predicate_key predicate_key end |
#eager_loading_use_associated_key? ⇒ Boolean
By default associations do not need to select a key in an associated table to eagerly load.
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# File 'lib/sequel/model/associations.rb', line 123 def eager_loading_use_associated_key? false end |
#limit_and_offset ⇒ Object
The limit and offset for this association (returned as a two element array).
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# File 'lib/sequel/model/associations.rb', line 140 def limit_and_offset if (v = self[:limit]).is_a?(Array) v else [v, nil] end end |
#need_associated_primary_key? ⇒ Boolean
Whether the associated object needs a primary key to be added/removed, false by default.
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# File 'lib/sequel/model/associations.rb', line 150 def need_associated_primary_key? false end |
#predicate_keys ⇒ Object
The keys to use for loading of the regular dataset, as an array.
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# File 'lib/sequel/model/associations.rb', line 155 def predicate_keys cached_fetch(:predicate_keys){Array(predicate_key)} end |
#qualify(table, col) ⇒ Object
Qualify col
with the given table name. If col
is an array of columns, return an array of qualified columns. Only qualifies Symbols and SQL::Identifier values, other values are not modified.
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# File 'lib/sequel/model/associations.rb', line 162 def qualify(table, col) transform(col) do |k| case k when Symbol, SQL::Identifier SQL::QualifiedIdentifier.new(table, k) else Sequel::Qualifier.new(self[:model].dataset, table).transform(k) end end end |
#qualify_assoc(col) ⇒ Object
Qualify col with the associated model’s table name.
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# File 'lib/sequel/model/associations.rb', line 174 def qualify_assoc(col) qualify(associated_class.table_name, col) end |
#qualify_cur(col) ⇒ Object
Qualify col with the current model’s table name.
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# File 'lib/sequel/model/associations.rb', line 179 def qualify_cur(col) qualify(self[:model].table_name, col) end |
#reciprocal ⇒ Object
Returns the reciprocal association variable, if one exists. The reciprocal association is the association in the associated class that is the opposite of the current association. For example, Album.many_to_one :artist and Artist.one_to_many :albums are reciprocal associations. This information is to populate reciprocal associations. For example, when you do this_artist.add_album(album) it sets album.artist to this_artist.
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# File 'lib/sequel/model/associations.rb', line 189 def reciprocal cached_fetch(:reciprocal) do possible_recips = [] fallback_recips = [] associated_class.all_association_reflections.each do |assoc_reflect| if reciprocal_association?(assoc_reflect) if deprecated_reciprocal_association?(assoc_reflect) fallback_recips << assoc_reflect else possible_recips << assoc_reflect end end end Sequel::Deprecation.deprecate("Multiple reciprocal association candidates found for #{self[:name]} association (#{possible_recips.map{|r| r[:name]}.join(', ')}). Choosing the first candidate is", "Please explicitly specify the reciprocal option for the #{self[:name]} association") if possible_recips.size >= 2 if possible_recips.empty? && !fallback_recips.empty? possible_recips = fallback_recips Sequel::Deprecation.deprecate("All reciprocal association candidates found for #{self[:name]} association have conditions, blocks, or differing primary keys (#{possible_recips.map{|r| r[:name]}.join(', ')}). Automatic choosing of an reciprocal association with conditions or blocks is", "Please explicitly specify the reciprocal option for the #{self[:name]} association") end unless possible_recips.empty? cached_set(:reciprocal_type, possible_recips.first[:type]) if reciprocal_type.is_a?(Array) possible_recips.first[:name] end end end |
#reciprocal_array? ⇒ Boolean
Whether the reciprocal of this association returns an array of objects instead of a single object, true by default.
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# File 'lib/sequel/model/associations.rb', line 219 def reciprocal_array? true end |
#remove_all_method ⇒ Object
Name symbol for the remove_all_ association method
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# File 'lib/sequel/model/associations.rb', line 224 def remove_all_method :"remove_all_#{self[:name]}" end |
#remove_before_destroy? ⇒ Boolean
Whether associated objects need to be removed from the association before being destroyed in order to preserve referential integrity.
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# File 'lib/sequel/model/associations.rb', line 230 def remove_before_destroy? true end |
#remove_method ⇒ Object
Name symbol for the remove_ association method
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# File 'lib/sequel/model/associations.rb', line 235 def remove_method :"remove_#{singularize(self[:name])}" end |
#remove_should_check_existing? ⇒ Boolean
Whether to check that an object to be disassociated is already associated to this object, false by default.
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# File 'lib/sequel/model/associations.rb', line 240 def remove_should_check_existing? false end |
#returns_array? ⇒ Boolean
Whether this association returns an array of objects instead of a single object, true by default.
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# File 'lib/sequel/model/associations.rb', line 246 def returns_array? true end |
#select ⇒ Object
The columns to select when loading the association.
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# File 'lib/sequel/model/associations.rb', line 251 def select self[:select] end |
#set_reciprocal_to_self? ⇒ Boolean
Whether to set the reciprocal association to self when loading associated records, false by default.
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# File 'lib/sequel/model/associations.rb', line 257 def set_reciprocal_to_self? false end |
#setter_method ⇒ Object
Name symbol for the setter association method
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# File 'lib/sequel/model/associations.rb', line 262 def setter_method :"#{self[:name]}=" end |