Class: Sequel::Model::Associations::AssociationReflection

### Home Classes Methods

### In Files

- lib/sequel/model/associations.rb

### Parent

Hash

### Methods

- #_add_method
- #_remove_all_method
- #_remove_method
- #_setter_method
- #add_method
- #apply_dataset_changes
- #associated_class
- #associated_dataset
- #association_method
- #can_have_associated_objects?
- #dataset_method
- #dataset_need_primary_key?
- #eager_graph_lazy_dataset?
- #eager_limit_strategy
- #eager_loader_key
- #eager_loading_predicate_key
- #eager_loading_use_associated_key?
- #filter_by_associations_add_conditions?
- #filter_by_associations_conditions_expression
- #limit_and_offset
- #need_associated_primary_key?
- #predicate_keys
- #qualify
- #qualify_assoc
- #qualify_cur
- #reciprocal
- #reciprocal_array?
- #remove_all_method
- #remove_before_destroy?
- #remove_method
- #remove_should_check_existing?
- #returns_array?
- #select
- #set_reciprocal_to_self?
- #setter_method
- #slice_range

### Included Modules

- Sequel::Inflections

### Files

- CHANGELOG
- MIT-LICENSE
- README.rdoc
- active_record.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- bin_sequel.rdoc
- cheat_sheet.rdoc
- code_order.rdoc
- core_extensions.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- extensions.rdoc
- mass_assignment.rdoc
- migration.rdoc
- model_hooks.rdoc
- model_plugins.rdoc
- object_model.rdoc
- opening_databases.rdoc
- postgresql.rdoc
- prepared_statements.rdoc
- querying.rdoc
- reflection.rdoc
- 1.0.txt
- 1.1.txt
- 1.3.txt
- 1.4.0.txt
- 1.5.0.txt
- 2.0.0.txt
- 2.1.0.txt
- 2.10.0.txt
- 2.11.0.txt
- 2.12.0.txt
- 2.2.0.txt
- 2.3.0.txt
- 2.4.0.txt
- 2.5.0.txt
- 2.6.0.txt
- 2.7.0.txt
- 2.8.0.txt
- 2.9.0.txt
- 3.0.0.txt
- 3.1.0.txt
- 3.10.0.txt
- 3.11.0.txt
- 3.12.0.txt
- 3.13.0.txt
- 3.14.0.txt
- 3.15.0.txt
- 3.16.0.txt
- 3.17.0.txt
- 3.18.0.txt
- 3.19.0.txt
- 3.2.0.txt
- 3.20.0.txt
- 3.21.0.txt
- 3.22.0.txt
- 3.23.0.txt
- 3.24.0.txt
- 3.25.0.txt
- 3.26.0.txt
- 3.27.0.txt
- 3.28.0.txt
- 3.29.0.txt
- 3.3.0.txt
- 3.30.0.txt
- 3.31.0.txt
- 3.32.0.txt
- 3.33.0.txt
- 3.34.0.txt
- 3.35.0.txt
- 3.36.0.txt
- 3.37.0.txt
- 3.38.0.txt
- 3.39.0.txt
- 3.4.0.txt
- 3.40.0.txt
- 3.41.0.txt
- 3.42.0.txt
- 3.43.0.txt
- 3.44.0.txt
- 3.45.0.txt
- 3.46.0.txt
- 3.47.0.txt
- 3.48.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- 4.0.0.txt
- 4.1.0.txt
- 4.2.0.txt
- 4.3.0.txt
- 4.4.0.txt
- 4.5.0.txt
- schema_modification.rdoc
- security.rdoc
- sharding.rdoc
- sql.rdoc
- testing.rdoc
- thread_safety.rdoc
- transactions.rdoc
- validations.rdoc
- virtual_rows.rdoc

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- Sequel::SQLite::Dataset::BindArgumentMethods
- Sequel::SQLite::Dataset::PreparedStatementMethods
- Sequel::SQLite::DatasetMethods
- Sequel::Schema
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- Sequel::Sequel3DatasetMethods
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- Sequel::Swift
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- Sequel::ThreadLocalTimezones
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- Sequel::TimestampMigrator
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- Sequel::TinyTDS
- Sequel::TinyTDS::Database
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- Sequel::TinyTDS::Dataset::ArgumentMapper
- Sequel::TinyTDS::Dataset::PreparedStatementMethods
- Sequel::ToDot
- Sequel::ToDot::DatasetMethods
- Sequel::UnbindDuplicate
- Sequel::Unbinder
- Sequel::UndefinedAssociation
- Sequel::UniqueConstraintViolation
- Sequel::UnthreadedServerBlock
- Sequel::ValidationFailed
- String
- String::Inflections
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# Sequel::Model::Associations::AssociationReflection

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.

### Public Instance Methods

_add_method() click to toggle source

Name symbol for the _add internal association method

    # File lib/sequel/model/associations.rb, line 22
    def _add_method
      :"_add_#{singularize(self[:name])}"
    end

_remove_all_method() click to toggle source

Name symbol for the _remove_all internal association method

    # File lib/sequel/model/associations.rb, line 27
    def _remove_all_method
      :"_remove_all_#{self[:name]}"
    end

_remove_method() click to toggle source

Name symbol for the _remove internal association method

    # File lib/sequel/model/associations.rb, line 32
    def _remove_method
      :"_remove_#{singularize(self[:name])}"
    end

_setter_method() click to toggle source

Name symbol for the _setter association method

    # File lib/sequel/model/associations.rb, line 37
    def _setter_method
      :"_#{self[:name]}="
    end

add_method() click to toggle source

Name symbol for the add association method

    # File lib/sequel/model/associations.rb, line 42
    def add_method
      :"add_#{singularize(self[:name])}"
    end

apply_dataset_changes(ds) click to toggle source

Apply all non-instance specific changes to the given dataset and return it.

    # File lib/sequel/model/associations.rb, line 63
    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() click to toggle source

The class associated to the current model class via this association

    # File lib/sequel/model/associations.rb, line 52
    def associated_class
      cached_fetch(:class){constantize(self[:class_name])}
    end

associated_dataset() click to toggle source

The dataset associated via this association, with the non-instance specific changes already applied.

    # File lib/sequel/model/associations.rb, line 58
    def associated_dataset
      cached_fetch(:_dataset){apply_dataset_changes(associated_class.dataset.clone)}
    end

association_method() click to toggle source

Name symbol for association method, the same as the name of the association.

    # File lib/sequel/model/associations.rb, line 47
    def association_method
      self[:name]
    end

can_have_associated_objects?(obj) click to toggle source

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.

    # File lib/sequel/model/associations.rb, line 82
    def can_have_associated_objects?(obj)
      true
    end

dataset_method() click to toggle source

Name symbol for the dataset association method

    # File lib/sequel/model/associations.rb, line 87
    def dataset_method
      :"#{self[:name]}_dataset"
    end

dataset_need_primary_key?() click to toggle source

Whether the dataset needs a primary key to function, true by default.

    # File lib/sequel/model/associations.rb, line 92
    def dataset_need_primary_key?
      true
    end

eager_graph_lazy_dataset?() click to toggle source

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.

    # File lib/sequel/model/associations.rb, line 136
    def eager_graph_lazy_dataset?
      true
    end

eager_limit_strategy() click to toggle source

The eager limit strategy to use for this dataset.

    # File lib/sequel/model/associations.rb, line 97
    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() click to toggle source

The key to use for the key hash when eager loading

    # File lib/sequel/model/associations.rb, line 118
    def eager_loader_key
      self[:eager_loader_key]
    end

eager_loading_predicate_key() click to toggle source

Alias of predicate_key, only for backwards compatibility.

    # File lib/sequel/model/associations.rb, line 129
    def eager_loading_predicate_key
      predicate_key
    end

eager_loading_use_associated_key?() click to toggle source

By default associations do not need to select a key in an associated table to eagerly load.

    # File lib/sequel/model/associations.rb, line 124
    def eager_loading_use_associated_key?
      false
    end

filter_by_associations_add_conditions?() click to toggle source

Whether additional conditions should be added when using the filter by associations support.

    # File lib/sequel/model/associations.rb, line 142
    def filter_by_associations_add_conditions?
      self[:conditions] || self[:eager_block]
    end

filter_by_associations_conditions_expression(obj) click to toggle source

The expression to use for the additional conditions to be added for the filter by association support, when the association itself is filtered. Works by using a subquery to test that the objects passed also meet the association filter criteria.

    # File lib/sequel/model/associations.rb, line 150
    def filter_by_associations_conditions_expression(obj)
      ds = filter_by_associations_conditions_dataset.where(filter_by_associations_conditions_subquery_conditions(obj))
      {filter_by_associations_conditions_key=>ds}
    end

limit_and_offset() click to toggle source

The limit and offset for this association (returned as a two element array).

    # File lib/sequel/model/associations.rb, line 156
    def limit_and_offset
      if (v = self[:limit]).is_a?(Array)
        v
      else
        [v, nil]
      end
    end

need_associated_primary_key?() click to toggle source

Whether the associated object needs a primary key to be added/removed, false by default.

    # File lib/sequel/model/associations.rb, line 166
    def need_associated_primary_key?
      false
    end

predicate_keys() click to toggle source

The keys to use for loading of the regular dataset, as an array.

    # File lib/sequel/model/associations.rb, line 171
    def predicate_keys
      cached_fetch(:predicate_keys){Array(predicate_key)}
    end

qualify(table, col) click to toggle source

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.

    # File lib/sequel/model/associations.rb, line 178
    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) click to toggle source

Qualify col with the associated model's table name.

    # File lib/sequel/model/associations.rb, line 190
    def qualify_assoc(col)
      qualify(associated_class.table_name, col)
    end

qualify_cur(col) click to toggle source

Qualify col with the current model's table name.

    # File lib/sequel/model/associations.rb, line 195
    def qualify_cur(col)
      qualify(self[:model].table_name, col)
    end

reciprocal() click to toggle source

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.

    # File lib/sequel/model/associations.rb, line 205
    def reciprocal
      cached_fetch(:reciprocal) do
        possible_recips = []

        associated_class.all_association_reflections.each do |assoc_reflect|
          if reciprocal_association?(assoc_reflect)
            possible_recips << assoc_reflect
          end
        end

        if possible_recips.length == 1
          cached_set(:reciprocal_type, possible_recips.first[:type]) if reciprocal_type.is_a?(Array)
          possible_recips.first[:name]
        end
      end
    end

reciprocal_array?() click to toggle source

Whether the reciprocal of this association returns an array of objects instead of a single object, true by default.

    # File lib/sequel/model/associations.rb, line 224
    def reciprocal_array?
      true
    end

remove_all_method() click to toggle source

Name symbol for the remove_all_ association method

    # File lib/sequel/model/associations.rb, line 229
    def remove_all_method
      :"remove_all_#{self[:name]}"
    end

remove_before_destroy?() click to toggle source

Whether associated objects need to be removed from the association before being destroyed in order to preserve referential integrity.

    # File lib/sequel/model/associations.rb, line 235
    def remove_before_destroy?
      true
    end

remove_method() click to toggle source

Name symbol for the remove_ association method

    # File lib/sequel/model/associations.rb, line 240
    def remove_method
      :"remove_#{singularize(self[:name])}"
    end

remove_should_check_existing?() click to toggle source

Whether to check that an object to be disassociated is already associated to this object, false by default.

    # File lib/sequel/model/associations.rb, line 245
    def remove_should_check_existing?
      false
    end

returns_array?() click to toggle source

Whether this association returns an array of objects instead of a single object, true by default.

    # File lib/sequel/model/associations.rb, line 251
    def returns_array?
      true
    end

select() click to toggle source

The columns to select when loading the association.

    # File lib/sequel/model/associations.rb, line 256
    def select
      self[:select]
    end

set_reciprocal_to_self?() click to toggle source

Whether to set the reciprocal association to self when loading associated records, false by default.

    # File lib/sequel/model/associations.rb, line 262
    def set_reciprocal_to_self?
      false
    end

setter_method() click to toggle source

Name symbol for the setter association method

    # File lib/sequel/model/associations.rb, line 267
    def setter_method
      :"#{self[:name]}="
    end

slice_range() click to toggle source

The range used for slicing when using the :ruby eager limit strategy.

    # File lib/sequel/model/associations.rb, line 272
    def slice_range
      limit, offset = limit_and_offset
      if limit || offset
        (offset||0)..(limit ? (offset||0)+limit-1 : -1)
      end
    end

[Validate]

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