Class BelongsTo
Represents an 1 - N relationship where the source side of the relation is related to only one record in the target table.
An example of a BelongsTo association would be Article belongs to Author.
Constants summary
Properties summary
-
$_bindingKey protected
string|string[]
The field name in the owning side table that is used to match with the foreignKey
-
$_cascadeCallbacks protected
bool
Whether or not cascaded deletes should also fire callbacks.
-
$_className protected
string
The class name of the target table object
-
$_conditions protected
array|\Closure
A list of conditions to be always included when fetching records from the target association
-
$_dependent protected
bool
Whether the records on the target table are dependent on the source table, often used to indicate that records should be removed if the owning record in the source table is deleted.
-
$_finder protected
string|array
The default finder name to use for fetching rows from the target table With array value, finder name and default options are allowed.
-
$_foreignKey protected
string|string[]
The name of the field representing the foreign key to the table to load
-
$_joinType protected
string
The type of join to be used when adding the association to a query
-
$_name protected
string
Name given to the association, it usually represents the alias assigned to the target associated table
-
$_propertyName protected
string
The property name that should be filled with data from the target table in the source table record.
-
$_sourceTable protected
\Cake\ORM\Table
Source table instance
-
$_strategy protected
string
The strategy name to be used to fetch associated records. Some association types might not implement but one strategy to fetch records.
-
$_tableLocator protected
\Cake\ORM\Locator\LocatorInterface|null
Table locator instance
-
$_targetTable protected
\Cake\ORM\Table
Target table instance
-
$_validStrategies protected
string[]
Valid strategies for this type of association
Method Summary
-
__call() public
Proxies method calls to the target table.
-
__construct() public
Constructor. Subclasses can override _options function to get the original list of passed options if expecting any other special key
-
__get() public
Proxies property retrieval to the target table. This is handy for getting this association's associations
-
__isset() public
Proxies the isset call to the target table. This is handy to check if the target table has another association with the passed name
-
_appendFields() protected
Helper function used to conditionally append fields to the select clause of a query from the fields found in another query object.
-
_appendNotMatching() protected
Conditionally adds a condition to the passed Query that will make it find records where there is no match with this association.
-
_bindNewAssociations() protected
Applies all attachable associations to
$query
out of the containments found in the$surrogate
query. -
_camelize() protected
Creates a camelized version of $name
-
_dispatchBeforeFind() protected
Triggers beforeFind on the target table for the query this association is attaching to
-
_entityName() protected
Creates the proper entity name (singular) for the specified name
-
_extractFinder() protected
Helper method to infer the requested finder and its options.
-
_fixtureName() protected
Creates a fixture name
-
_formatAssociationResults() protected
Adds a formatter function to the passed
$query
if the$surrogate
query declares any other formatter. Since the$surrogate
query correspond to the associated target table, the resulting formatter will be the result of applying the surrogate formatters to only the property corresponding to such table. -
_joinCondition() protected
Returns a single or multiple conditions to be appended to the generated join clause for getting the results on the target table.
-
_modelKey() protected
Creates the proper underscored model key for associations
-
_modelNameFromKey() protected
Creates the proper model name from a foreign key
-
_options() protected
Override this function to initialize any concrete association class, it will get passed the original list of options used in the constructor
-
_pluginNamespace() protected
Return plugin's namespace
-
_pluginPath() protected
Find the correct path for a plugin. Scans $pluginPaths for the plugin you want.
-
_pluralHumanName() protected
Creates the plural human name used in views
-
_propertyName() protected
Returns default property name based on association name.
-
_singularHumanName() protected
Creates the singular human name used in views
-
_singularName() protected
Creates the singular name for use in views.
-
_variableName() protected
Creates the plural variable name for views
-
attachTo() public
Alters a Query object to include the associated target table data in the final result
-
canBeJoined() public
Whether this association can be expressed directly in a query join
-
cascadeDelete() public
Handle cascading deletes.
-
defaultRowValue() public
Returns a modified row after appending a property for this association with the default empty value according to whether the association was joined or fetched externally.
-
deleteAll() public
Proxies the delete operation to the target table's deleteAll method
-
eagerLoader() public
Eager loads a list of records in the target table that are related to another set of records in the source table. Source records can specified in two ways: first one is by passing a Query object setup to find on the source table and the other way is by explicitly passing an array of primary key values from the source table.
-
exists() public
Proxies the operation to the target table's exists method after appending the default conditions for this association
-
find() public
Proxies the finding operation to the target table's find method and modifies the query accordingly based of this association configuration
-
getBindingKey() public
Gets the name of the field representing the binding field with the target table.
-
getCascadeCallbacks() public
Gets whether or not cascaded deletes should also fire callbacks.
-
getClassName() public
Gets the class name of the target table object.
-
getConditions() public
Gets a list of conditions to be always included when fetching records from the target association.
-
getDependent() public
Sets whether the records on the target table are dependent on the source table.
-
getFinder() public
Gets the default finder to use for fetching rows from the target table.
-
getForeignKey() public
Gets the name of the field representing the foreign key to the target table.
-
getJoinType() public
Gets the type of join to be used when adding the association to a query.
-
getName() public
Gets the name for this association, usually the alias assigned to the target associated table
-
getProperty() public
Gets the property name that should be filled with data from the target table in the source table record.
-
getSource() public
Gets the table instance for the source side of the association.
-
getStrategy() public
Gets the strategy name to be used to fetch associated records. Keep in mind that some association types might not implement but a default strategy, rendering any changes to this setting void.
-
getTableLocator() public
Gets the table locator.
-
getTarget() public
Gets the table instance for the target side of the association.
-
isOwningSide() public
Returns whether or not the passed table is the owning side for this association. This means that rows in the 'target' table would miss important or required information if the row in 'source' did not exist.
-
requiresKeys() public
Returns true if the eager loading process will require a set of the owning table's binding keys in order to use them as a filter in the finder query.
-
saveAssociated() public
Takes an entity from the source table and looks if there is a field matching the property name for this association. The found entity will be saved on the target table for this association by passing supplied
$options
-
setBindingKey() public
Sets the name of the field representing the binding field with the target table.
-
setCascadeCallbacks() public
Sets whether or not cascaded deletes should also fire callbacks.
-
setClassName() public
Sets the class name of the target table object.
-
setConditions() public
Sets a list of conditions to be always included when fetching records from the target association.
-
setDependent() public
Sets whether the records on the target table are dependent on the source table.
-
setFinder() public
Sets the default finder to use for fetching rows from the target table.
-
setForeignKey() public
Sets the name of the field representing the foreign key to the target table.
-
setJoinType() public
Sets the type of join to be used when adding the association to a query.
-
setName() public
Sets the name for this association, usually the alias assigned to the target associated table
-
setProperty() public
Sets the property name that should be filled with data from the target table in the source table record.
-
setSource() public
Sets the table instance for the source side of the association.
-
setStrategy() public
Sets the strategy name to be used to fetch associated records. Keep in mind that some association types might not implement but a default strategy, rendering any changes to this setting void.
-
setTableLocator() public
Sets the table locator.
-
setTarget() public
Sets the table instance for the target side of the association.
-
transformRow() public
Correctly nests a result row associated values into the correct array keys inside the source results.
-
type() public
Get the relationship type.
-
updateAll() public
Proxies the update operation to the target table's updateAll method
Method Detail
__call() public ¶
__call(mixed $method, mixed $argument)
Proxies method calls to the target table.
Parameters
-
string
$method name of the method to be invoked
-
array
$argument List of arguments passed to the function
Returns
mixed
Throws
BadMethodCallException
__construct() public ¶
__construct(string $alias, array $options)
Constructor. Subclasses can override _options function to get the original list of passed options if expecting any other special key
Parameters
-
string
$alias The name given to the association
-
array
$options optional A list of properties to be set on this object
__get() public ¶
__get(mixed $property)
Proxies property retrieval to the target table. This is handy for getting this association's associations
Parameters
-
string
$property the property name
Returns
\Cake\ORM\Association
Throws
RuntimeException
if no association with such name exists
__isset() public ¶
__isset(mixed $property)
Proxies the isset call to the target table. This is handy to check if the target table has another association with the passed name
Parameters
-
string
$property the property name
Returns
bool
true if the property exists
_appendFields() protected ¶
_appendFields(\Cake\ORM\Query $query, \Cake\ORM\Query $surrogate, array $options)
Helper function used to conditionally append fields to the select clause of a query from the fields found in another query object.
Parameters
-
\Cake\ORM\Query
$query the query that will get the fields appended to
-
\Cake\ORM\Query
$surrogate the query having the fields to be copied from
-
array
$options options passed to the method
attachTo
_appendNotMatching() protected ¶
_appendNotMatching(\Cake\ORM\Query $query, array $options)
Conditionally adds a condition to the passed Query that will make it find records where there is no match with this association.
Parameters
-
\Cake\ORM\Query
$query The query to modify
-
array
$options Options array containing the
negateMatch
key.
_bindNewAssociations() protected ¶
_bindNewAssociations(\Cake\ORM\Query $query, \Cake\ORM\Query $surrogate, array $options)
Applies all attachable associations to $query
out of the containments found
in the $surrogate
query.
Copies all contained associations from the $surrogate
query into the
passed $query
. Containments are altered so that they respect the associations
chain from which they originated.
Parameters
-
\Cake\ORM\Query
$query the query that will get the associations attached to
-
\Cake\ORM\Query
$surrogate the query having the containments to be attached
-
array
$options options passed to the method
attachTo
_camelize() protected ¶
_camelize(string $name)
Creates a camelized version of $name
Parameters
-
string
$name name
Returns
string
Camelized name
_dispatchBeforeFind() protected ¶
_dispatchBeforeFind(\Cake\ORM\Query $query)
Triggers beforeFind on the target table for the query this association is attaching to
Parameters
-
\Cake\ORM\Query
$query the query this association is attaching itself to
_entityName() protected ¶
_entityName(string $name)
Creates the proper entity name (singular) for the specified name
Parameters
-
string
$name Name
Returns
string
Camelized and plural model name
_extractFinder() protected ¶
_extractFinder(mixed $finderData)
Helper method to infer the requested finder and its options.
Returns the inferred options from the finder $type.
Examples:
The following will call the finder 'translations' with the value of the finder as its options: $query->contain(['Comments' => ['finder' => ['translations']]]); $query->contain(['Comments' => ['finder' => ['translations' => []]]]); $query->contain(['Comments' => ['finder' => ['translations' => ['locales' => ['en_US']]]]]);
Parameters
-
string|array
$finderData The finder name or an array having the name as key and options as value.
Returns
array
_fixtureName() protected ¶
_fixtureName(string $name)
Creates a fixture name
Parameters
-
string
$name Model class name
Returns
string
Singular model key
_formatAssociationResults() protected ¶
_formatAssociationResults(\Cake\ORM\Query $query, \Cake\ORM\Query $surrogate, array $options)
Adds a formatter function to the passed $query
if the $surrogate
query
declares any other formatter. Since the $surrogate
query correspond to
the associated target table, the resulting formatter will be the result of
applying the surrogate formatters to only the property corresponding to
such table.
Parameters
-
\Cake\ORM\Query
$query the query that will get the formatter applied to
-
\Cake\ORM\Query
$surrogate the query having formatters for the associated target table.
-
array
$options options passed to the method
attachTo
_joinCondition() protected ¶
_joinCondition(array $options)
Returns a single or multiple conditions to be appended to the generated join clause for getting the results on the target table.
Parameters
-
array
$options list of options passed to attachTo method
Returns
\Cake\Database\Expression\IdentifierExpression[]
Throws
RuntimeException
if the number of columns in the foreignKey do not match the number of columns in the target table primaryKey
_modelKey() protected ¶
_modelKey(string $name)
Creates the proper underscored model key for associations
If the input contains a dot, assume that the right side is the real table name.
Parameters
-
string
$name Model class name
Returns
string
Singular model key
_modelNameFromKey() protected ¶
_modelNameFromKey(string $key)
Creates the proper model name from a foreign key
Parameters
-
string
$key Foreign key
Returns
string
Model name
_options() protected ¶
_options(array $options)
Override this function to initialize any concrete association class, it will get passed the original list of options used in the constructor
Parameters
-
array
$options List of options used for initialization
_pluginNamespace() protected ¶
_pluginNamespace(string $pluginName)
Return plugin's namespace
Parameters
-
string
$pluginName Plugin name
Returns
string
Plugin's namespace
_pluginPath() protected ¶
_pluginPath(string $pluginName)
Find the correct path for a plugin. Scans $pluginPaths for the plugin you want.
Parameters
-
string
$pluginName Name of the plugin you want ie. DebugKit
Returns
string
path path to the correct plugin.
_pluralHumanName() protected ¶
_pluralHumanName(string $name)
Creates the plural human name used in views
Parameters
-
string
$name Controller name
Returns
string
Plural human name
_propertyName() protected ¶
_propertyName()
Returns default property name based on association name.
Returns
string
_singularHumanName() protected ¶
_singularHumanName(string $name)
Creates the singular human name used in views
Parameters
-
string
$name Controller name
Returns
string
Singular human name
_singularName() protected ¶
_singularName(string $name)
Creates the singular name for use in views.
Parameters
-
string
$name Name to use
Returns
string
Variable name
_variableName() protected ¶
_variableName(string $name)
Creates the plural variable name for views
Parameters
-
string
$name Name to use
Returns
string
Plural name for views
attachTo() public ¶
attachTo(\Cake\ORM\Query $query, array $options)
Alters a Query object to include the associated target table data in the final result
The options array accept the following keys:
- includeFields: Whether to include target model fields in the result or not
- foreignKey: The name of the field to use as foreign key, if false none will be used
- conditions: array with a list of conditions to filter the join with, this will be merged with any conditions originally configured for this association
- fields: a list of fields in the target table to include in the result
- type: The type of join to be used (e.g. INNER) the records found on this association
- aliasPath: A dot separated string representing the path of association names followed from the passed query main table to this association.
- propertyPath: A dot separated string representing the path of association properties to be followed from the passed query main entity to this association
- joinType: The SQL join type to use in the query.
- negateMatch: Will append a condition to the passed query for excluding matches. with this association.
Parameters
-
\Cake\ORM\Query
$query the query to be altered to include the target table data
-
array
$options optional Any extra options or overrides to be taken in account
Throws
RuntimeException
if the query builder passed does not return a query object
canBeJoined() public ¶
canBeJoined(array $options)
Whether this association can be expressed directly in a query join
Parameters
-
array
$options optional custom options key that could alter the return value
Returns
bool
cascadeDelete() public ¶
cascadeDelete(\Cake\Datasource\EntityInterface $entity, array $options)
Handle cascading deletes.
BelongsTo associations are never cleared in a cascading delete scenario.
Parameters
-
\Cake\Datasource\EntityInterface
$entity The entity that started the cascaded delete.
-
array
$options optional The options for the original delete.
Returns
bool
Success.
defaultRowValue() public ¶
defaultRowValue(array $row, bool $joined)
Returns a modified row after appending a property for this association with the default empty value according to whether the association was joined or fetched externally.
Parameters
-
array
$row The row to set a default on.
-
bool
$joined Whether or not the row is a result of a direct join with this association
Returns
array
deleteAll() public ¶
deleteAll(mixed $conditions)
Proxies the delete operation to the target table's deleteAll method
Parameters
-
mixed
$conditions Conditions to be used, accepts anything Query::where() can take.
Returns
int
Returns the number of affected rows.
See Also
eagerLoader() public ¶
eagerLoader(array $options)
Eager loads a list of records in the target table that are related to another set of records in the source table. Source records can specified in two ways: first one is by passing a Query object setup to find on the source table and the other way is by explicitly passing an array of primary key values from the source table.
The required way of passing related source records is controlled by "strategy" When the subquery strategy is used it will require a query on the source table. When using the select strategy, the list of primary keys will be used.
Returns a closure that should be run for each record returned in a specific Query. This callable will be responsible for injecting the fields that are related to each specific passed row.
Options array accepts the following keys:
- query: Query object setup to find the source table records
- keys: List of primary key values from the source table
- foreignKey: The name of the field used to relate both tables
- conditions: List of conditions to be passed to the query where() method
- sort: The direction in which the records should be returned
- fields: List of fields to select from the target table
- contain: List of related tables to eager load associated to the target table
- strategy: The name of strategy to use for finding target table records
- nestKey: The array key under which results will be found when transforming the row
Parameters
-
array
$options The options for eager loading.
Returns
\Closure
exists() public ¶
exists(mixed $conditions)
Proxies the operation to the target table's exists method after appending the default conditions for this association
Parameters
-
array|\Closure|\Cake\Database\ExpressionInterface
$conditions The conditions to use for checking if any record matches.
Returns
bool
See Also
find() public ¶
find(mixed $type, array $options)
Proxies the finding operation to the target table's find method and modifies the query accordingly based of this association configuration
Parameters
-
string|array|null
$type optional the type of query to perform, if an array is passed, it will be interpreted as the
$options
parameter-
array
$options optional The options to for the find
Returns
\Cake\ORM\Query
See Also
getBindingKey() public ¶
getBindingKey()
Gets the name of the field representing the binding field with the target table.
When not manually specified the primary key of the owning side table is used.
Returns
string|string[]
getCascadeCallbacks() public ¶
getCascadeCallbacks()
Gets whether or not cascaded deletes should also fire callbacks.
Returns
bool
getClassName() public ¶
getClassName()
Gets the class name of the target table object.
Returns
string
getConditions() public ¶
getConditions()
Gets a list of conditions to be always included when fetching records from the target association.
Returns
array|\Closure
See Also
for examples on the format of the array
getDependent() public ¶
getDependent()
Sets whether the records on the target table are dependent on the source table.
This is primarily used to indicate that records should be removed if the owning record in the source table is deleted.
Returns
bool
getFinder() public ¶
getFinder()
Gets the default finder to use for fetching rows from the target table.
Returns
string|array
getForeignKey() public ¶
getForeignKey()
Gets the name of the field representing the foreign key to the target table.
Returns
string|string[]
getJoinType() public ¶
getJoinType()
Gets the type of join to be used when adding the association to a query.
Returns
string
getName() public ¶
getName()
Gets the name for this association, usually the alias assigned to the target associated table
Returns
string
getProperty() public ¶
getProperty()
Gets the property name that should be filled with data from the target table in the source table record.
Returns
string
getSource() public ¶
getSource()
Gets the table instance for the source side of the association.
Returns
\Cake\ORM\Table
getStrategy() public ¶
getStrategy()
Gets the strategy name to be used to fetch associated records. Keep in mind that some association types might not implement but a default strategy, rendering any changes to this setting void.
Returns
string
getTableLocator() public ¶
getTableLocator()
Gets the table locator.
Returns
\Cake\ORM\Locator\LocatorInterface
getTarget() public ¶
getTarget()
Gets the table instance for the target side of the association.
Returns
\Cake\ORM\Table
isOwningSide() public ¶
isOwningSide(\Cake\ORM\Table $side)
Returns whether or not the passed table is the owning side for this association. This means that rows in the 'target' table would miss important or required information if the row in 'source' did not exist.
Parameters
-
\Cake\ORM\Table
$side The potential Table with ownership
Returns
bool
requiresKeys() public ¶
requiresKeys(array $options)
Returns true if the eager loading process will require a set of the owning table's binding keys in order to use them as a filter in the finder query.
Parameters
-
array
$options optional The options containing the strategy to be used.
Returns
bool
true if a list of keys will be required
saveAssociated() public ¶
saveAssociated(\Cake\Datasource\EntityInterface $entity, array $options)
Takes an entity from the source table and looks if there is a field
matching the property name for this association. The found entity will be
saved on the target table for this association by passing supplied
$options
Parameters
-
\Cake\Datasource\EntityInterface
$entity an entity from the source table
-
array
$options optional options to be passed to the save method in the target table
Returns
\Cake\Datasource\EntityInterface|false
false if $entity could not be saved, otherwise it returns the saved entity
See Also
setBindingKey() public ¶
setBindingKey(mixed $key)
Sets the name of the field representing the binding field with the target table.
When not manually specified the primary key of the owning side table is used.
Parameters
-
string|string[]
$key the table field or fields to be used to link both tables together
Returns
$this
setCascadeCallbacks() public ¶
setCascadeCallbacks(bool $cascadeCallbacks)
Sets whether or not cascaded deletes should also fire callbacks.
Parameters
-
bool
$cascadeCallbacks cascade callbacks switch value
Returns
$this
setClassName() public ¶
setClassName(string $className)
Sets the class name of the target table object.
Parameters
-
string
$className Class name to set.
Returns
$this
Throws
InvalidArgumentException
In case the class name is set after the target table has been resolved, and it doesn't match the target table's class name.
setConditions() public ¶
setConditions(mixed $conditions)
Sets a list of conditions to be always included when fetching records from the target association.
Parameters
-
array|\Closure
$conditions list of conditions to be used
Returns
\Cake\ORM\Association
See Also
for examples on the format of the array
setDependent() public ¶
setDependent(bool $dependent)
Sets whether the records on the target table are dependent on the source table.
This is primarily used to indicate that records should be removed if the owning record in the source table is deleted.
If no parameters are passed the current setting is returned.
Parameters
-
bool
$dependent Set the dependent mode. Use null to read the current state.
Returns
$this
setFinder() public ¶
setFinder(mixed $finder)
Sets the default finder to use for fetching rows from the target table.
Parameters
-
string|array
$finder the finder name to use or array of finder name and option.
Returns
$this
setForeignKey() public ¶
setForeignKey(mixed $key)
Sets the name of the field representing the foreign key to the target table.
Parameters
-
string|string[]
$key the key or keys to be used to link both tables together
Returns
$this
setJoinType() public ¶
setJoinType(string $type)
Sets the type of join to be used when adding the association to a query.
Parameters
-
string
$type the join type to be used (e.g. INNER)
Returns
$this
setName() public ¶
setName(string $name)
Sets the name for this association, usually the alias assigned to the target associated table
Parameters
-
string
$name Name to be assigned
Returns
$this
setProperty() public ¶
setProperty(string $name)
Sets the property name that should be filled with data from the target table in the source table record.
Parameters
-
string
$name The name of the association property. Use null to read the current value.
Returns
$this
setSource() public ¶
setSource(\Cake\ORM\Table $table)
Sets the table instance for the source side of the association.
Parameters
-
\Cake\ORM\Table
$table the instance to be assigned as source side
Returns
$this
setStrategy() public ¶
setStrategy(string $name)
Sets the strategy name to be used to fetch associated records. Keep in mind that some association types might not implement but a default strategy, rendering any changes to this setting void.
Parameters
-
string
$name The strategy type. Use null to read the current value.
Returns
$this
Throws
InvalidArgumentException
When an invalid strategy is provided.
setTableLocator() public ¶
setTableLocator(\Cake\ORM\Locator\LocatorInterface $tableLocator)
Sets the table locator.
Parameters
-
\Cake\ORM\Locator\LocatorInterface
$tableLocator LocatorInterface instance.
Returns
$this
setTarget() public ¶
setTarget(\Cake\ORM\Table $table)
Sets the table instance for the target side of the association.
Parameters
-
\Cake\ORM\Table
$table the instance to be assigned as target side
Returns
$this
transformRow() public ¶
transformRow(array $row, string $nestKey, bool $joined, ?string $targetProperty)
Correctly nests a result row associated values into the correct array keys inside the source results.
Parameters
-
array
$row The row to transform
-
string
$nestKey The array key under which the results for this association should be found
-
bool
$joined Whether or not the row is a result of a direct join with this association
-
string|null
$targetProperty optional The property name in the source results where the association data shuld be nested in. Will use the default one if not provided.
Returns
array
updateAll() public ¶
updateAll(array $fields, mixed $conditions)
Proxies the update operation to the target table's updateAll method
Parameters
-
array
$fields A hash of field => new value.
-
mixed
$conditions Conditions to be used, accepts anything Query::where() can take.
Returns
int
Count Returns the affected rows.
See Also
Property Detail
$_bindingKey ¶ protected
The field name in the owning side table that is used to match with the foreignKey
Type
string|string[]
$_cascadeCallbacks ¶ protected
Whether or not cascaded deletes should also fire callbacks.
Type
bool
$_conditions ¶ protected
A list of conditions to be always included when fetching records from the target association
Type
array|\Closure
$_dependent ¶ protected
Whether the records on the target table are dependent on the source table, often used to indicate that records should be removed if the owning record in the source table is deleted.
Type
bool
$_finder ¶ protected
The default finder name to use for fetching rows from the target table With array value, finder name and default options are allowed.
Type
string|array
$_foreignKey ¶ protected
The name of the field representing the foreign key to the table to load
Type
string|string[]
$_joinType ¶ protected
The type of join to be used when adding the association to a query
Type
string
$_name ¶ protected
Name given to the association, it usually represents the alias assigned to the target associated table
Type
string
$_propertyName ¶ protected
The property name that should be filled with data from the target table in the source table record.
Type
string
$_strategy ¶ protected
The strategy name to be used to fetch associated records. Some association types might not implement but one strategy to fetch records.
Type
string