Class: ActiveRecord::PredicateBuilder
- Defined in:
- activerecord/lib/active_record/relation/predicate_builder.rb,
activerecord/lib/active_record/relation/predicate_builder/base_handler.rb,
activerecord/lib/active_record/relation/predicate_builder/array_handler.rb,
activerecord/lib/active_record/relation/predicate_builder/range_handler.rb,
activerecord/lib/active_record/relation/predicate_builder/relation_handler.rb,
activerecord/lib/active_record/relation/predicate_builder/basic_object_handler.rb,
activerecord/lib/active_record/relation/predicate_builder/association_query_value.rb,
activerecord/lib/active_record/relation/predicate_builder/polymorphic_array_value.rb
Overview
:nodoc:
Defined Under Namespace
Classes: ArrayHandler, AssociationQueryValue, BaseHandler, BasicObjectHandler, PolymorphicArrayValue, RangeHandler, RelationHandler
Class Method Summary collapse
Instance Method Summary collapse
- #build(attribute, value) ⇒ Object
- #build_bind_attribute(column_name, value) ⇒ Object
- #build_from_hash(attributes) ⇒ Object
-
#initialize(table) ⇒ PredicateBuilder
constructor
A new instance of PredicateBuilder.
-
#register_handler(klass, handler) ⇒ Object
Define how a class is converted to Arel nodes when passed to
where
.
Constructor Details
#initialize(table) ⇒ PredicateBuilder
Returns a new instance of PredicateBuilder.
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# File 'activerecord/lib/active_record/relation/predicate_builder.rb', line 7 def initialize(table) @table = table @handlers = [] register_handler(BasicObject, BasicObjectHandler.new(self)) register_handler(Base, BaseHandler.new(self)) register_handler(Range, RangeHandler.new(self)) register_handler(Relation, RelationHandler.new) register_handler(Array, ArrayHandler.new(self)) register_handler(Set, ArrayHandler.new(self)) end |
Class Method Details
.references(attributes) ⇒ Object
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# File 'activerecord/lib/active_record/relation/predicate_builder.rb', line 24 def self.references(attributes) attributes.map do |key, value| if value.is_a?(Hash) key else key = key.to_s key.split(".").first if key.include?(".") end end.compact end |
Instance Method Details
#build(attribute, value) ⇒ Object
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# File 'activerecord/lib/active_record/relation/predicate_builder.rb', line 50 def build(attribute, value) if table.type(attribute.name).force_equality?(value) bind = build_bind_attribute(attribute.name, value) attribute.eq(bind) else handler_for(value).call(attribute, value) end end |
#build_bind_attribute(column_name, value) ⇒ Object
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# File 'activerecord/lib/active_record/relation/predicate_builder.rb', line 59 def build_bind_attribute(column_name, value) attr = Relation::QueryAttribute.new(column_name.to_s, value, table.type(column_name)) Arel::Nodes::BindParam.new(attr) end |
#build_from_hash(attributes) ⇒ Object
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# File 'activerecord/lib/active_record/relation/predicate_builder.rb', line 19 def build_from_hash(attributes) attributes = convert_dot_notation_to_hash(attributes) (attributes) end |
#register_handler(klass, handler) ⇒ Object
Define how a class is converted to Arel nodes when passed to where
. The handler can be any object that responds to call
, and will be used for any value that === the class given. For example:
MyCustomDateRange = Struct.new(:start, :end)
handler = proc do |column, range|
Arel::Nodes::Between.new(column,
Arel::Nodes::And.new([range.start, range.end])
)
end
ActiveRecord::PredicateBuilder.new("users").register_handler(MyCustomDateRange, handler)
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# File 'activerecord/lib/active_record/relation/predicate_builder.rb', line 46 def register_handler(klass, handler) @handlers.unshift([klass, handler]) end |