Class: PG::TypeMapByClass

Inherits:

TypeMap

• Object
• TypeMap
• PG::TypeMapByClass

Includes:

PG::TypeMap::DefaultTypeMappable

Defined in:

ext/pg_type_map_by_class.c,
ext/pg_type_map_by_class.c

Overview

This type map casts values based on the class or the ancestors of the given value to be sent.

This type map is usable for type casting query bind parameters and COPY data for PG::Connection#put_copy_data . Therefore only encoders might be assigned by the #[]= method.

Direct Known Subclasses

BasicTypeMapForQueries

Instance Method Summary

• #[](klass) ⇒ Object

  Returns the encoder object for the given class.

• #[]=(klass, coder) ⇒ Object

  Assigns a new PG::Coder object to the type map.

• #coders ⇒ Hash

  Returns all classes and their assigned encoder object.

Methods included from PG::TypeMap::DefaultTypeMappable

#default_type_map, #default_type_map=, #with_default_type_map

Instance Method Details

#[](klass) ⇒ Object

Returns the encoder object for the given class

# File 'ext/pg_type_map_by_class.c', line 196

static VALUE
pg_tmbk_aref( VALUE self, VALUE klass )
{
	t_tmbk *this = DATA_PTR( self );

	return rb_hash_lookup(this->klass_to_coder, klass);
}

#[]=(klass, coder) ⇒ Object

Assigns a new PG::Coder object to the type map. The encoder is chosen for all values that are a kind of the given class .

coder can be one of the following:

• nil - Values are forwarded to the #default_type_map .

• a PG::Coder - Values are encoded by the given encoder

• a Symbol - The method of this type map (or a derivation) that is called for each value to sent. It must return a PG::Coder or nil .

• a Proc - The Proc object is called for each value. It must return a PG::Coder or nil .

# File 'ext/pg_type_map_by_class.c', line 172

static VALUE
pg_tmbk_aset( VALUE self, VALUE klass, VALUE coder )
{
	t_tmbk *this = DATA_PTR( self );

	if(NIL_P(coder)){
		rb_hash_delete( this->klass_to_coder, klass );
	}else{
		rb_hash_aset( this->klass_to_coder, klass, coder );
	}

	/* The cache lookup key can be a derivation of the klass.
	 * So we can not expire the cache selectively. */
	memset( &this->cache_row, 0, sizeof(this->cache_row) );

	return coder;
}

#coders ⇒ Hash

Returns all classes and their assigned encoder object.

Returns:

• (Hash)

# File 'ext/pg_type_map_by_class.c', line 210

static VALUE
pg_tmbk_coders( VALUE self )
{
	t_tmbk *this = DATA_PTR( self );

	return rb_obj_freeze(rb_hash_dup(this->klass_to_coder));
}