Sequel::Model instance methods that implement basic model functionality.
-
All of the model before/after/around hooks are implemented as instance methods that are called by Sequel when the appropriate action occurs. For example, when destroying a model object, Sequel will call
around_destroy
, which will callbefore_destroy
, do the destroy, and then callafter_destroy
. -
The following instance_methods all call the class method of the same name: columns, db, primary_key, db_schema.
-
The following accessor methods are defined via metaprogramming: raise_on_save_failure, raise_on_typecast_failure, require_modification, strict_param_setting, typecast_empty_string_to_nil, typecast_on_assignment, and use_transactions. The setter methods will change the setting for the instance, and the getter methods will check for an instance setting, then try the class setting if no instance setting has been set.
Methods
Public Class
Public Instance
- ==
- ===
- []
- []=
- autoincrementing_primary_key
- cancel_action
- changed_columns
- delete
- destroy
- each
- eql?
- errors
- exists?
- extend
- freeze
- hash
- id
- inspect
- keys
- lock!
- marshallable!
- modified!
- modified?
- new?
- pk
- pk_hash
- qualified_pk_hash
- refresh
- reload
- save
- save_changes
- set
- set_fields
- set_server
- singleton_method_added
- this
- update
- update_fields
- valid?
- validate
- values
Attributes
to_hash | [R] |
The hash of attribute values. Keys are symbols with the names of the underlying database columns. The returned hash is a reference to the receiver's values hash, and modifying it will also modify the receiver's values. Artist.new(name: 'Bob').values # => {:name=>'Bob'} Artist[1].values # => {:id=>1, :name=>'Jim', ...} |
values | [R] |
The hash of attribute values. Keys are symbols with the names of the underlying database columns. The returned hash is a reference to the receiver's values hash, and modifying it will also modify the receiver's values. Artist.new(name: 'Bob').values # => {:name=>'Bob'} Artist[1].values # => {:id=>1, :name=>'Jim', ...} |
Public Class methods
Creates new instance and passes the given values to set. If a block is given, yield the instance to the block.
Arguments:
values |
should be a hash to pass to set. |
Artist.new(name: 'Bob') Artist.new do |a| a.name = 'Bob' end
# File lib/sequel/model/base.rb, line 1057 def initialize(values = {}) @values = {} @new = true @modified = true initialize_set(values) _changed_columns.clear yield self if block_given? end
Public Instance methods
Alias of eql?
# File lib/sequel/model/base.rb, line 1094 def ==(obj) eql?(obj) end
If pk is not nil, true only if the objects have the same class and pk. If pk is nil, false.
Artist[1] === Artist[1] # true Artist.new === Artist.new # false Artist[1].set(:name=>'Bob') == Artist[1] # => true
# File lib/sequel/model/base.rb, line 1104 def ===(obj) pk.nil? ? false : (obj.class == model) && (obj.pk == pk) end
Returns value of the column's attribute.
Artist[1][:id] #=> 1
# File lib/sequel/model/base.rb, line 1069 def [](column) @values[column] end
Sets the value for the given column. If typecasting is enabled for this object, typecast the value based on the column's type. If this is a new record or the typecasted value isn't the same as the current value for the column, mark the column as changed.
a = Artist.new a[:name] = 'Bob' a.values #=> {:name=>'Bob'}
# File lib/sequel/model/base.rb, line 1081 def []=(column, value) # If it is new, it doesn't have a value yet, so we should # definitely set the new value. # If the column isn't in @values, we can't assume it is # NULL in the database, so assume it has changed. v = typecast_value(column, value) vals = @values if new? || !vals.include?(column) || v != (c = vals[column]) || v.class != c.class change_column_value(column, v) end end
The autoincrementing primary key for this model object. Should be overridden if you have a composite primary key with one part of it being autoincrementing.
# File lib/sequel/model/base.rb, line 1119 def autoincrementing_primary_key primary_key end
Cancel the current action. Should be called in before hooks to halt the
processing of the action. If a msg
argument is given and the
model instance is configured to raise exceptions on failure, sets the
message to use for the raised HookFailed
exception.
# File lib/sequel/model/base.rb, line 1127 def cancel_action(msg=nil) raise_hook_failure(msg) end
The columns that have been updated. This isn't completely accurate, as it could contain columns whose values have not changed.
a = Artist[1] a.changed_columns # => [] a.name = 'Bob' a.changed_columns # => [:name]
# File lib/sequel/model/base.rb, line 1138 def changed_columns _changed_columns end
Deletes and returns self
. Does not run destroy hooks. Look
into using destroy
instead.
Artist[1].delete # DELETE FROM artists WHERE (id = 1) # => #<Artist {:id=>1, ...}>
# File lib/sequel/model/base.rb, line 1147 def delete raise Sequel::Error, "can't delete frozen object" if frozen? _delete self end
Like delete but runs hooks before and after delete. Uses a transaction if use_transactions is true or if the :transaction option is given and true.
Artist[1].destroy # BEGIN; DELETE FROM artists WHERE (id = 1); COMMIT; # => #<Artist {:id=>1, ...}>
# File lib/sequel/model/base.rb, line 1159 def destroy(opts = OPTS) raise Sequel::Error, "can't destroy frozen object" if frozen? checked_save_failure(opts){checked_transaction(opts){_destroy(opts)}} end
Iterates through all of the current values using each.
Album[1].each{|k, v| puts "#{k} => #{v}"} # id => 1 # name => 'Bob'
# File lib/sequel/model/base.rb, line 1169 def each(&block) @values.each(&block) end
Compares model instances by values.
Artist[1] == Artist[1] # => true Artist.new == Artist.new # => true Artist[1].set(:name=>'Bob') == Artist[1] # => false
# File lib/sequel/model/base.rb, line 1178 def eql?(obj) (obj.class == model) && (obj.values == @values) end
Returns the validation errors associated with this object. See
Errors
.
# File lib/sequel/model/base.rb, line 1184 def errors @errors ||= errors_class.new end
Returns true when current instance exists, false otherwise. Generally an object that isn't new will exist unless it has been deleted. Uses a database query to check for existence, unless the model object is new, in which case this is always false.
Artist[1].exists? # SELECT 1 FROM artists WHERE (id = 1) # => true Artist.new.exists? # => false
# File lib/sequel/model/base.rb, line 1198 def exists? new? ? false : !this.get(SQL::AliasedExpression.new(1, :one)).nil? end
Ignore the model's setter method cache when this instances extends a module, as the module may contain setter methods.
# File lib/sequel/model/base.rb, line 1204 def extend(mod) @singleton_setter_added = true super end
Freeze the object in such a way that it is still usable but not modifiable. Once an object is frozen, you cannot modify it's values, #changed_columns, errors, or dataset.
# File lib/sequel/model/base.rb, line 1212 def freeze values.freeze _changed_columns.freeze unless errors.frozen? validate errors.freeze end this if !new? && model.primary_key super end
Value that should be unique for objects with the same class and pk (if pk is not nil), or the same class and values (if pk is nil).
Artist[1].hash == Artist[1].hash # true Artist[1].set(name: 'Bob').hash == Artist[1].hash # true Artist.new.hash == Artist.new.hash # true Artist.new(name: 'Bob').hash == Artist.new.hash # false
# File lib/sequel/model/base.rb, line 1230 def hash case primary_key when Array [model, !pk.all? ? @values : pk].hash when Symbol [model, pk.nil? ? @values : pk].hash else [model, @values].hash end end
Returns value for the :id attribute, even if the primary key is not id. To
get the primary key value, use pk
.
Artist[1].id # => 1
# File lib/sequel/model/base.rb, line 1245 def id @values[:id] end
Returns a string representation of the model instance including the class name and values.
# File lib/sequel/model/base.rb, line 1251 def inspect "#<#{model.name} @values=#{inspect_values}>" end
Returns the keys in values
. May not include all column names.
Artist.new.keys # => [] Artist.new(name: 'Bob').keys # => [:name] Artist[1].keys # => [:id, :name]
# File lib/sequel/model/base.rb, line 1260 def keys @values.keys end
Refresh this record using for_update
(by default, or the
specified style when given) unless this is a new record. Returns self.
This can be used to make sure no other process is updating the record at
the same time.
If style is a string, it will be used directly. You should never pass a string to this method that is derived from user input, as that can lead to SQL injection.
A symbol may be used for database independent locking behavior, but all supported symbols have separate methods (e.g. for_update).
a = Artist[1] Artist.db.transaction do a.lock! a.update(:name=>'A') end a = Artist[2] Artist.db.transaction do a.lock!('FOR NO KEY UPDATE') a.update(:name=>'B') end
# File lib/sequel/model/base.rb, line 1287 def lock!(style=:update) _refresh(this.lock_style(style)) unless new? self end
Remove elements of the model object that make marshalling fail. Returns self.
a = Artist[1] a.marshallable! Marshal.dump(a)
# File lib/sequel/model/base.rb, line 1297 def marshallable! @this = nil self end
Explicitly mark the object as modified, so
save_changes
/update
will run callbacks even if no
columns have changed.
a = Artist[1] a.save_changes # No callbacks run, as no changes a.modified! a.save_changes # Callbacks run, even though no changes made
If a column is given, specifically marked that column as modified, so that
save_changes
/update
will include that column in
the update. This should be used if you plan on mutating the column value
instead of assigning a new column value:
a.modified!(:name) a.name.gsub!(/[aeou]/, 'i')
# File lib/sequel/model/base.rb, line 1317 def modified!(column=nil) _add_changed_column(column) if column @modified = true end
Whether this object has been modified since last saved, used by #save_changes to determine whether changes should be saved. New values are always considered modified.
a = Artist[1] a.modified? # => false a.set(name: 'Jim') a.modified? # => true
If a column is given, specifically check if the given column has been modified:
a.modified?(:num_albums) # => false a.num_albums = 10 a.modified?(:num_albums) # => true
# File lib/sequel/model/base.rb, line 1337 def modified?(column=nil) if column changed_columns.include?(column) else @modified || !changed_columns.empty? end end
Returns true if the current instance represents a new record.
Artist.new.new? # => true Artist[1].new? # => false
# File lib/sequel/model/base.rb, line 1349 def new? defined?(@new) ? @new : (@new = false) end
Returns the primary key value identifying the model instance. Raises an
Error
if this model does not have a primary key. If the model
has a composite primary key, returns an array of values.
Artist[1].pk # => 1 Artist[[1, 2]].pk # => [1, 2]
# File lib/sequel/model/base.rb, line 1359 def pk raise(Error, "No primary key is associated with this model") unless key = primary_key if key.is_a?(Array) vals = @values key.map{|k| vals[k]} else @values[key] end end
Returns a hash mapping the receivers primary key column(s) to their values.
Artist[1].pk_hash # => {:id=>1} Artist[[1, 2]].pk_hash # => {:id1=>1, :id2=>2}
# File lib/sequel/model/base.rb, line 1373 def pk_hash model.primary_key_hash(pk) end
Returns a hash mapping the receivers qualified primary key column(s) to their values.
Artist[1].qualified_pk_hash # => {Sequel[:artists][:id]=>1} Artist[[1, 2]].qualified_pk_hash # => {Sequel[:artists][:id1]=>1, Sequel[:artists][:id2]=>2}
# File lib/sequel/model/base.rb, line 1383 def qualified_pk_hash(qualifier=model.table_name) model.qualified_primary_key_hash(pk, qualifier) end
Reloads attributes from database and returns self. Also clears all #changed_columns
information. Raises an Error
if the record no longer exists
in the database.
a = Artist[1] a.name = 'Jim' a.refresh a.name # => 'Bob'
# File lib/sequel/model/base.rb, line 1395 def refresh raise Sequel::Error, "can't refresh frozen object" if frozen? _refresh(this) self end
Alias of refresh, but not aliased directly to make overriding in a plugin easier.
# File lib/sequel/model/base.rb, line 1402 def reload refresh end
Creates or updates the record, after making sure the record is valid and before hooks execute successfully. Fails if:
-
the record is not valid, or
-
before_save returns false, or
-
the record is new and before_create returns false, or
-
the record is not new and before_update returns false.
If save
fails and either raise_on_save_failure or the
:raise_on_failure option is true, it raises ValidationFailed or HookFailed. Otherwise it returns nil.
If it succeeds, it returns self.
Takes the following options:
:changed |
save all changed columns, instead of all columns or the columns given |
:columns |
array of specific columns that should be saved. |
:raise_on_failure |
set to true or false to override the current
|
:server |
set the server/shard on the object before saving, and use that server/shard in any transaction. |
:transaction |
set to true or false to override the current |
:validate |
set to false to skip validation |
# File lib/sequel/model/base.rb, line 1431 def save(opts=OPTS) raise Sequel::Error, "can't save frozen object" if frozen? set_server(opts[:server]) if opts[:server] unless checked_save_failure(opts){_valid?(opts)} raise(ValidationFailed.new(self)) if raise_on_failure?(opts) return end checked_save_failure(opts){checked_transaction(opts){_save(opts)}} end
Saves only changed columns if the object has been modified. If the object
has not been modified, returns nil. If unable to save, returns false
unless raise_on_save_failure
is true.
a = Artist[1] a.save_changes # => nil a.name = 'Jim' a.save_changes # UPDATE artists SET name = 'Bob' WHERE (id = 1) # => #<Artist {:id=>1, :name=>'Jim', ...}
# File lib/sequel/model/base.rb, line 1450 def save_changes(opts=OPTS) save(Hash[opts].merge!(:changed=>true)) || false if modified? end
Updates the instance with the supplied values with support for virtual
attributes, raising an exception if a value is used that doesn't have a
setter method (or ignoring it if strict_param_setting =
false
). Does not save the record.
artist.set(name: 'Jim') artist.name # => 'Jim'
# File lib/sequel/model/base.rb, line 1461 def set(hash) set_restricted(hash, :default) end
For each of the fields in the given array fields
, call the
setter method with the value of that hash
entry for the field.
Returns self.
You can provide an options hash, with the following options currently respected:
:missing |
Can be set to :skip to skip missing entries or :raise to raise an Error for missing entries. The default behavior is not to check for missing entries, in which case the default value is used. To be friendly with most web frameworks, the missing check will also check for the string version of the argument in the hash if given a symbol. |
Examples:
artist.set_fields({name: 'Jim'}, [:name]) artist.name # => 'Jim' artist.set_fields({hometown: 'LA'}, [:name]) artist.name # => nil artist.hometown # => 'Sac' artist.name # => 'Jim' artist.set_fields({}, [:name], missing: :skip) artist.name # => 'Jim' artist.name # => 'Jim' artist.set_fields({}, [:name], missing: :raise) # Sequel::Error raised
# File lib/sequel/model/base.rb, line 1491 def set_fields(hash, fields, opts=nil) opts = if opts Hash[model.default_set_fields_options].merge!(opts) else model.default_set_fields_options end case missing = opts[:missing] when :skip, :raise do_raise = true if missing == :raise fields.each do |f| if hash.has_key?(f) set_column_value("#{f}=", hash[f]) elsif f.is_a?(Symbol) && hash.has_key?(sf = f.to_s) set_column_value("#{sf}=", hash[sf]) elsif do_raise raise(Sequel::Error, "missing field in hash: #{f.inspect} not in #{hash.inspect}") end end else fields.each{|f| set_column_value("#{f}=", hash[f])} end self end
Set the shard that this object is tied to. Returns self.
# File lib/sequel/model/base.rb, line 1517 def set_server(s) @server = s @this = @this.server(s) if @this self end
Clear the setter_methods cache when a method is added
# File lib/sequel/model/base.rb, line 1524 def singleton_method_added(meth) @singleton_setter_added = true if meth.to_s.end_with?('=') super end
Returns (naked) dataset that should return only this instance.
Artist[1].this # SELECT * FROM artists WHERE (id = 1) LIMIT 1
# File lib/sequel/model/base.rb, line 1533 def this return @this if @this raise Error, "No dataset for model #{model}" unless ds = model.instance_dataset @this = use_server(ds.where(pk_hash)) end
Runs set with the passed hash and then runs save_changes.
artist.update(name: 'Jim') # UPDATE artists SET name = 'Jim' WHERE (id = 1)
# File lib/sequel/model/base.rb, line 1542 def update(hash) update_restricted(hash, :default) end
Update the instances values by calling set_fields
with the
arguments, then saves any changes to the record. Returns self.
artist.update_fields({name: 'Jim'}, [:name]) # UPDATE artists SET name = 'Jim' WHERE (id = 1) artist.update_fields({hometown: 'LA'}, [:name]) # UPDATE artists SET name = NULL WHERE (id = 1)
# File lib/sequel/model/base.rb, line 1554 def update_fields(hash, fields, opts=nil) set_fields(hash, fields, opts) save_changes end
Validates the object and returns true if no errors are reported.
artist.set(name: 'Valid').valid? # => true artist.set(name: 'Invalid').valid? # => false artist.errors.full_messages # => ['name cannot be Invalid']
# File lib/sequel/model/base.rb, line 1573 def valid?(opts = OPTS) begin _valid?(opts) rescue HookFailed false end end
Validates the object. If the object is invalid, errors should be added to
the errors attribute. By default, does nothing, as all models are valid by
default. See the “Model
Validations” guide. for details about validation. Should not be called
directly by user code, call valid?
instead to check if an
object is valid.
# File lib/sequel/model/base.rb, line 1565 def validate end