Module: Sequel::Model::InstanceMethods

Defined in:
lib/sequel/model/base.rb

Overview

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 call before_destroy, do the destroy, and then call after_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.

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#values ⇒ Object (readonly) Also known as: to_hash, _insert_values

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', ...}


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# File 'lib/sequel/model/base.rb', line 1030

def values
  @values
end

Instance Method Details

#==(obj) ⇒ Object

Alias of eql?


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# File 'lib/sequel/model/base.rb', line 1095

def ==(obj)
  eql?(obj)
end

#===(obj) ⇒ Object

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


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# File 'lib/sequel/model/base.rb', line 1105

def ===(obj)
  pk.nil? ? false : (obj.class == model) && (obj.pk == pk)
end

#[](column) ⇒ Object

Returns value of the column's attribute.

Artist[1][:id] #=> 1


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# File 'lib/sequel/model/base.rb', line 1070

def [](column)
  @values[column]
end

#[]=(column, value) ⇒ Object

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'}


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# File 'lib/sequel/model/base.rb', line 1082

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

#autoincrementing_primary_key ⇒ Object

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.


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# File 'lib/sequel/model/base.rb', line 1120

def autoincrementing_primary_key
  primary_key
end

#cancel_action(msg = nil) ⇒ Object

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.


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# File 'lib/sequel/model/base.rb', line 1128

def cancel_action(msg=nil)
  raise_hook_failure(msg)
end

#changed_columns ⇒ Object

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]


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# File 'lib/sequel/model/base.rb', line 1139

def changed_columns
  @changed_columns ||= []
end

#delete ⇒ Object

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, ...}>

Raises:


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# File 'lib/sequel/model/base.rb', line 1148

def delete
  raise Sequel::Error, "can't delete frozen object" if frozen?
  _delete
  self
end

#destroy(opts = OPTS) ⇒ Object

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, ...}>

Raises:


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# File 'lib/sequel/model/base.rb', line 1160

def destroy(opts = OPTS)
  raise Sequel::Error, "can't destroy frozen object" if frozen?
  checked_save_failure(opts){checked_transaction(opts){_destroy(opts)}}
end

#each(&block) ⇒ Object

Iterates through all of the current values using each.

Album[1].each{|k, v| puts "#{k} => #{v}"}
# id => 1
# name => 'Bob'


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# File 'lib/sequel/model/base.rb', line 1170

def each(&block)
  @values.each(&block)
end

#eql?(obj) ⇒ Boolean

Compares model instances by values.

Artist[1] == Artist[1] # => true
Artist.new == Artist.new # => true
Artist[1].set(:name=>'Bob') == Artist[1] # => false


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# File 'lib/sequel/model/base.rb', line 1179

def eql?(obj)
  (obj.class == model) && (obj.values == @values)
end

#errors ⇒ Object

Returns the validation errors associated with this object. See Errors.


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# File 'lib/sequel/model/base.rb', line 1185

def errors
  @errors ||= errors_class.new
end

#exists? ⇒ Boolean

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


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# File 'lib/sequel/model/base.rb', line 1199

def exists?
  new? ? false : !this.get(SQL::AliasedExpression.new(1, :one)).nil?
end

#extend(mod) ⇒ Object

Ignore the model's setter method cache when this instances extends a module, as the module may contain setter methods.


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# File 'lib/sequel/model/base.rb', line 1205

def extend(mod)
  @singleton_setter_added = true
  super
end

#freeze ⇒ Object

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.


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# File 'lib/sequel/model/base.rb', line 1213

def freeze
  values.freeze
  changed_columns.freeze
  unless errors.frozen?
    validate
    errors.freeze
  end
  this if !new? && model.primary_key
  super
end

#hash ⇒ Object

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


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# File 'lib/sequel/model/base.rb', line 1231

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

#id ⇒ Object

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


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# File 'lib/sequel/model/base.rb', line 1246

def id
  @values[:id]
end

#initialize(values = {}) {|_self| ... } ⇒ Object

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

Yields:

  • (_self)

Yield Parameters:


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# File 'lib/sequel/model/base.rb', line 1058

def initialize(values = {})
  @values = {}
  @new = true
  @modified = true
  initialize_set(values)
  changed_columns.clear 
  yield self if block_given?
end

#inspect ⇒ Object

Returns a string representation of the model instance including the class name and values.


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# File 'lib/sequel/model/base.rb', line 1252

def inspect
  "#<#{model.name} @values=#{inspect_values}>"
end

#keys ⇒ Object

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]


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# File 'lib/sequel/model/base.rb', line 1261

def keys
  @values.keys
end

#lock!(style = :update) ⇒ Object

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


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# File 'lib/sequel/model/base.rb', line 1288

def lock!(style=:update)
  _refresh(this.lock_style(style)) unless new?
  self
end

#marshallable! ⇒ Object

Remove elements of the model object that make marshalling fail. Returns self.

a = Artist[1]
a.marshallable!
Marshal.dump(a)


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# File 'lib/sequel/model/base.rb', line 1298

def marshallable!
  @this = nil
  self
end

#modified!(column = nil) ⇒ Object

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')


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# File 'lib/sequel/model/base.rb', line 1318

def modified!(column=nil)
  if column && !changed_columns.include?(column)
    changed_columns << column
  end
  @modified = true
end

#modified?(column = nil) ⇒ Boolean

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


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# File 'lib/sequel/model/base.rb', line 1340

def modified?(column=nil)
  if column
    changed_columns.include?(column)
  else
    @modified || !changed_columns.empty?
  end
end

#new? ⇒ Boolean

Returns true if the current instance represents a new record.

Artist.new.new? # => true
Artist[1].new? # => false


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# File 'lib/sequel/model/base.rb', line 1352

def new?
  defined?(@new) ? @new : (@new = false)
end

#pk ⇒ Object

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]

Raises:


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# File 'lib/sequel/model/base.rb', line 1362

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

#pk_hash ⇒ Object

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}


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# File 'lib/sequel/model/base.rb', line 1376

def pk_hash
  model.primary_key_hash(pk)
end

#qualified_pk_hash(qualifier = model.table_name) ⇒ Object

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}


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# File 'lib/sequel/model/base.rb', line 1386

def qualified_pk_hash(qualifier=model.table_name)
  model.qualified_primary_key_hash(pk, qualifier)
end

#refresh ⇒ Object

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'

Raises:


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# File 'lib/sequel/model/base.rb', line 1398

def refresh
  raise Sequel::Error, "can't refresh frozen object" if frozen?
  _refresh(this)
  self
end

#reload ⇒ Object

Alias of refresh, but not aliased directly to make overriding in a plugin easier.


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# File 'lib/sequel/model/base.rb', line 1405

def reload
  refresh
end

#save(opts = OPTS) ⇒ Object

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 raise_on_save_failure setting

: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 use_transactions setting

:validate

set to false to skip validation

Raises:


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# File 'lib/sequel/model/base.rb', line 1434

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

#save_changes(opts = OPTS) ⇒ Object

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', ...}


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# File 'lib/sequel/model/base.rb', line 1453

def save_changes(opts=OPTS)
  save(Hash[opts].merge!(:changed=>true)) || false if modified? 
end

#set(hash) ⇒ Object

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'


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# File 'lib/sequel/model/base.rb', line 1464

def set(hash)
  set_restricted(hash, :default)
end

#set_fields(hash, fields, opts = nil) ⇒ Object

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


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# File 'lib/sequel/model/base.rb', line 1494

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 opts[:missing]
  when :skip
    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])
      end
    end
  when :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])
      else
        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_server(s) ⇒ Object

Set the shard that this object is tied to. Returns self.


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# File 'lib/sequel/model/base.rb', line 1527

def set_server(s)
  @server = s
  @this = @this.server(s) if @this
  self
end

#singleton_method_added(meth) ⇒ Object

Clear the setter_methods cache when a method is added


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# File 'lib/sequel/model/base.rb', line 1534

def singleton_method_added(meth)
  @singleton_setter_added = true if meth.to_s.end_with?('=')
  super
end

#this ⇒ Object

Returns (naked) dataset that should return only this instance.

Artist[1].this
# SELECT * FROM artists WHERE (id = 1) LIMIT 1

Raises:


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# File 'lib/sequel/model/base.rb', line 1543

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

#update(hash) ⇒ Object

Runs #set with the passed hash and then runs save_changes.

artist.update(name: 'Jim') # UPDATE artists SET name = 'Jim' WHERE (id = 1)


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# File 'lib/sequel/model/base.rb', line 1552

def update(hash)
  update_restricted(hash, :default)
end

#update_fields(hash, fields, opts = nil) ⇒ Object

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)


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# File 'lib/sequel/model/base.rb', line 1564

def update_fields(hash, fields, opts=nil)
  set_fields(hash, fields, opts)
  save_changes
end

#valid?(opts = OPTS) ⇒ Boolean

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']


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# File 'lib/sequel/model/base.rb', line 1583

def valid?(opts = OPTS)
  begin
    _valid?(opts)
  rescue HookFailed
    false
  end
end

#validate ⇒ Object

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.


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# File 'lib/sequel/model/base.rb', line 1575

def validate
end