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 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.
Instance Attribute Summary collapse
-
#values ⇒ Object
(also: #to_hash, #_insert_values)
readonly
The hash of attribute values.
Instance Method Summary collapse
-
#==(obj) ⇒ Object
Alias of eql?.
-
#===(obj) ⇒ Object
(also: #pk_equal?)
Case equality.
-
#[](column) ⇒ Object
Returns value of the column's attribute.
-
#[]=(column, value) ⇒ Object
Sets the value for the given column.
-
#autoincrementing_primary_key ⇒ Object
The autoincrementing primary key for this model object.
-
#cancel_action(msg = nil) ⇒ Object
Cancel the current action.
-
#changed_columns ⇒ Object
The columns that have been updated.
-
#delete ⇒ Object
Deletes and returns
self
. -
#destroy(opts = OPTS) ⇒ Object
Like delete but runs hooks before and after delete.
-
#each(&block) ⇒ Object
Iterates through all of the current values using each.
-
#eql?(obj) ⇒ Boolean
Compares model instances by values.
-
#errors ⇒ Object
Returns the validation errors associated with this object.
-
#exists? ⇒ Boolean
Returns true when current instance exists, false otherwise.
-
#extend(mod) ⇒ Object
Ignore the model's setter method cache when this instances extends a module, as the module may contain setter methods.
-
#freeze ⇒ Object
Freeze the object in such a way that it is still usable but not modifiable.
-
#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).
-
#id ⇒ Object
Returns value for the :id attribute, even if the primary key is not id.
-
#initialize(values = OPTS) {|_self| ... } ⇒ Object
Creates new instance and passes the given values to set.
-
#inspect ⇒ Object
Returns a string representation of the model instance including the class name and values.
-
#keys ⇒ Object
Returns the keys in
values
. -
#lock!(style = :update) ⇒ Object
Refresh this record using
for_update
(by default, or the specified style when given) unless this is a new record. -
#marshallable! ⇒ Object
Remove elements of the model object that make marshalling fail.
-
#modified!(column = nil) ⇒ Object
Explicitly mark the object as modified, so
save_changes
/update
will run callbacks even if no columns have changed. -
#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? ⇒ Boolean
Returns true if the current instance represents a new record.
-
#pk ⇒ Object
Returns the primary key value identifying the model instance.
-
#pk_hash ⇒ Object
Returns a hash mapping the receivers primary key column(s) to their values.
-
#qualified_pk_hash(qualifier = model.table_name) ⇒ Object
Returns a hash mapping the receivers qualified primary key column(s) to their values.
-
#refresh ⇒ Object
Reloads attributes from database and returns self.
-
#reload ⇒ Object
Alias of refresh, but not aliased directly to make overriding in a plugin easier.
-
#save(opts = OPTS) ⇒ Object
Creates or updates the record, after making sure the record is valid and before hooks execute successfully.
-
#save_changes(opts = OPTS) ⇒ Object
Saves only changed columns if the object has been modified.
-
#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
). -
#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 thathash
entry for the field. -
#set_server(s) ⇒ Object
Set the shard that this object is tied to.
-
#singleton_method_added(meth) ⇒ Object
Clear the setter_methods cache when a method is added.
-
#skip_validation_on_next_save! ⇒ Object
Skip all validation of the object on the next call to #save, including the running of validation hooks.
-
#this ⇒ Object
Returns (naked) dataset that should return only this instance.
-
#update(hash) ⇒ Object
Runs #set with the passed hash and then runs save_changes.
-
#update_fields(hash, fields, opts = nil) ⇒ Object
Update the instance's values by calling set_fields with the arguments, then calls save_changes.
-
#valid?(opts = OPTS) ⇒ Boolean
Validates the object and returns true if no errors are reported.
-
#validate ⇒ Object
Validates the object.
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 1062 def values @values end |
Instance Method Details
#==(obj) ⇒ Object
Alias of eql?
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# File 'lib/sequel/model/base.rb', line 1127 def ==(obj) eql?(obj) end |
#===(obj) ⇒ Object Also known as: pk_equal?
Case equality. By default, checks equality of the primary key value, see pk_equal?.
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 1137 def ===(obj) case pkv = pk when nil return false when Array return false if pkv.any?(&:nil?) end (obj.class == model) && (obj.pk == pkv) 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 1102 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 1114 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 1169 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 1177 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 1188 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, ...}>
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# File 'lib/sequel/model/base.rb', line 1197 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, ...}>
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# File 'lib/sequel/model/base.rb', line 1209 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 1219 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 1228 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 1234 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 1248 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 1254 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 1262 def freeze unless errors.frozen? validate errors.freeze end values.freeze _changed_columns.freeze 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 1280 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 1295 def id @values[:id] end |
#initialize(values = OPTS) {|_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
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# File 'lib/sequel/model/base.rb', line 1090 def initialize(values = OPTS) @values = {} @new = true @modified = true initialize_set(values) _clear_changed_columns(:initialize) 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 1301 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 1310 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 1337 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 1347 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 1367 def modified!(column=nil) _add_changed_column(column) if column @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 1387 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 1399 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]
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# File 'lib/sequel/model/base.rb', line 1409 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 1423 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 1433 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'
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# File 'lib/sequel/model/base.rb', line 1445 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 1452 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 calls cancel_action, or
-
the record is new and before_create calls cancel_action, or
-
the record is not new and before_update calls cancel_action.
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
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# File 'lib/sequel/model/base.rb', line 1481 def save(opts=OPTS) raise Sequel::Error, "can't save frozen object" if frozen? set_server(opts[:server]) if opts[:server] unless _save_valid?(opts) raise(validation_failed_error) 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 1500 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 1511 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 1541 def set_fields(hash, fields, opts=nil) opts = if opts model..merge(opts) else model. 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_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 1567 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 1574 def singleton_method_added(meth) @singleton_setter_added = true if meth.to_s.end_with?('=') super end |
#skip_validation_on_next_save! ⇒ Object
Skip all validation of the object on the next call to #save, including the running of validation hooks. This is designed for and should only be used in cases where #valid? is called before saving and the validate: false
option cannot be passed to #save.
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# File 'lib/sequel/model/base.rb', line 1584 def skip_validation_on_next_save! @skip_validation_on_next_save = true end |
#this ⇒ Object
Returns (naked) dataset that should return only this instance.
Artist[1].this
# SELECT * FROM artists WHERE (id = 1) LIMIT 1
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# File 'lib/sequel/model/base.rb', line 1592 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 1601 def update(hash) update_restricted(hash, :default) end |
#update_fields(hash, fields, opts = nil) ⇒ Object
Update the instance's values by calling set_fields with the arguments, then calls save_changes.
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 1613 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. # => ['name cannot be Invalid']
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# File 'lib/sequel/model/base.rb', line 1632 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 1624 def validate end |