Module: Sequel::Model::InstanceMethods
- Defined in:
- lib/sequel/model/base.rb
Overview
Sequel::Model instance methods that implement basic model functionality.
-
All of the methods in
HOOKS
andAROUND_HOOKS
create instance methods that are called by Sequel when the appropriate action occurs. For example, when destroying a model object, Sequel will callaround_destory
, 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.
-
All of the methods in
BOOLEAN_SETTINGS
create attr_writers allowing you to set values for the attribute. It also creates instance getters returning the value of the setting. If the value has not yet been set, it gets the default value from the class by calling the class method of the same name.
Instance Attribute Summary collapse
-
#values ⇒ Object
readonly
The hash of attribute values.
Instance Method Summary collapse
-
#==(obj) ⇒ Object
Alias of eql?.
-
#===(obj) ⇒ Object
If pk is not nil, true only if the objects have the same class and pk.
-
#[](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.
-
#changed_columns ⇒ Object
The columns that have been updated.
-
#delete ⇒ Object
Deletes and returns
self
. -
#destroy(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.
-
#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 = {}, from_db = false) ⇒ 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! ⇒ Object
Refresh this record using
for_update
unless this is a new record. -
#marshallable! ⇒ Object
Remove elements of the model object that make marshalling fail.
-
#modified! ⇒ Object
Explicitly mark the object as modified, so
save_changes
/update
will run callbacks even if no columns have changed. -
#modified? ⇒ 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 identifying mapping the receivers 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(*columns) ⇒ Object
Creates or updates the record, after making sure the record is valid and before hooks execute successfully.
-
#save_changes(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_all(hash) ⇒ Object
Set all values using the entries in the hash, ignoring any setting of allowed_columns or restricted columns in the model.
-
#set_except(hash, *except) ⇒ Object
Set all values using the entries in the hash, except for the keys given in except.
-
#set_fields(hash, fields) ⇒ 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_only(hash, *only) ⇒ Object
Set the values using the entries in the hash, only if the key is included in only.
-
#set_values(hash) ⇒ Object
Replace the current values with hash.
-
#singleton_method_added(meth) ⇒ Object
Clear the setter_methods cache when a method is added.
-
#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_all(hash) ⇒ Object
Update all values using the entries in the hash, ignoring any setting of
allowed_columns
orrestricted_columns
in the model. -
#update_except(hash, *except) ⇒ Object
Update all values using the entries in the hash, except for the keys given in except.
-
#update_fields(hash, fields) ⇒ Object
Update the instances values by calling
set_fields
with thehash
andfields
, then save any changes to the record. -
#update_only(hash, *only) ⇒ Object
Update the values using the entries in the hash, only if the key is included in only.
-
#valid?(opts = {}) ⇒ Boolean
Validates the object and returns true if no errors are reported.
-
#validate ⇒ Object
Validates the object.
Instance Attribute Details
#values ⇒ Object (readonly)
The hash of attribute values. Keys are symbols with the names of the underlying database columns.
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 824 def values @values end |
Instance Method Details
#==(obj) ⇒ Object
Alias of eql?
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# File 'lib/sequel/model/base.rb', line 883 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 893 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 858 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 870 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) if new? || !@values.include?(column) || v != (c = @values[column]) || v.class != c.class changed_columns << column unless changed_columns.include?(column) @values[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 908 def autoincrementing_primary_key primary_key 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 919 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 928 def delete _delete self end |
#destroy(opts = {}) ⇒ Object
Like delete but runs hooks before and after delete. If before_destroy returns false, returns false without deleting the object the the database. Otherwise, deletes the item from the database and returns self. 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 942 def destroy(opts = {}) 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 951 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 960 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 966 def errors @errors ||= Errors.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 980 def exists? new? ? false : !this.get(1).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 986 def extend(mod) @singleton_setter_added = true 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 998 def hash case primary_key when Array [model, !pk.all? ? @values.sort_by{|k,v| k.to_s} : pk].hash when Symbol [model, pk.nil? ? @values.sort_by{|k,v| k.to_s} : pk].hash else [model, @values.sort_by{|k,v| k.to_s}].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 1013 def id @values[:id] end |
#initialize(values = {}, from_db = false) ⇒ Object
Creates new instance and passes the given values to set. If a block is given, yield the instance to the block unless from_db is true. This method runs the after_initialize hook after it has optionally yielded itself to the block.
Arguments:
- values
-
should be a hash to pass to set.
- from_db
-
only for backwards compatibility, forget it exists.
Artist.new(:name=>'Bob')
Artist.new do |a|
a.name = 'Bob'
end
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# File 'lib/sequel/model/base.rb', line 841 def initialize(values = {}, from_db = false) if from_db set_values(values) else @values = {} @new = true @modified = true initialize_set(values) changed_columns.clear yield self if block_given? end after_initialize 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 1019 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 1028 def keys @values.keys end |
#lock! ⇒ Object
Refresh this record using for_update
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.
a = Artist[1]
Artist.db.transaction do
a.lock!
a.update(...)
end
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# File 'lib/sequel/model/base.rb', line 1041 def lock! new? ? self : _refresh(this.for_update) 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 1050 def marshallable! @this = nil self end |
#modified! ⇒ 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
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# File 'lib/sequel/model/base.rb', line 1062 def modified! @modified = true end |
#modified? ⇒ 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
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# File 'lib/sequel/model/base.rb', line 1074 def modified? @modified || !changed_columns.empty? 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 1082 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 1092 def pk raise(Error, "No primary key is associated with this model") unless key = primary_key key.is_a?(Array) ? key.map{|k| @values[k]} : @values[key] end |
#pk_hash ⇒ Object
Returns a hash identifying 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 1101 def pk_hash model.primary_key_hash(pk) 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 1113 def refresh _refresh(this) 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 1118 def reload refresh end |
#save(*columns) ⇒ 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.
You can provide an optional list of columns to update, in which case it only updates those columns, or a options hash.
Takes the following options:
- :changed
-
save all changed columns, instead of all columns or the columns given
- :transaction
-
set to true or false to override the current
use_transactions
setting - :validate
-
set to false to skip validation
- :raise_on_failure
-
set to true or false to override the current
raise_on_save_failure
setting
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# File 'lib/sequel/model/base.rb', line 1147 def save(*columns) opts = columns.last.is_a?(Hash) ? columns.pop : {} if opts[:validate] != false unless checked_save_failure(opts){_valid?(true, opts)} raise(ValidationFailed.new(errors)) if raise_on_failure?(opts) return end end checked_save_failure(opts){checked_transaction(opts){_save(columns, opts)}} end |
#save_changes(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 1167 def save_changes(opts={}) save(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 1178 def set(hash) set_restricted(hash, nil, nil) end |
#set_all(hash) ⇒ Object
Set all values using the entries in the hash, ignoring any setting of allowed_columns or restricted columns in the model.
Artist.set_restricted_columns(:name)
artist.set_all(:name=>'Jim')
artist.name # => 'Jim'
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# File 'lib/sequel/model/base.rb', line 1188 def set_all(hash) set_restricted(hash, false, false) end |
#set_except(hash, *except) ⇒ Object
Set all values using the entries in the hash, except for the keys given in except. You should probably use set_fields
or set_only
instead of this method, as blacklist approaches to security are a bad idea.
artist.set_except({:name=>'Jim'}, :hometown)
artist.name # => 'Jim'
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# File 'lib/sequel/model/base.rb', line 1198 def set_except(hash, *except) set_restricted(hash, false, except.flatten) end |
#set_fields(hash, fields) ⇒ 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.
artist.set_fields({:name=>'Jim'}, [:name])
artist.name # => 'Jim'
artist.set_fields({:hometown=>'LA'}, [:name])
artist.name # => nil
artist.hometown # => 'Sac'
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# File 'lib/sequel/model/base.rb', line 1211 def set_fields(hash, fields) fields.each{|f| send("#{f}=", hash[f])} self end |
#set_only(hash, *only) ⇒ Object
Set the values using the entries in the hash, only if the key is included in only. It may be a better idea to use set_fields
instead of this method.
artist.set_only({:name=>'Jim'}, :name)
artist.name # => 'Jim'
artist.set_only({:hometown=>'LA'}, :name) # Raise Error
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# File 'lib/sequel/model/base.rb', line 1224 def set_only(hash, *only) set_restricted(hash, only.flatten, false) end |
#set_values(hash) ⇒ Object
Replace the current values with hash. Should definitely not be used with untrusted input, and should probably not be called directly by user code.
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# File 'lib/sequel/model/base.rb', line 1231 def set_values(hash) @values = hash 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 1236 def singleton_method_added(meth) @singleton_setter_added = true if meth.to_s =~ SETTER_METHOD_REGEXP super 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 1245 def this @this ||= model.dataset.filter(pk_hash).limit(1).naked 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 1252 def update(hash) update_restricted(hash, nil, nil) end |
#update_all(hash) ⇒ Object
Update all values using the entries in the hash, ignoring any setting of allowed_columns
or restricted_columns
in the model.
Artist.set_restricted_columns(:name)
artist.update_all(:name=>'Jim') # UPDATE artists SET name = 'Jim' WHERE (id = 1)
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# File 'lib/sequel/model/base.rb', line 1261 def update_all(hash) update_restricted(hash, false, false) end |
#update_except(hash, *except) ⇒ Object
Update all values using the entries in the hash, except for the keys given in except. You should probably use update_fields
or update_only
instead of this method, as blacklist approaches to security are a bad idea.
artist.update_except({:name=>'Jim'}, :hometown) # UPDATE artists SET name = 'Jim' WHERE (id = 1)
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# File 'lib/sequel/model/base.rb', line 1270 def update_except(hash, *except) update_restricted(hash, false, except.flatten) end |
#update_fields(hash, fields) ⇒ Object
Update the instances values by calling set_fields
with the hash
and fields
, then save 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 1282 def update_fields(hash, fields) set_fields(hash, fields) save_changes end |
#update_only(hash, *only) ⇒ Object
Update the values using the entries in the hash, only if the key is included in only. It may be a better idea to use update_fields
instead of this method.
artist.update_only({:name=>'Jim'}, :name)
# UPDATE artists SET name = 'Jim' WHERE (id = 1)
artist.update_only({:hometown=>'LA'}, :name) # Raise Error
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# File 'lib/sequel/model/base.rb', line 1295 def update_only(hash, *only) update_restricted(hash, only.flatten, false) end |
#valid?(opts = {}) ⇒ Boolean
Validates the object and returns true if no errors are reported.
artist(:name=>'Valid').valid? # => true
artist(:name=>'Invalid').valid? # => false
artist.errors. # => ['name cannot be Invalid']
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# File 'lib/sequel/model/base.rb', line 1313 def valid?(opts = {}) _valid?(false, opts) 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 1305 def validate end |