Module: Sequel::Model::ClassMethods

### Home Classes Methods

### In Files

- lib/sequel/model/base.rb
- lib/sequel/model/plugins.rb

### Methods

- #[]
- #columns
- #create
- #dataset
- #dataset=
- #db
- #db=
- #db_schema
- #def_dataset_method
- #find
- #find_or_create
- #implicit_table_name
- #inherited
- #load
- #no_primary_key
- #primary_key_hash
- #qualified_primary_key_hash
- #restrict_primary_key
- #restrict_primary_key?
- #set_allowed_columns
- #set_dataset
- #set_primary_key
- #set_restricted_columns
- #subset
- #table_name
- #unrestrict_primary_key

### Files

- CHANGELOG
- COPYING
- README.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- cheat_sheet.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- migration.rdoc
- model_hooks.rdoc
- opening_databases.rdoc
- prepared_statements.rdoc
- querying.rdoc
- reflection.rdoc
- 1.0.txt
- 1.1.txt
- 1.3.txt
- 1.4.0.txt
- 1.5.0.txt
- 2.0.0.txt
- 2.1.0.txt
- 2.10.0.txt
- 2.11.0.txt
- 2.12.0.txt
- 2.2.0.txt
- 2.3.0.txt
- 2.4.0.txt
- 2.5.0.txt
- 2.6.0.txt
- 2.7.0.txt
- 2.8.0.txt
- 2.9.0.txt
- 3.0.0.txt
- 3.1.0.txt
- 3.10.0.txt
- 3.11.0.txt
- 3.12.0.txt
- 3.2.0.txt
- 3.3.0.txt
- 3.4.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- sharding.rdoc
- sql.rdoc
- virtual_rows.rdoc

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No matching classes.

# Sequel::Model::ClassMethods

Class methods for Sequel::Model that implement basic model functionality.

- All of the method names in Model::DATASET_METHODS have class methods created that call the Model’s dataset with the method of the same name with the given arguments.

### Attributes

allowed_columns[R]

Which columns should be the only columns allowed in a call to set (default: not set, so all columns not otherwise restricted).

dataset_method_modules[R]

Array of modules that extend this model's dataset. Stored so that if the model's dataset is changed, it will be extended with all of these modules.

dataset_methods[R]

Hash of dataset methods with method name keys and proc values that are stored so when the dataset changes, methods defined with def_dataset_method will be applied to the new dataset.

plugins[R]

Array of plugins loaded by this class

primary_key[R]

The primary key for the class. Sequel can determine this automatically for many databases, but not all, so you may need to set it manually. If not determined automatically, the default is :id.

raise_on_save_failure[RW]

Whether to raise an error instead of returning nil on a failure to save/create/save_changes/etc due to a validation failure or a before_* hook returning false.

raise_on_typecast_failure[RW]

Whether to raise an error when unable to typecast data for a column (default: true). This should be set to false if you want to use validations to display nice error messages to the user (e.g. most web applications). You can use the validates_not_string validations (from either the validation_helpers or validation_class_methods standard plugins) in connection with option to check for typecast failures for columns that aren’t blobs or strings.

require_modification[RW]

Whether to raise an error if an UPDATE or DELETE query related to a model instance does not modify exactly 1 row. If set to false, Sequel will not check the number of rows modified (default: true).

restricted_columns[R]

Which columns are specifically restricted in a call to set/update/new/etc. (default: not set). Some columns are restricted regardless of this setting, such as the primary key column and columns in Model::RESTRICTED_SETTER_METHODS.

simple_pk[R]

Should be the literal primary key column name if this Model’s table has a simple primary key, or nil if the model has a compound primary key or no primary key.

simple_table[R]

Should be the literal table name if this Model’s dataset is a simple table (no select, order, join, etc.), or nil otherwise. This and simple_pk are used for an optimization in Model.[].

strict_param_setting[RW]

Whether new/set/update and their variants should raise an error if an invalid key is used. A key is invalid if no setter method exists for that key or the access to the setter method is restricted (e.g. due to it being a primary key field). If set to false, silently skip any key where the setter method doesn’t exist or access to it is restricted.

typecast_empty_string_to_nil[RW]

Whether to typecast the empty string (”) to nil for columns that are not string or blob. In most cases the empty string would be the way to specify a NULL SQL value in string form (nil.to_s == ”), and an empty string would not usually be typecast correctly for other types, so the default is true.

typecast_on_assignment[RW]

Whether to typecast attribute values on assignment (default: true). If set to false, no typecasting is done, so it will be left up to the database to typecast the value correctly.

use_transactions[RW]

Whether to use a transaction by default when saving/deleting records (default: true). If you are sending database queries in before_* or after_* hooks, you shouldn’t change the default setting without a good reason.

### Public Instance Methods

[](*args) click to toggle source

Returns the first record from the database matching the conditions. If a hash is given, it is used as the conditions. If another object is given, it finds the first record whose primary key(s) match the given argument(s).

    # File lib/sequel/model/base.rb, line 92
    def [](*args)
      args = args.first if (args.size == 1)
      args.is_a?(Hash) ? dataset[args] : primary_key_lookup(args)
    end

columns() click to toggle source

Returns the columns in the result set in their original order. Generally, this will use the columns determined via the database schema, but in certain cases (e.g. models that are based on a joined dataset) it will use Dataset#columns to find the columns, which may be empty if the Dataset has no records.

    # File lib/sequel/model/base.rb, line 102
    def columns
      @columns || set_columns(dataset.naked.columns)
    end

create(values = {}, &block) click to toggle source

Creates instance using new with the given values and block, and saves it.

    # File lib/sequel/model/base.rb, line 107
    def create(values = {}, &block)
      new(values, &block).save
    end

dataset() click to toggle source

Returns the dataset associated with the Model class. Raises an error if there is no associated dataset for this class.

    # File lib/sequel/model/base.rb, line 113
    def dataset
      @dataset || raise(Error, "No dataset associated with #{self}")
    end

dataset=(ds) click to toggle source

Alias of set_dataset

    # File lib/sequel/model/base.rb, line 118
    def dataset=(ds)
      set_dataset(ds)
    end

db() click to toggle source

Returns the database associated with the Model class. If this model doesn’t have a database associated with it, assumes the superclass’s database, or the first object in Sequel::DATABASES. If no Sequel::Database object has been created, raises an error.

    # File lib/sequel/model/base.rb, line 127
    def db
      return @db if @db
      @db = self == Model ? DATABASES.first : superclass.db
      raise(Error, "No database associated with #{self}") unless @db
      @db
    end

db=(db) click to toggle source

Sets the database associated with the Model class. If the model has an associated dataset, sets the model’s dataset to a dataset on the new database with the same options used by the current dataset.

    # File lib/sequel/model/base.rb, line 138
    def db=(db)
      @db = db
      set_dataset(db.dataset(@dataset.opts)) if @dataset
    end

db_schema() click to toggle source

Returns the cached schema information if available or gets it from the database.

    # File lib/sequel/model/base.rb, line 145
    def db_schema
      @db_schema ||= get_db_schema
    end

def_dataset_method(*args, &block) click to toggle source

If a block is given, define a method on the dataset (if the model has an associated dataset) with the given argument name using the given block as well as a method on the model that calls the dataset method. Stores the method name and block so that it can be reapplied if the model’s dataset changes.

If a block is not given, define a method on the model for each argument that calls the dataset method of the same argument name.

    # File lib/sequel/model/base.rb, line 156
    def def_dataset_method(*args, &block)
      raise(Error, "No arguments given") if args.empty?
      if block_given?
        raise(Error, "Defining a dataset method using a block requires only one argument") if args.length > 1
        meth = args.first
        @dataset_methods[meth] = block
        dataset.meta_def(meth, &block) if @dataset
      end
      args.each{|arg| instance_eval("def #{arg}(*args, &block); dataset.#{arg}(*args, &block) end", __FILE__, __LINE__) unless respond_to?(arg)}
    end

find(*args, &block) click to toggle source

Finds a single record according to the supplied filter, e.g.:

    Ticket.find :author => 'Sharon' # => record

You are encouraged to use Model.[] or Model.first instead of this method.

    # File lib/sequel/model/base.rb, line 172
    def find(*args, &block)
      filter(*args, &block).first
    end

find_or_create(cond) click to toggle source

Like find but invokes create with given conditions when record does not exist.

    # File lib/sequel/model/base.rb, line 178
    def find_or_create(cond)
      find(cond) || create(cond)
    end

implicit_table_name() click to toggle source

Returns the implicit table name for the model class.

    # File lib/sequel/model/base.rb, line 210
    def implicit_table_name
      pluralize(underscore(demodulize(name))).to_sym
    end

inherited(subclass) click to toggle source

If possible, set the dataset for the model subclass as soon as it is created. Also, make sure the inherited class instance variables are copied into the subclass.

    # File lib/sequel/model/base.rb, line 185
    def inherited(subclass)
      super
      ivs = subclass.instance_variables.collect{|x| x.to_s}
      EMPTY_INSTANCE_VARIABLES.each{|iv| subclass.instance_variable_set(iv, nil) unless ivs.include?(iv.to_s)}
      INHERITED_INSTANCE_VARIABLES.each do |iv, dup|
        next if ivs.include?(iv.to_s)
        sup_class_value = instance_variable_get(iv)
        sup_class_value = sup_class_value.dup if dup == :dup && sup_class_value
        subclass.instance_variable_set(iv, sup_class_value)
      end
      unless ivs.include?("@dataset")
        db
        begin
          if self == Model || !@dataset
            subclass.set_dataset(subclass.implicit_table_name) unless subclass.name.empty?
          elsif @dataset
            subclass.set_dataset(@dataset.clone, :inherited=>true)
          end
        rescue
          nil
        end
      end
    end

load(values) click to toggle source

Initializes a model instance as an existing record. This constructor is used by Sequel to initialize model instances when fetching records. load requires that values be a hash where all keys are symbols. It probably should not be used by external code.

    # File lib/sequel/model/base.rb, line 218
    def load(values)
      new(values, true)
    end

no_primary_key() click to toggle source

Mark the model as not having a primary key. Not having a primary key can cause issues, among which is that you won’t be able to update records.

    # File lib/sequel/model/base.rb, line 224
    def no_primary_key
      @simple_pk = @primary_key = nil
    end

primary_key_hash(value) click to toggle source

Returns primary key attribute hash. If using a composite primary key value such be an array with values for each primary key in the correct order. For a standard primary key, value should be an object with a compatible type for the key. If the model does not have a primary key, raises an Error.

    # File lib/sequel/model/base.rb, line 233
    def primary_key_hash(value)
      raise(Error, "#{self} does not have a primary key") unless key = @primary_key
      case key
      when Array
        hash = {}
        key.each_with_index{|k,i| hash[k] = value[i]}
        hash
      else
        {key => value}
      end
    end

qualified_primary_key_hash(value, qualifier=table_name) click to toggle source

Return a hash where the keys are qualified column references. Uses the given qualifier if provided, or the table_name otherwise.

    # File lib/sequel/model/base.rb, line 247
    def qualified_primary_key_hash(value, qualifier=table_name)
      h = primary_key_hash(value)
      h.to_a.each{|k,v| h[SQL::QualifiedIdentifier.new(qualifier, k)] = h.delete(k)}
      h
    end

restrict_primary_key() click to toggle source

Restrict the setting of the primary key(s) inside new/set/update. Because this is the default, this only make sense to use in a subclass where the parent class has used unrestrict_primary_key.

    # File lib/sequel/model/base.rb, line 256
    def restrict_primary_key
      @restrict_primary_key = true
    end

restrict_primary_key?() click to toggle source

Whether or not setting the primary key inside new/set/update is restricted, true by default.

    # File lib/sequel/model/base.rb, line 262
    def restrict_primary_key?
      @restrict_primary_key
    end

set_allowed_columns(*cols) click to toggle source

Set the columns to allow in new/set/update. Using this means that any columns not listed here will not be modified. If you have any virtual setter methods (methods that end in =) that you want to be used in new/set/update, they need to be listed here as well (without the =).

It may be better to use (set|update)_only instead of this in places where only certain columns may be allowed.

    # File lib/sequel/model/base.rb, line 273
    def set_allowed_columns(*cols)
      @allowed_columns = cols
    end

set_dataset(ds, opts={}) click to toggle source

Sets the dataset associated with the Model class. ds can be a Symbol (specifying a table name in the current database), or a Dataset. If a dataset is used, the model’s database is changed to the given dataset. If a symbol is used, a dataset is created from the current database with the table name given. Other arguments raise an Error. Returns self.

This changes the row_proc of the given dataset to return model objects, extends the dataset with the dataset_method_modules, and defines methods on the dataset using the dataset_methods. It also attempts to determine the database schema for the model, based on the given dataset.

    # File lib/sequel/model/base.rb, line 289
    def set_dataset(ds, opts={})
      inherited = opts[:inherited]
      @dataset = case ds
      when Symbol
        @simple_table = db.literal(ds)
        db[ds]
      when Dataset
        @simple_table = nil
        @db = ds.db
        ds
      else
        raise(Error, "Model.set_dataset takes a Symbol or a Sequel::Dataset")
      end
      @dataset.row_proc = Proc.new{|r| load(r)}
      @require_modification = Sequel::Model.require_modification.nil? ? @dataset.provides_accurate_rows_matched? : Sequel::Model.require_modification
      if inherited
        @simple_table = superclass.simple_table
        @columns = @dataset.columns rescue nil
      else
        @dataset_method_modules.each{|m| @dataset.extend(m)} if @dataset_method_modules
        @dataset_methods.each{|meth, block| @dataset.meta_def(meth, &block)} if @dataset_methods
      end
      @dataset.model = self if @dataset.respond_to?(:model=)
      check_non_connection_error{@db_schema = (inherited ? superclass.db_schema : get_db_schema)}
      self
    end

set_primary_key(*key) click to toggle source

Sets the primary key for this model. You can use either a regular or a composite primary key.

Example:

    class Tagging < Sequel::Model
      # composite key
      set_primary_key [:taggable_id, :tag_id]
    end

    class Person < Sequel::Model
      # regular key
      set_primary_key :person_id
    end

You can set it to nil to not have a primary key, but that cause certain things not to work, see no_primary_key.

    # File lib/sequel/model/base.rb, line 332
    def set_primary_key(*key)
      key = key.flatten
      @simple_pk = key.length == 1 ? db.literal(key.first) : nil
      @primary_key = (key.length == 1) ? key[0] : key
    end

set_restricted_columns(*cols) click to toggle source

Set the columns to restrict in new/set/update. Using this means that attempts to call setter methods for the columns listed here will cause an exception or be silently skipped (based on the strict_param_setting setting. If you have any virtual # setter methods (methods that end in =) that you want not to be used in new/set/update, they need to be listed here as well (without the =).

It may be better to use (set|update)_except instead of this in places where only certain columns may be allowed.

    # File lib/sequel/model/base.rb, line 346
    def set_restricted_columns(*cols)
      @restricted_columns = cols
    end

subset(name, *args, &block) click to toggle source

Defines a method that returns a filtered dataset. Subsets create dataset methods, so they can be chained for scoping. For example:

    Topic.subset(:joes, :username.like('%joe%'))
    Topic.subset(:popular){|o| o.num_posts > 100}
    Topic.subset(:recent){|o| o.created_on > Date.today - 7}

Allows you to do:

    Topic.joes.recent.popular

to get topics with a username that includes joe that have more than 100 posts and were created less than 7 days ago.

Both the args given and the block are passed to Dataset#filter.

    # File lib/sequel/model/base.rb, line 367
    def subset(name, *args, &block)
      def_dataset_method(name){filter(*args, &block)}
    end

table_name() click to toggle source

Returns name of primary table for the dataset.

    # File lib/sequel/model/base.rb, line 372
    def table_name
      dataset.first_source_alias
    end

unrestrict_primary_key() click to toggle source

Allow the setting of the primary key(s) inside new/set/update.

    # File lib/sequel/model/base.rb, line 377
    def unrestrict_primary_key
      @restrict_primary_key = false
    end

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