Module: Sequel::Plugins::ValidationHelpers::InstanceMethods

Defined in:
lib/sequel/plugins/validation_helpers.rb

Instance Method Summary collapse

Instance Method Details

#validates_exact_length(exact, atts, opts = OPTS) ⇒ Object

Check that the attribute values are the given exact length.


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# File 'lib/sequel/plugins/validation_helpers.rb', line 101

def validates_exact_length(exact, atts, opts=OPTS)
  validatable_attributes_for_type(:exact_length, atts, opts){|a,v,m| validation_error_message(m, exact) if v.nil? || v.length != exact}
end

#validates_format(with, atts, opts = OPTS) ⇒ Object

Check the string representation of the attribute value(s) against the regular expression with.


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# File 'lib/sequel/plugins/validation_helpers.rb', line 106

def validates_format(with, atts, opts=OPTS)
  validatable_attributes_for_type(:format, atts, opts){|a,v,m| validation_error_message(m, with) unless v.to_s =~ with}
end

#validates_includes(set, atts, opts = OPTS) ⇒ Object

Check attribute value(s) is included in the given set.


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# File 'lib/sequel/plugins/validation_helpers.rb', line 111

def validates_includes(set, atts, opts=OPTS)
  validatable_attributes_for_type(:includes, atts, opts){|a,v,m| validation_error_message(m, set) unless set.public_send(set.respond_to?(:cover?) ? :cover? : :include?, v)}
end

#validates_integer(atts, opts = OPTS) ⇒ Object

Check attribute value(s) string representation is a valid integer.


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# File 'lib/sequel/plugins/validation_helpers.rb', line 116

def validates_integer(atts, opts=OPTS)
  validatable_attributes_for_type(:integer, atts, opts) do |a,v,m|
    begin
      Kernel.Integer(v.to_s)
      nil
    rescue
      validation_error_message(m)
    end
  end
end

#validates_length_range(range, atts, opts = OPTS) ⇒ Object

Check that the attribute values length is in the specified range.


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# File 'lib/sequel/plugins/validation_helpers.rb', line 128

def validates_length_range(range, atts, opts=OPTS)
  validatable_attributes_for_type(:length_range, atts, opts){|a,v,m| validation_error_message(m, range) if v.nil? || !range.cover?(v.length)}
end

#validates_max_length(max, atts, opts = OPTS) ⇒ Object

Check that the attribute values are not longer than the given max length.

Accepts a :nil_message option that is the error message to use when the value is nil instead of being too long.


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# File 'lib/sequel/plugins/validation_helpers.rb', line 136

def validates_max_length(max, atts, opts=OPTS)
  validatable_attributes_for_type(:max_length, atts, opts) do |a,v,m|
    if v.nil?
      validation_error_message(opts[:nil_message] || default_validation_helpers_options(:max_length)[:nil_message])
    elsif v.length > max
      validation_error_message(m, max)
    end
  end
end

#validates_min_length(min, atts, opts = OPTS) ⇒ Object

Check that the attribute values are not shorter than the given min length.


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# File 'lib/sequel/plugins/validation_helpers.rb', line 147

def validates_min_length(min, atts, opts=OPTS)
  validatable_attributes_for_type(:min_length, atts, opts){|a,v,m| validation_error_message(m, min) if v.nil? || v.length < min}
end

#validates_not_null(atts, opts = OPTS) ⇒ Object

Check attribute value(s) are not NULL/nil.


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# File 'lib/sequel/plugins/validation_helpers.rb', line 152

def validates_not_null(atts, opts=OPTS)
  validatable_attributes_for_type(:not_null, atts, opts){|a,v,m| validation_error_message(m) if v.nil?}
end

#validates_numeric(atts, opts = OPTS) ⇒ Object

Check attribute value(s) string representation is a valid float.


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# File 'lib/sequel/plugins/validation_helpers.rb', line 157

def validates_numeric(atts, opts=OPTS)
  validatable_attributes_for_type(:numeric, atts, opts) do |a,v,m|
    begin
      Kernel.Float(v.to_s)
      nil
    rescue
      validation_error_message(m)
    end
  end
end

#validates_operator(operator, rhs, atts, opts = OPTS) ⇒ Object

Check attribute value(s) against a specified value and operation, e.g. validates_operator(:>, 3, :value) validates that value > 3.


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# File 'lib/sequel/plugins/validation_helpers.rb', line 170

def validates_operator(operator, rhs, atts, opts=OPTS)
  validatable_attributes_for_type(:operator, atts, opts){|a,v,m| validation_error_message(m, operator, rhs) if v.nil? || !v.public_send(operator, rhs)}
end

#validates_presence(atts, opts = OPTS) ⇒ Object

Check attribute value(s) is not considered blank by the database, but allow false values.


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# File 'lib/sequel/plugins/validation_helpers.rb', line 197

def validates_presence(atts, opts=OPTS)
  validatable_attributes_for_type(:presence, atts, opts){|a,v,m| validation_error_message(m) if model.db.send(:blank_object?, v) && v != false}
end

#validates_schema_types(atts = keys, opts = OPTS) ⇒ Object

Validates for all of the model columns (or just the given columns) that the column value is an instance of the expected class based on the column's schema type.


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# File 'lib/sequel/plugins/validation_helpers.rb', line 177

def validates_schema_types(atts=keys, opts=OPTS)
  Array(atts).each do |k|
    if type = schema_type_class(k)
      validates_type(type, k, {:allow_nil=>true}.merge!(opts))
    end
  end
end

#validates_type(klass, atts, opts = OPTS) ⇒ Object

Check if value is an instance of a class. If klass is an array, the value must be an instance of one of the classes in the array.


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# File 'lib/sequel/plugins/validation_helpers.rb', line 187

def validates_type(klass, atts, opts=OPTS)
  klass = klass.to_s.constantize if klass.is_a?(String) || klass.is_a?(Symbol)
  validatable_attributes_for_type(:type, atts, opts) do |a,v,m|
    if klass.is_a?(Array) ? !klass.any?{|kls| v.is_a?(kls)} : !v.is_a?(klass)
      validation_error_message(m, klass)
    end
  end
end

#validates_unique(*atts) ⇒ Object

Checks that there are no duplicate values in the database for the given attributes. Pass an array of fields instead of multiple fields to specify that the combination of fields must be unique, instead of that each field should have a unique value.

This means that the code:

validates_unique([:column1, :column2])

validates the grouping of column1 and column2 while

validates_unique(:column1, :column2)

validates them separately.

You can pass a block, which is yielded the dataset in which the columns must be unique. So if you are doing a soft delete of records, in which the name must be unique, but only for active records:

validates_unique(:name){|ds| ds.where(:active)}

You should also add a unique index in the database, as this suffers from a fairly obvious race condition.

This validation does not respect the :allow_* options that the other validations accept, since it can deal with a grouping of multiple attributes.

Possible Options:

:dataset

The base dataset to use for the unique query, defaults to the model's dataset.

:message

The message to use (default: 'is already taken')

:only_if_modified

Only check the uniqueness if the object is new or one of the columns has been modified, true by default.

:where

A callable object where call takes three arguments, a dataset, the current object, and an array of columns, and should return a modified dataset that is filtered to include only rows with the same values as the current object for each column in the array.

If you want to do a case insensitive uniqueness validation on a database that is case sensitive by default, you can use:

validates_unique :column, where:(lambda do |ds, obj, cols|
  ds.where(cols.map do |c|
    v = obj.public_send(c)
    v = v.downcase if v
    [Sequel.function(:lower, c), v]
  end)
end)

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# File 'lib/sequel/plugins/validation_helpers.rb', line 245

def validates_unique(*atts)
  opts = default_validation_helpers_options(:unique)
  if atts.last.is_a?(Hash)
    opts = opts.merge(atts.pop)
  end
  message = validation_error_message(opts[:message])
  from_values = opts[:from] == :values
  where = opts[:where]
  atts.each do |a|
    arr = Array(a)
    next if arr.any?{|x| errors.on(x)}
    cc = changed_columns
    next if opts.fetch(:only_if_modified, true) && !new? && !arr.any?{|x| cc.include?(x)}
    ds = opts[:dataset] || model.dataset
    ds = if where
      where.call(ds, self, arr)
    else
      vals = arr.map{|x| from_values ? values[x] : get_column_value(x)}
      next if vals.any?(&:nil?)
      ds.where(arr.zip(vals))
    end
    ds = yield(ds) if block_given?
    unless new?
      h = ds.joined_dataset? ? qualified_pk_hash : pk_hash
      ds = ds.exclude(h)
    end
    errors.add(a, message) unless ds.count == 0
  end
end