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.



97
98
99
 
# File 'lib/sequel/plugins/validation_helpers.rb', line 97

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.



102
103
104
 
# File 'lib/sequel/plugins/validation_helpers.rb', line 102

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.



107
108
109
 
# File 'lib/sequel/plugins/validation_helpers.rb', line 107

def validates_includes(set, atts, opts=OPTS)
  validatable_attributes_for_type(:includes, atts, opts){|a,v,m| validation_error_message(m, set) unless set.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.



112
113
114
115
116
117
118
119
120
121
 
# File 'lib/sequel/plugins/validation_helpers.rb', line 112

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.



124
125
126
 
# File 'lib/sequel/plugins/validation_helpers.rb', line 124

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.send(range.respond_to?(:cover?) ? :cover? : :include?, 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.



132
133
134
 
# File 'lib/sequel/plugins/validation_helpers.rb', line 132

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

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

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



137
138
139
 
# File 'lib/sequel/plugins/validation_helpers.rb', line 137

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.



142
143
144
 
# File 'lib/sequel/plugins/validation_helpers.rb', line 142

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.



147
148
149
150
151
152
153
154
155
156
 
# File 'lib/sequel/plugins/validation_helpers.rb', line 147

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_presence(atts, opts = OPTS) ⇒ Object

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



181
182
183
 
# File 'lib/sequel/plugins/validation_helpers.rb', line 181

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.



161
162
163
164
165
166
167
 
# File 'lib/sequel/plugins/validation_helpers.rb', line 161

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.



171
172
173
174
175
176
177
178
 
# File 'lib/sequel/plugins/validation_helpers.rb', line 171

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.filter(: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.

: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=>(proc do |ds, obj, cols|
  ds.where(cols.map do |c|
    v = obj.send(c)
    v = v.downcase if v
    [Sequel.function(:lower, c), v]
  end)
end)



229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
 
# File 'lib/sequel/plugins/validation_helpers.rb', line 229

def validates_unique(*atts)
  opts = default_validation_helpers_options(:unique)
  if atts.last.is_a?(Hash)
    opts = Hash[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)}
    next if opts[:only_if_modified] && !new? && !arr.any?{|x| changed_columns.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