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

### Home Classes Methods

### In Files

- lib/sequel/plugins/validation_helpers.rb

### Methods

- #validates_exact_length
- #validates_format
- #validates_includes
- #validates_integer
- #validates_length_range
- #validates_max_length
- #validates_min_length
- #validates_not_string
- #validates_numeric
- #validates_presence
- #validates_type
- #validates_unique

### Files

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- sql.rdoc
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No matching classes.

# Sequel::Plugins::ValidationHelpers::InstanceMethods

### Public Instance Methods

validates_exact_length(exact, atts, opts={}) click to toggle source

Check that the attribute values are the given exact length.

    # File lib/sequel/plugins/validation_helpers.rb, line 64
    def validates_exact_length(exact, atts, opts={})
      validatable_attributes_for_type(:exact_length, atts, opts){|a,v,m| validation_error_message(m, exact) unless v && v.length == exact}
    end

validates_format(with, atts, opts={}) click to toggle source

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

    # File lib/sequel/plugins/validation_helpers.rb, line 69
    def validates_format(with, atts, 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={}) click to toggle source

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

    # File lib/sequel/plugins/validation_helpers.rb, line 74
    def validates_includes(set, atts, opts={})
      validatable_attributes_for_type(:includes, atts, opts){|a,v,m| validation_error_message(m, set) unless set.include?(v)}
    end

validates_integer(atts, opts={}) click to toggle source

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

    # File lib/sequel/plugins/validation_helpers.rb, line 79
    def validates_integer(atts, 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={}) click to toggle source

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

    # File lib/sequel/plugins/validation_helpers.rb, line 91
    def validates_length_range(range, atts, opts={})
      validatable_attributes_for_type(:length_range, atts, opts){|a,v,m| validation_error_message(m, range) unless v && range.include?(v.length)}
    end

validates_max_length(max, atts, opts={}) click to toggle source

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

    # File lib/sequel/plugins/validation_helpers.rb, line 96
    def validates_max_length(max, atts, opts={})
      validatable_attributes_for_type(:max_length, atts, opts){|a,v,m| validation_error_message(m, max) unless v && v.length <= max}
    end

validates_min_length(min, atts, opts={}) click to toggle source

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

    # File lib/sequel/plugins/validation_helpers.rb, line 101
    def validates_min_length(min, atts, opts={})
      validatable_attributes_for_type(:min_length, atts, opts){|a,v,m| validation_error_message(m, min) unless v && v.length >= min}
    end

validates_not_string(atts, opts={}) click to toggle source

Check that the attribute value(s) is not a string. This is generally useful in conjunction with raise_on_typecast_failure = false, where you are passing in string values for non-string attributes (such as numbers and dates). If typecasting fails (invalid number or date), the value of the attribute will be a string in an invalid format, and if typecasting succeeds, the value will not be a string.

    # File lib/sequel/plugins/validation_helpers.rb, line 111
    def validates_not_string(atts, opts={})
      validatable_attributes_for_type(:not_string, atts, opts){|a,v,m| validation_error_message(m, (db_schema[a]||{})[:type]) if v.is_a?(String)}
    end

validates_numeric(atts, opts={}) click to toggle source

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

    # File lib/sequel/plugins/validation_helpers.rb, line 116
    def validates_numeric(atts, 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={}) click to toggle source

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

    # File lib/sequel/plugins/validation_helpers.rb, line 134
    def validates_presence(atts, 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_type(klass, atts, opts={}) click to toggle source

Check if value is an instance of a class

    # File lib/sequel/plugins/validation_helpers.rb, line 128
    def validates_type(klass, atts, opts={})
      klass = klass.to_s.constantize if klass.is_a?(String) || klass.is_a?(Symbol)
      validatable_attributes_for_type(:type, atts, opts){|a,v,m| validation_error_message(m, klass) if v && !v.is_a?(klass)}
    end

validates_unique(*atts) click to toggle source

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:

- :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.

    # File lib/sequel/plugins/validation_helpers.rb, line 165
    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])
      atts.each do |a|
        arr = Array(a)
        next if opts[:only_if_modified] && !new? && !arr.any?{|x| changed_columns.include?(x)}
        ds = model.filter(arr.map{|x| [x, send(x)]})
        ds = yield(ds) if block_given?
        ds = ds.exclude(pk_hash) unless new?
        errors.add(a, message) unless ds.count == 0
      end
    end

[Validate]

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