instance method `column_exists?`

Ruby on Rails 4.0.13

Since v3.0.20

Available in: v3.0.20 v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

column_exists?(table_name, column_name, type = nil, options = {})

Checks to see if a column exists in a given table.

# Check a column exists
column_exists?(:suppliers, :name)

# Check a column exists of a particular type
column_exists?(:suppliers, :name, :string)

# Check a column exists with a specific definition
column_exists?(:suppliers, :name, :string, limit: 100)
column_exists?(:suppliers, :name, :string, default: 'default')
column_exists?(:suppliers, :name, :string, null: false)
column_exists?(:suppliers, :tax, :decimal, precision: 8, scale: 2)

Parameters

table_name req
column_name req
type opt = nil
options opt = {}

Source

# File activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb, line 73
      def column_exists?(table_name, column_name, type = nil, options = {})
        columns(table_name).any?{ |c| c.name == column_name.to_s &&
                                      (!type                     || c.type == type) &&
                                      (!options.key?(:limit)     || c.limit == options[:limit]) &&
                                      (!options.key?(:precision) || c.precision == options[:precision]) &&
                                      (!options.key?(:scale)     || c.scale == options[:scale]) &&
                                      (!options.key?(:default)   || c.default == options[:default]) &&
                                      (!options.key?(:null)      || c.null == options[:null]) }
      end

Defined in activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb line 73 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveRecord::ConnectionAdapters::SchemaStatements

Signature

Parameters