### Home Classes Methods

### In Files

- lib/sequel/database/schema_generator.rb

### Parent

Object

### Methods

- ::new
- #add_column
- #add_constraint
- #add_foreign_key
- #add_full_text_index
- #add_index
- #add_primary_key
- #add_spatial_index
- #add_unique_constraint
- #drop_column
- #drop_constraint
- #drop_index
- #rename_column
- #set_column_allow_null
- #set_column_default
- #set_column_type

### Files

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No matching classes.

# Sequel::Schema::AlterTableGenerator

Schema::AlterTableGenerator is an internal class that the user is not expected to instantiate directly. Instances are created by Database#alter_table. It is used to specify table alteration parameters. It takes a Database object and a block of operations to perform on the table, and gives the Database a table an array of operations, which the database uses to alter a table's description.

For more information on Sequel’s support for schema modification, see the “Migrations and Schema Modification” guide.

### Attributes

operations[R]

An array of DDL operations to perform

### Public Class Methods

new(db, &block) click to toggle source

Set the Database object to which to apply the DDL, and evaluate the block in the context of this object.

    # File lib/sequel/database/schema_generator.rb, line 219
    def initialize(db, &block)
      @db = db
      @operations = []
      instance_eval(&block) if block
    end

### Public Instance Methods

add_column(name, type, opts = {}) click to toggle source

Add a column with the given name, type, and opts to the DDL for the table. See Generator#column for the available options.

    # File lib/sequel/database/schema_generator.rb, line 227
    def add_column(name, type, opts = {})
      @operations << {:op => :add_column, :name => name, :type => type}.merge(opts)
    end

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

Add a constraint with the given name and args to the DDL for the table. See Generator#constraint.

    # File lib/sequel/database/schema_generator.rb, line 233
    def add_constraint(name, *args, &block)
      @operations << {:op => :add_constraint, :name => name, :type => :check, :check => block || args}
    end

add_foreign_key(name, table, opts = {}) click to toggle source

Add a foreign key with the given name and referencing the given table to the DDL for the table. See Generator#column for the available options.

You can also pass an array of column names for creating composite foreign keys. In this case, it will assume the columns exists and will only add the constraint.

NOTE: If you need to add a foreign key constraint to an existing column use the composite key syntax even if it is only one column.

    # File lib/sequel/database/schema_generator.rb, line 251
    def add_foreign_key(name, table, opts = {})
      return add_composite_foreign_key(name, table, opts) if name.is_a?(Array)
      add_column(name, Integer, {:table=>table}.merge(opts))
    end

add_full_text_index(columns, opts = {}) click to toggle source

Add a full text index on the given columns to the DDL for the table. See Generator#index for available options.

    # File lib/sequel/database/schema_generator.rb, line 258
    def add_full_text_index(columns, opts = {})
      add_index(columns, {:type=>:full_text}.merge(opts))
    end

add_index(columns, opts = {}) click to toggle source

Add an index on the given columns to the DDL for the table. See Generator#index for available options.

    # File lib/sequel/database/schema_generator.rb, line 264
    def add_index(columns, opts = {})
      @operations << {:op => :add_index, :columns => Array(columns)}.merge(opts)
    end

add_primary_key(name, opts = {}) click to toggle source

Add a primary key to the DDL for the table. See Generator#column for the available options.

    # File lib/sequel/database/schema_generator.rb, line 270
    def add_primary_key(name, opts = {})
      return add_composite_primary_key(name, opts) if name.is_a?(Array)
      opts = @db.serial_primary_key_options.merge(opts)
      add_column(name, opts.delete(:type), opts)
    end

add_spatial_index(columns, opts = {}) click to toggle source

Add a spatial index on the given columns to the DDL for the table. See Generator#index for available options.

    # File lib/sequel/database/schema_generator.rb, line 278
    def add_spatial_index(columns, opts = {})
      add_index(columns, {:type=>:spatial}.merge(opts))
    end

add_unique_constraint(columns, opts = {}) click to toggle source

Add a unique constraint to the given column(s)

    # File lib/sequel/database/schema_generator.rb, line 238
    def add_unique_constraint(columns, opts = {})
      @operations << {:op => :add_constraint, :type => :unique, :columns => Array(columns)}.merge(opts)
    end

drop_column(name) click to toggle source

Remove a column from the DDL for the table.

    # File lib/sequel/database/schema_generator.rb, line 283
    def drop_column(name)
      @operations << {:op => :drop_column, :name => name}
    end

drop_constraint(name) click to toggle source

Remove a constraint from the DDL for the table.

    # File lib/sequel/database/schema_generator.rb, line 288
    def drop_constraint(name)
      @operations << {:op => :drop_constraint, :name => name}
    end

drop_index(columns, options={}) click to toggle source

Remove an index from the DDL for the table.

    # File lib/sequel/database/schema_generator.rb, line 293
    def drop_index(columns, options={})
      @operations << {:op => :drop_index, :columns => Array(columns)}.merge(options)
    end

rename_column(name, new_name, opts = {}) click to toggle source

Modify a column’s name in the DDL for the table.

    # File lib/sequel/database/schema_generator.rb, line 298
    def rename_column(name, new_name, opts = {})
      @operations << {:op => :rename_column, :name => name, :new_name => new_name}.merge(opts)
    end

set_column_allow_null(name, allow_null) click to toggle source

Modify a column’s NOT NULL constraint.

    # File lib/sequel/database/schema_generator.rb, line 313
    def set_column_allow_null(name, allow_null)
      @operations << {:op => :set_column_null, :name => name, :null => allow_null}
    end

set_column_default(name, default) click to toggle source

Modify a column’s default value in the DDL for the table.

    # File lib/sequel/database/schema_generator.rb, line 303
    def set_column_default(name, default)
      @operations << {:op => :set_column_default, :name => name, :default => default}
    end

set_column_type(name, type, opts={}) click to toggle source

Modify a column’s type in the DDL for the table.

    # File lib/sequel/database/schema_generator.rb, line 308
    def set_column_type(name, type, opts={})
      @operations << {:op => :set_column_type, :name => name, :type => type}.merge(opts)
    end

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