Class: ActiveRecord::ConnectionAdapters::Table
- Inherits:
-
Object
- Object
- ActiveRecord::ConnectionAdapters::Table
- Defined in:
- lib/active_record/connection_adapters/abstract/schema_definitions.rb
Overview
Represents an SQL table in an abstract way for updating a table. Also see TableDefinition and SchemaStatements#create_table
Available transformations are:
change_table :table do |t|
t.column
t.index
t.rename_index
t.
t.change
t.change_default
t.rename
t.references
t.belongs_to
t.string
t.text
t.integer
t.float
t.decimal
t.datetime
t.
t.time
t.date
t.binary
t.boolean
t.remove
t.remove_references
t.remove_belongs_to
t.remove_index
t.
end
Direct Known Subclasses
Instance Attribute Summary collapse
-
#name ⇒ Object
readonly
Returns the value of attribute name.
Instance Method Summary collapse
-
#change(column_name, type, options = {}) ⇒ Object
Changes the column’s definition according to the new options.
-
#change_default(column_name, default) ⇒ Object
Sets a new default value for a column.
-
#column(column_name, type, options = {}) ⇒ Object
Adds a new column to the named table.
-
#column_exists?(column_name, type = nil, options = {}) ⇒ Boolean
Checks to see if a column exists.
-
#index(column_name, options = {}) ⇒ Object
Adds a new index to the table.
-
#index_exists?(column_name, options = {}) ⇒ Boolean
Checks to see if an index exists.
-
#initialize(table_name, base) ⇒ Table
constructor
A new instance of Table.
-
#references(*args) ⇒ Object
(also: #belongs_to)
Adds a reference.
-
#remove(*column_names) ⇒ Object
Removes the column(s) from the table definition.
-
#remove_index(options = {}) ⇒ Object
Removes the given index from the table.
-
#remove_references(*args) ⇒ Object
(also: #remove_belongs_to)
Removes a reference.
-
#remove_timestamps(options = {}) ⇒ Object
Removes the timestamp columns (
created_at
andupdated_at
) from the table. -
#rename(column_name, new_column_name) ⇒ Object
Renames a column.
-
#rename_index(index_name, new_index_name) ⇒ Object
Renames the given index on the table.
-
#timestamps(options = {}) ⇒ Object
Adds timestamps (
created_at
andupdated_at
) columns to the table.
Constructor Details
#initialize(table_name, base) ⇒ Table
Returns a new instance of Table.
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# File 'lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 419 def initialize(table_name, base) @name = table_name @base = base end |
Instance Attribute Details
#name ⇒ Object (readonly)
Returns the value of attribute name.
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# File 'lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 417 def name @name end |
Instance Method Details
#change(column_name, type, options = {}) ⇒ Object
Changes the column’s definition according to the new options. See TableDefinition#column for details of the options you can use.
t.change(:name, :string, limit: 80)
t.change(:description, :text)
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# File 'lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 475 def change(column_name, type, = {}) @base.change_column(name, column_name, type, ) end |
#change_default(column_name, default) ⇒ Object
Sets a new default value for a column. See SchemaStatements#change_column_default
t.change_default(:qualification, 'new')
t.change_default(:authorized, 1)
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# File 'lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 483 def change_default(column_name, default) @base.change_column_default(name, column_name, default) end |
#column(column_name, type, options = {}) ⇒ Object
Adds a new column to the named table. See TableDefinition#column for details of the options you can use.
Creating a simple column
t.column(:name, :string)
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# File 'lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 429 def column(column_name, type, = {}) @base.add_column(name, column_name, type, ) end |
#column_exists?(column_name, type = nil, options = {}) ⇒ Boolean
Checks to see if a column exists. See SchemaStatements#column_exists?
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# File 'lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 434 def column_exists?(column_name, type = nil, = {}) @base.column_exists?(name, column_name, type, ) end |
#index(column_name, options = {}) ⇒ Object
Adds a new index to the table. column_name
can be a single Symbol, or an Array of Symbols. See SchemaStatements#add_index
Creating a simple index
t.index(:name)
Creating a unique index
t.index([:branch_id, :party_id], unique: true)
Creating a named index
t.index([:branch_id, :party_id], unique: true, name: 'by_branch_party')
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# File 'lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 447 def index(column_name, = {}) @base.add_index(name, column_name, ) end |
#index_exists?(column_name, options = {}) ⇒ Boolean
Checks to see if an index exists. See SchemaStatements#index_exists?
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# File 'lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 452 def index_exists?(column_name, = {}) @base.index_exists?(name, column_name, ) end |
#references(*args) ⇒ Object Also known as: belongs_to
Adds a reference. Optionally adds a type
column, if :polymorphic
option is provided. references
and belongs_to
are acceptable. The reference column will be an integer
by default, the :type
option can be used to specify a different type.
t.references(:user)
t.references(:user, type: "string")
t.belongs_to(:supplier, polymorphic: true)
See SchemaStatements#add_reference
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# File 'lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 532 def references(*args) = args. args.each do |ref_name| @base.add_reference(name, ref_name, ) end end |
#remove(*column_names) ⇒ Object
Removes the column(s) from the table definition.
t.remove(:qualification)
t.remove(:qualification, :experience)
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# File 'lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 491 def remove(*column_names) @base.remove_columns(name, *column_names) end |
#remove_index(options = {}) ⇒ Object
Removes the given index from the table.
Remove the index_table_name_on_column in the table_name table
t.remove_index :column
Remove the index named index_table_name_on_branch_id in the table_name table
t.remove_index column: :branch_id
Remove the index named index_table_name_on_branch_id_and_party_id in the table_name table
t.remove_index column: [:branch_id, :party_id]
Remove the index named by_branch_party in the table_name table
t.remove_index name: :by_branch_party
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# File 'lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 505 def remove_index( = {}) @base.remove_index(name, ) end |
#remove_references(*args) ⇒ Object Also known as: remove_belongs_to
Removes a reference. Optionally removes a type
column. remove_references
and remove_belongs_to
are acceptable.
t.remove_references(:user)
t.remove_belongs_to(:supplier, polymorphic: true)
See SchemaStatements#remove_reference
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# File 'lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 547 def remove_references(*args) = args. args.each do |ref_name| @base.remove_reference(name, ref_name, ) end end |
#remove_timestamps(options = {}) ⇒ Object
Removes the timestamp columns (created_at
and updated_at
) from the table.
t.
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# File 'lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 512 def ( = {}) @base.(name, ) end |
#rename(column_name, new_column_name) ⇒ Object
Renames a column.
t.rename(:description, :name)
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# File 'lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 519 def rename(column_name, new_column_name) @base.rename_column(name, column_name, new_column_name) end |
#rename_index(index_name, new_index_name) ⇒ Object
Renames the given index on the table.
t.rename_index(:user_id, :account_id)
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# File 'lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 459 def rename_index(index_name, new_index_name) @base.rename_index(name, index_name, new_index_name) end |
#timestamps(options = {}) ⇒ Object
Adds timestamps (created_at
and updated_at
) columns to the table. See SchemaStatements#add_timestamps
t. null: false
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# File 'lib/active_record/connection_adapters/abstract/schema_definitions.rb', line 466 def ( = {}) @base.(name, ) end |