Add `:charset` and `:collation` options support for MySQL string and text columns

Example:

    create_table :foos do |t|
      t.string :string_utf8_bin, charset: 'utf8', collation: 'utf8_bin'
      t.text   :text_ascii,      charset: 'ascii'
    end

1 files changed, 54 insertions, 0 deletions

diff --git a/activerecord/test/cases/adapters/mysql/charset_collation_test.rb b/activerecord/test/cases/adapters/mysql/charset_collation_test.rb
new file mode 100644
index 0000000000..71a3756a90
--- /dev/null
+++ b/activerecord/test/cases/adapters/mysql/charset_collation_test.rb
@@ -0,0 +1,54 @@
+require "cases/helper"
+require 'support/schema_dumping_helper'
+
+class CharsetCollationTest < ActiveRecord::TestCase
+  include SchemaDumpingHelper
+  self.use_transactional_fixtures = false
+
+  setup do
+    @connection = ActiveRecord::Base.connection
+    @connection.create_table :charset_collations, force: true do |t|
+      t.string :string_ascii_bin, charset: 'ascii', collation: 'ascii_bin'
+      t.text :text_ucs2_unicode_ci, charset: 'ucs2', collation: 'ucs2_unicode_ci'
+    end
+  end
+
+  teardown do
+    @connection.drop_table :charset_collations, if_exists: true
+  end
+
+  test "string column with charset and collation" do
+    column = @connection.columns(:charset_collations).find { |c| c.name == 'string_ascii_bin' }
+    assert_equal :string, column.type
+    assert_equal 'ascii_bin', column.collation
+  end
+
+  test "text column with charset and collation" do
+    column = @connection.columns(:charset_collations).find { |c| c.name == 'text_ucs2_unicode_ci' }
+    assert_equal :text, column.type
+    assert_equal 'ucs2_unicode_ci', column.collation
+  end
+
+  test "add column with charset and collation" do
+    @connection.add_column :charset_collations, :title, :string, charset: 'utf8', collation: 'utf8_bin'
+
+    column = @connection.columns(:charset_collations).find { |c| c.name == 'title' }
+    assert_equal :string, column.type
+    assert_equal 'utf8_bin', column.collation
+  end
+
+  test "change column with charset and collation" do
+    @connection.add_column :charset_collations, :description, :string, charset: 'utf8', collation: 'utf8_unicode_ci'
+    @connection.change_column :charset_collations, :description, :text, charset: 'utf8', collation: 'utf8_general_ci'
+
+    column = @connection.columns(:charset_collations).find { |c| c.name == 'description' }
+    assert_equal :text, column.type
+    assert_equal 'utf8_general_ci', column.collation
+  end
+
+  test "schema dump includes collation" do
+    output = dump_table_schema("charset_collations")
+    assert_match %r{t.string\s+"string_ascii_bin",\s+limit: 255,\s+collation: "ascii_bin"$}, output
+    assert_match %r{t.text\s+"text_ucs2_unicode_ci",\s+limit: 65535,\s+collation: "ucs2_unicode_ci"$}, output
+  end
+end