dda5f71124
Add warning about MySQL collation Fix database index length This allows new databases to be created with utf8mb4, on MySQL. The maximum column size is 767 bytes. Each character is 4 bytes long -> 767 / 4 = 191 characters for the column.
40 lines
1.2 KiB
Ruby
40 lines
1.2 KiB
Ruby
class SetMysqlToUnicodeMb4 < ActiveRecord::Migration
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UTF8_PAIRS = {}
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tables = ActiveRecord::Base.connection.tables
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tables.each do |table|
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ActiveRecord::Base.connection.columns(table).each do |column|
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# build a hash with all the columns that contain text
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UTF8_PAIRS[table] = column.name if (column.type == :string) || (column.type == :text)
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end
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end
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def self.up
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if AppConfig.mysql?
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execute "ALTER DATABASE `#{ActiveRecord::Base.connection.current_database}` CHARACTER SET utf8mb4;"
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tables.each do |table|
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execute "ALTER TABLE `#{table}` CHARACTER SET = utf8mb4;"
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end
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UTF8_PAIRS.each do |table, col|
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execute "ALTER TABLE `#{table}` CHANGE `#{col}` `#{col}` TEXT CHARACTER SET utf8mb4 NULL;"
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end
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end
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end
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def self.down
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if AppConfig.mysql?
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execute "ALTER DATABASE `#{ActiveRecord::Base.connection.current_database}` CHARACTER SET utf8;"
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tables.each do |table|
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execute "ALTER TABLE `#{table}` CHARACTER SET = utf8;"
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end
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UTF8_PAIRS.each do |table, col|
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execute "ALTER TABLE `#{table}` CHANGE `#{col}` `#{col}` TEXT CHARACTER SET utf8 NULL;"
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end
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end
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end
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end
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