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Validate lengths of string attributes
When using the MySQL database, Rails automatically sets a limit of 255 characters for string columns. This changes ensures this limit is also enforced in the validations. For several columns with a different limit, that different limit is enforced instead. For the PostgreSQL database, there is no limit in the database, but it is useful to set a limit anyway to prevent absurdly large values from being submitted.
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,17 @@ | ||
# frozen_string_literal: true | ||
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module StringLengthLimit | ||
# Default string length limit for model attributes. When running on MySQL, | ||
# this is equal to the default string length in the database as set by Rails. | ||
STRING_LIMIT = 255 | ||
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extend ActiveSupport::Concern | ||
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class_methods do | ||
def validates_default_string_length(*names) | ||
names.each do |name| | ||
validates name, length: { maximum: STRING_LIMIT } | ||
end | ||
end | ||
end | ||
end |
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Original file line number | Diff line number | Diff line change |
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@@ -1,5 +1,8 @@ | ||
# frozen_string_literal: true | ||
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class Ping < ApplicationRecord | ||
include StringLengthLimit | ||
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belongs_to :article | ||
validates_default_string_length :url | ||
end |
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