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Support case-insensitive uniqueness validations under MySQL #39

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Support case-insensitive uniqueness validations under MySQL #39

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316f6f3
Fix case-insensitivity uniqueness validation for MySQL.
dmeranda Apr 19, 2016
89f54f0
Only call the column's case_sensitive? if it is determined by the col…
dmeranda Apr 19, 2016
ac3ed28
Readme should mention schema_plus_pg_indexes only needed for PostgreSQL.
dmeranda Apr 19, 2016
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2 changes: 1 addition & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -62,7 +62,7 @@ Constraints:
| `null: false` | `validates ... presence: true` |
| `limit: 100` | `validates ... length: { maximum: 100 }` |
| `unique: true` | `validates ... uniqueness: true` |
| `unique: true, case_sensitive: false` <br>(If [schema_plus_pg_indexes](https://github.com/SchemaPlus/schema_plus_pg_indexes) is also in use) | `validates ... uniqueness: { case_sensitive: false }` |
| `unique: true, case_sensitive: false` <br>(Requires [schema_plus_pg_indexes](https://github.com/SchemaPlus/schema_plus_pg_indexes) for PostgreSQL) | `validates ... uniqueness: { case_sensitive: false }` |

Data types:

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6 changes: 5 additions & 1 deletion lib/schema_validations/active_record/validations.rb
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Expand Up @@ -169,7 +169,7 @@ def add_uniqueness_validation(column) #:nodoc:
options = {}
options[:scope] = scope if scope.any?
options[:allow_nil] = true
options[:case_sensitive] = false if has_case_insensitive_index?(column, scope)
options[:case_sensitive] = false if column_is_case_insensitive?(column) or has_case_insensitive_index?(column, scope)
options[:if] = (proc do |record|
if scope.all? { |scope_sym| record.public_send(:"#{scope_sym}?") }
record.public_send(:"#{column.name}_changed?")
Expand All @@ -181,6 +181,10 @@ def add_uniqueness_validation(column) #:nodoc:
validate_logged :validates_uniqueness_of, name, options
end

def column_is_case_insensitive?(column)
column.respond_to?(:collation) && column.respond_to?(:case_sensitive?) && ! column.case_sensitive?
end

def has_case_insensitive_index?(column, scope)
indexed_columns = (scope + [column.name]).map(&:to_sym).sort
index = column.indexes.select { |i| i.unique && i.columns.map(&:to_sym).sort == indexed_columns }.first
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