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ArgumentError for invalid :limit & :precision Rails 6

This blog is part of our Rails 6 series.

Rails 6.0 was recently released.

Rails 6 raises ArgumentError when :limit and :precision are used with invalid datatypes.

Before Rails 6, it used to return ActiveRecord::ActiveRecordError.

Let's checkout how it works.

Rails 5.2

Let's create an orders table and try using :limit with a column named as quantity with data type integer.

1
2> > class CreateOrders < ActiveRecord::Migration[5.2]
3> > def change
4> > create_table :orders do |t|
5> > t.string :item
6> > t.integer :quantity, limit: 10
7> >
8> >       t.timestamps
9> >     end
10> >
11> > end
12> > end
13
14=> :change
15
16> > CreateOrders.new.change
17> > -- create_table(:orders)
18
19=> Traceback (most recent call last):
202: from (irb):11
211: from (irb):3:in 'change'
22ActiveRecord::ActiveRecordError (No integer type has byte size 10. Use a numeric with scale 0 instead.)

We can see that use of :limit with integer column raises ActiveRecord::ActiveRecordError in Rails 5.2.

Now let's try using :precision of 10 with a datetime column.

1
2> > class CreateOrders < ActiveRecord::Migration[5.2]
3> > def change
4> > create_table :orders do |t|
5> > t.string :item
6> > t.integer :quantity
7> > t.datetime :completed_at, precision: 10
8> >
9> >       t.timestamps
10> >     end
11> >
12> > end
13> > end
14
15=> :change
16
17> > CreateOrders.new.change
18> > -- create_table(:orders)
19
20=> Traceback (most recent call last):
212: from (irb):12
221: from (irb):3:in 'change'
23ActiveRecord::ActiveRecordError (No timestamp type has precision of 10. The allowed range of precision is from 0 to 6)

We can see that invalid value of :precision with datetime column also raises ActiveRecord::ActiveRecordError in Rails 5.2.

Rails 6.0.0.rc1

Let's create an orders table and try using :limit with a column named as quantity with data type integer in Rails 6.

1
2> > class CreateOrders < ActiveRecord::Migration[6.0]
3> > def change
4> > create_table :orders do |t|
5> > t.string :item
6> > t.integer :quantity, limit: 10
7> >
8> >       t.timestamps
9> >     end
10> >
11> > end
12> > end
13
14=> :change
15
16> > CreateOrders.new.change
17> > -- create_table(:orders)
18
19=> Traceback (most recent call last):
202: from (irb):11
211: from (irb):3:in 'change'
22ArgumentError (No integer type has byte size 10. Use a numeric with scale 0 instead.)

We can see that use of :limit with integer column raises ArgumentError in Rails 6.

Now let's try using :precision of 10 with a datetime column.

1
2> > class CreateOrders < ActiveRecord::Migration[6.0]
3> > def change
4> > create_table :orders do |t|
5> > t.string :item
6> > t.integer :quantity
7> > t.datetime :completed_at, precision: 10
8> >
9> >       t.timestamps
10> >     end
11> >
12> > end
13> > end
14
15=> :change
16
17> > CreateOrders.new.change
18> > -- create_table(:orders)
19
20=> Traceback (most recent call last):
212: from (irb):12
221: from (irb):3:in 'change'
23ArgumentError (No timestamp type has precision of 10. The allowed range of precision is from 0 to 6)

We can see that invalid value of :precision with datetime column also raises ArgumentError in Rails 6.

Here is the relevant pull request.

Amit Choudhary in Rails 6
August 27, 2019
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