From 7cd922d2a52cd5b55db47cb8bb114f387d93bdee Mon Sep 17 00:00:00 2001
From: Alexey Shiklomanov <ashiklom@bu.edu>
Date: Wed, 7 Feb 2018 14:47:23 -0600
Subject: [PATCH] MIGRATION: Relax constraints on citations table

- Change `citations.title` and `citations.journal` columns to unlimited variable width `text` type.
- Remove format constraint on `citations.pg`.
---
 db/migrate/20180206152600_relax_citations.rb | 25 ++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 db/migrate/20180206152600_relax_citations.rb

diff --git a/db/migrate/20180206152600_relax_citations.rb b/db/migrate/20180206152600_relax_citations.rb
new file mode 100644
index 000000000..0468af612
--- /dev/null
+++ b/db/migrate/20180206152600_relax_citations.rb
@@ -0,0 +1,25 @@
+class RelaxCitations < ActiveRecord::Migration
+  def self.up
+  	# Use longer "text" field
+  	change_column :citations, :title, :text
+  	change_column :citations, :journal, :text
+    add_column :citations, :notes, :text
+
+    # This constraint is draconian and totally unnecessary.
+    # Other metadata should be plenty sufficient without well-formed page number
+    execute %q{
+        ALTER TABLE citations
+            DROP CONSTRAINT well_formed_citation_page_spec;
+    }
+  end
+
+  def self.down
+  	change_column :citations, :title, :string
+  	change_column :citations, :journal, :string
+    remove_column :citations, :notes, :text
+    execute %q{
+        ALTER TABLE citations
+            ADD CONSTRAINT well_formed_citation_page_spec CHECK (pg ~ '^([1-9]\d*(\u2013[1-9]\d*)?)?$');
+    }
+  end
+end